IDEXX LABORATORIES INC /DE
10-K, 2000-03-29
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                    FORM 10-K

[X]    ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
       ACT OF 1934
       For The Fiscal Year Ended December 31, 1999

                                       OR

[ ]    TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
       EXCHANGE ACT OF 1934
       For The Transition Period From __________To __________.

                         COMMISSION FILE NUMBER 0-19271
                            IDEXX LABORATORIES, INC.
             (Exact name of registrant as specified in its charter)

<TABLE>
<S>                                                                           <C>
                           DELAWARE                                           01-0393723
(State or other jurisdiction of incorporation or organization)   (I.R.S. Employer Identification No.)

             ONE IDEXX DRIVE, WESTBROOK, MAINE                                  04092
           (Address of principal executive offices)                           (Zip Code)
</TABLE>

                                 (207) 856-0300
              (Registrant's telephone number, including area code)

           SECURITIES REGISTERED PURSUANT TO SECTION 12(b) OF THE ACT:
                                      NONE

           SECURITIES REGISTERED PURSUANT TO SECTION 12(g) OF THE ACT:
                     Common Stock, $0.10 par value per share
                         Preferred Stock Purchase Rights
                                (Title of Class)

    Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days. Yes [X] No [ ]

    Indicate by check mark if disclosure of delinquent filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's knowledge, in definitive proxy or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. [ ]

    Based on the closing sale price on March 23, 2000, the aggregate market
value of the voting stock held by non-affiliates of the registrant was
$938,916,009. For these purposes, the registrant considers all of its Directors
and executive officers and The Jackson Laboratory to be its only affiliates.

    The number of shares outstanding of the registrant's Common Stock was
35,425,859 on March 23, 2000.

                       DOCUMENTS INCORPORATED BY REFERENCE

   LOCATION IN FORM 10-K                    INCORPORATED DOCUMENT
          Part III            Specifically identified portions of the Company's
                              definitive proxy statement to be filed in
                              connection with the Company's Annual Meeting to be
                              held on May 17, 2000 are incorporated herein by
                              reference.

       Parts I and II         Specifically identified portions of the Company's
                              Annual Report to Stockholders for the year ended
                              December 31, 1999 are incorporated herein by
                              reference.


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Forward-looking statements, within the meaning of Section 21E of the Securities
Exchange Act of 1934, as amended, are made throughout this Annual Report on Form
10-K. For this purpose, any statements contained herein that are not statements
of historical fact may be deemed to be forward-looking statements. Without
limiting the foregoing, the words "believes," "anticipates," "plans," "expects,"
"seeks," "estimates," and similar expressions are intended to identify
forward-looking statements. There are a number of important factors that could
cause the results of the Company to differ materially from those indicated by
such forward-looking statements, including those detailed under the caption
"Management's Discussion and Analysis of Financial Condition and Results of
Operations - Future Operating Results" in the Company's 1999 Annual Report to
Stockholders incorporated herein by reference.

- --------------------------------------------------------------------------------
ITEM 1.   BUSINESS

    IDEXX Laboratories, Inc., incorporated in Delaware in 1983 (the "Company" or
("IDEXX") which includes wholly-owned subsidiaries unless the context otherwise
requires), develops, manufactures and distributes products and provides services
for veterinary, food and environmental markets. Within these markets, the
Company's products and services include biology-based detection systems,
chemistry-based detection systems, laboratory testing and specialized consulting
services, veterinary practice information management software systems and
related services, a veterinary Internet portal/application service provider and
pharmaceutical products. The substantial majority of the Company's revenue is
currently derived from the sale of veterinary diagnostic products and services
and veterinary practice information management systems and services, where the
Company believes it holds leading market positions. The Company's veterinary
diagnostic products are used by veterinarians to detect and monitor diseases,
physiologic disorders, immune status, hormone and enzyme levels, blood
chemistry, electrolyte levels, blood cell counts and other substances or
conditions in animals. The Company's software products are designed to provide
comprehensive information management solutions for veterinary clinics. The
veterinary laboratory testing and consultation services provided by the Company
are used by veterinarians to assist them in the detection and diagnosis of
disease status and other conditions in animals. The Company is also developing
products for veterinary therapeutic applications. The Company's food and
environmental products include water testing products that detect microbial
contaminants in water, dairy testing products that detect antibiotic residues in
milk and diagnostic products that assist in disease detection, management and
eradication in food production animals.

    The Company has developed leading positions in many of its markets by
identifying user needs and offering high-quality, cost-effective product and
service solutions backed by extensive customer support. The Company's test
products incorporate a range of delivery systems and detection technologies
which are tailored to particular applications and customer needs. Through its
1997 acquisitions of Advanced Veterinary Systems and Professionals' Software,
Inc., the Company has become the leading U.S. supplier of veterinary practice
information management software systems. Through locations in the U.S., England,
Japan and Australia, the Company provides rapid, affordable, high-quality
laboratory services to veterinarians. In October 1998, the Company acquired Blue
Ridge Pharmaceuticals, Inc., a company engaged in the development of novel
therapeutics for the veterinary market.

    In developing its businesses, the Company has employed a number of
strategies, including the licensing of human diagnostic technology and the
adaptation of that technology for veterinary applications, internal research and
development, strategic acquisitions, and an emphasis on single-use products and
instrument-based products that offer a significant opportunity for repeatable
sales of associated consumables. The Company's strategy is to maintain and build
upon its market-leading positions in veterinary diagnostics and veterinary
practice information management software to offer total animal health solutions
to the veterinary market through the integration of diagnostics, therapeutics
and information systems and services. The Company also will continue to evaluate
acquisition, licensing and other opportunities in complementary areas within the
veterinary and food and environmental markets.

================================================================================

    IDEXX(R), Better Choice(TM), CITE(R), Colilert(R), Colisure(TM), Defined
Substrate Technology(R), DiaSystems(TM), DST(R), Enterolert(TM),
Facilitator(TM), FlockChek(R), HerdChek(R), IDEXX VetLab(TM), LacTek(TM),
Parallux(TM), PetChek(R), Probe(R), Quanti-Tray(R), SNAP(R), VetConnect(TM),
VetLyte(R) and VetTest(R) are trademarks of the Company. Cornerstone(R) is used
under a license agreement. Autoread(TM), QBC(R) and VetAutoread(TM) are
trademarks of Becton Dickinson and Company ("Becton"). All other products and
company names are trademarks of their respective holders.



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PRODUCTS AND SERVICES

    The Company operates in two primary business areas: products and services
for the veterinary market and products and services for food and environmental
markets.

*  VETERINARY PRODUCTS AND SERVICES

         IMMUNOASSAYS

    The Company provides a broad range of point-of-care diagnostic products for
use by veterinarians in testing for a variety of companion animal diseases and
health conditions. The Company markets a line of single-use, hand-held test
kits, under the SNAP, CITE Probe and CITE trademarks, to veterinary clinics and
animal hospitals for the detection of diseases and other conditions in dogs,
cats and horses. These trademarks designate different testing delivery systems,
each of which is designed to address different customer needs and to allow quick
(in most cases, less than ten minutes), accurate and convenient testing without
the need for laboratory equipment. These products enable veterinarians to
provide improved service to animal owners by delivering test results almost
immediately, allowing the veterinarians to initiate therapy during the office
visit, if required.

    The Company's test kits incorporate immunoassay technology based on
antibody-antigen reactions. Antibodies are proteins produced as a result of an
immune response, a biological mechanism that enables certain animals to
recognize and respond to substances foreign to the body, called antigens.
Antibodies are produced by the immune system specifically to bind to these
antigens and also signal other immune system cells to assist in eliminating the
antigen. Antigens include viruses, bacteria, parasites, and hormones. In
immunoassay-based tests, a sample containing an unknown quantity of the analyte
is mixed with one or more reagents. Certain of these reagents contain either
antibodies or antigens that bind in a highly specific manner to the analyte.
Certain reagents are labeled with an indicator chemical, which identifies the
presence or absence of the analyte. In some cases results can be read visually;
in others, instruments are used to determine the results.

    The Company's veterinary immunoassays use enzyme labels to indicate the
presence or absence of a specific analyte. In these enzyme-linked immunosorbent
assays ("ELISA"), the test results are measured through a color change, which
varies in proportion to the amount of the analyte present in the sample.

    The Company offers SNAP immunoassays to detect feline leukemia virus
("FeLV") in cats and heartworm disease in dogs and cats. The Company also has
developed and markets a feline combination test, the SNAP Combo FeLV/FIV, which
enables veterinarians to test simultaneously for FeLV and feline
immunodeficiency virus ("FIV") (which resembles the human AIDS virus), and a
canine combination test that tests simultaneously for heartworm and Ehrlichia
canis, a tick-borne organism that can create a wide range of health problems in
dogs. Other small animal assays include tests for thyroid hormone levels in dogs
and cats and parvovirus, which causes a gastrointestinal disease in dogs. The
Company's equine product tests for immune status in newborn foals.

    The Company also markets a line of ELISA microwell-based test kits, under
the PetChek name, for testing in larger clinics and independent laboratories
serving the veterinary market. PetChek tests offer accuracy, ease of use and
cost advantages to high-volume customers. The Company currently sells PetChek
tests for feline leukemia virus, feline immunodeficiency virus and heartworm
disease. The Company also markets a microwell-based test kit for feline
coronavirus under the DiaSystems trade name.

         INSTRUMENTS

    The Company markets four instrument systems for use in veterinary clinics.
These instruments are distributed under the trade names of VetTest, QBC(R)
VetAutoread(TM), VetLyte and VetTest SNAP Reader.

    VETTEST ANALYZER. The VetTest blood chemistry analyzer is used to measure
levels of certain enzymes and other substances in blood in order to assist the
veterinarian in diagnosing physiologic conditions. Twenty-one separate blood
chemistry tests can be performed on the VetTest analyzer. The system is capable
of running up to 12 tests at a time on a single sample. The Company also offers
prepackaged general health profiles which include 12 frequently used chemistries
and pre-anesthetic panels for young animals consisting of six chemistries each.
Commonly run tests include glucose, alkaline phosphatase, ALT (alanine
aminotransferase), creatinine, BUN (blood urea nitrogen) and total protein.
VetTest analyzers are manufactured for the Company by Tokyo Parts Industrial Co.
under an agreement that renews annually unless either party notifies the other
of its decision not to renew. The dry chemistry slides used in the VetTest
analyzer (the "VetTest Slides") are supplied by Ortho-Clinical Diagnostics, Inc.
(formerly known as Johnson and Johnson Clinical Diagnostics, Inc.) ("Ortho")
under a Supply Agreement with Ortho (as amended, the "Ortho Agreement"). The
Company is required to purchase all of its requirements for slides from Ortho to
the extent available. In addition, the Company has committed to minimum annual
purchase volumes of certain VetTest Slides during the term of the Ortho




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 Agreement. The Ortho Agreement does not prohibit Ortho from selling comparable
slides or licensing its slide technology for use in veterinary applications and
Ortho currently sells comparable slides for use in its own analyzer, which is
primarily designed for human applications but is also used in the veterinary
market. Although the Company does not believe sales by Ortho in the veterinary
market currently have a material adverse effect on the business of the Company,
there can be no assurance that such sales will not have such a material adverse
effect in the future. The Ortho Agreement expires on December 31, 2010 and
contains provisions for the negotiation of a renewal term of five years.

    QBC(R) VETAUTOREAD(TM) HEMATOLOGY SYSTEM. The QBC(R) VetAutoread(TM)
hematology system is used to evaluate certain components of blood. This
hematology analyzer is based on Quantitative Buffy Coat technology, which uses
centrifugal force to separate a blood sample into its key components. The blood
sample is centrifuged at high speed in a proprietary test device, and the
different components of the blood separate by density. The QBC(R)
VetAutoread(TM) hematology system scans the blood tube, quantifies the different
components and calculates parameters. These values are then compared to normal
ranges contained in the software of the analyzer, which assists the veterinarian
in determining whether disease states are indicated that requires further
investigation. Key components evaluated are red blood cells (anemia/internal
bleeding), white blood cells (infection, immunosuppression, allergy), and
platelets (clotting capability). The system is based on the Becton QBC(R)
Autoread(TM) hematology system sold to physicians for human applications. The
QBC(R) VetAutoread(TM) hematology system is manufactured for IDEXX by Becton
under a development and distribution agreement which requires Becton to supply
analyzers to IDEXX through 2008 and reagents through 2010. IDEXX has committed
to minimum annual purchases of analyzers and reagents under the agreement.

    VETTEST SNAP READER. The VetTest SNAP Reader allows the veterinarian to
obtain quantitative measurement of hormones including thyroxine and cortisol.
These measurements assist in diagnosing and monitoring the treatment of certain
endocrine diseases, such as hyper- and hypo-thyroidism, Cushing's syndrome and
Addison's disease. In addition, the analyzer allows the veterinarian to monitor
the effect of treatment on these diseases. The VetTest SNAP Reader is a module
which can be integrated with the VetTest chemistry analyzer. Samples and
reagents are introduced to the analyzer using the Company's SNAP device. The
quantitative measurement is performed automatically with results available for
interpretation in less than 15 minutes after sample introduction. The results
are downloaded and displayed on the VetTest analyzer.

    VETLYTE SYSTEM. The VetLyte system measures three electrolytes -- sodium,
potassium and chloride -- to aid in evaluating acid-base and electrolyte
balances and assessing plasma hydration. Samples are introduced to the analyzer
through a probe. The assay operation, including the addition of reagents from an
enclosed solution pack, is performed automatically. Test results are available
in less than one minute after sample introduction and are either displayed on
the VetLyte analyzer or downloaded to the VetTest analyzer.

    The Company also provides computer software which facilitates the
integration of results obtained on these four systems. This linkage of the four
analyzer systems as part of the IDEXX VetLab (the combination of the VetTest,
QBC(R) VetAutoread(TM), VetLyte and VetTest SNAP Reader analyzers) allows the
veterinarian to produce a report containing the same types of information in a
more timely manner than would typically be provided by commercial laboratories
performing the same tests. A veterinarian using the Company's Better Choice
practice management software system can also automatically transfer results
obtained from the IDEXX VetLab to the applicable patient records.

         VETERINARY LABORATORY AND CONSULTING SERVICES

    The Company offers commercial veterinary laboratory and consulting services
to approximately 6,000 veterinary clinics in the U.S. through facilities located
in Arizona, California, Colorado, Illinois, Massachusetts, New Jersey, Oregon
and Texas. Through subsidiaries located in the United Kingdom, Japan and
Australia, the Company offers commercial veterinary laboratory services to
approximately 4,000 veterinary clinics located in those countries. Veterinarians
use the Company's services by submitting samples by courier or overnight
delivery to the appropriate Company facility based on location, type of sample
and workload at the facility. The commercial reference laboratories offer a
large selection of tests and diagnostic panels to detect a number of disease
states and other conditions in production and companion animals. Services
include chemistry, hematology and pathology.

    Additionally, the Company provides specialized veterinary consultation,
telemedicine and advisory services, including cardiology, radiology, internal
medicine, dermatology and ultrasound consulting. These services permit
veterinarians to obtain readings and interpretations of test results transmitted
by telephone and over the Internet from the veterinarians' offices. The services
can be provided during the course of a visit, thereby giving veterinarians
immediate access to specialists. The Company employs or retains as consultants
approximately 33 board-certified specialists, who handle over 70,000 cases per
year for over 9,000 veterinary clinics and hospitals in the U.S., Canada and
approximately 12 other countries.



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 Approximately 69%, 70% and 71% of the Company's total revenues were derived
from sales of veterinary diagnostic products and services in 1999, 1998 and
1997, respectively.

         INFORMATICS PRODUCTS AND SERVICES

    The Company's veterinary informatics business was formed in 1997 with the
acquisition of Advanced Veterinary Systems, located in Eau Claire, Wisconsin,
and Professionals' Software, Inc., located in Effingham, Illinois. In 1998 most
operations were consolidated in Eau Claire, Wisconsin. The Company provides
comprehensive veterinary practice information management solutions designed to
assist veterinarians in delivering high quality medical care and increasing the
profitability of their businesses. The Company believes that it is the leading
provider of veterinary practice information management systems ("PIMS") in the
U.S. with an installed based of more than 8,000 of the approximately 25,000
veterinary hospitals in North America. The Company's two principal software
products are its Cornerstone and Better Choice systems. The Company provides
software and hardware support for its PIMS and derives a significant proportion
of its revenues from ongoing service contracts.

    In January 2000, the Company launched VetConnect.com, an Internet
portal/application services provider for the veterinary medical market.
VetConnect is a comprehensive suite of information and business services
designed to support veterinary medical practice and extend the value of the
Company's in-clinic products, laboratory and consulting services and information
offerings. VetConnect revenues are derived from subscription fees, advertising
and related charges and fees on e-commerce and other transactions completed
through the site.

    The goal of VetConnect is to improve animal health by creating a
comprehensive, integrated electronic network among veterinarians, their clients,
colleagues and animal health companies. VetConnect provides online access to
current medical content through agreements with leading veterinary textbook and
periodical publishers; business-to-business electronic commerce through
strategic alliances with veterinary distributors and suppliers; and real-time
access to laboratory results generated by the Company's reference laboratories,
to which veterinarians send samples for diagnostic testing. In addition,
VetConnect provides e-mail and tools that permit veterinary hospitals to
generate and maintain their own web sites and communicate with clients.

         VETERINARY PHARMACEUTICALS

      In October 1998 the Company acquired Blue Ridge Pharmaceuticals, Inc.
("Blue Ridge"), a privately-held company engaged in the development of novel
therapeutics for the veterinary market. Blue Ridge was formed in 1996 to develop
products for therapeutic applications in companion animals and livestock that
might not fit the strategic goals of larger pharmaceutical companies marketing
both human and veterinary products. Blue Ridge currently has 14 products in the
registration process with the Center for Veterinary Medicine ("CVM") of the
U.S. Food and Drug Administration ("FDA"). These products include a
nitazoxanide-based product for treatment of equine protozoal myeloencephalitis,
a neurological disease that is believed to affect approximately 200,000 horses
in the U. S.; a topical non-steroidal anti-inflammatory for equine use; and an
insulin product for treatment of diabetic cats. Blue Ridge also is developing,
among other things, antibiotic products that utilize proprietary, long-acting
delivery systems. In 1999, Blue Ridge introduced its first product, Facilitator,
a liquid bandage for use in dogs, cats and horses.

* FOOD AND ENVIRONMENTAL PRODUCTS AND SERVICES

    The Company sells products that detect microbial contaminants in water and
antibiotic residues in milk, and a broad range of diagnostic products for
disease surveillance and eradication and health management for production
animals.

         WATER AND DAIRY TESTING PRODUCTS

    The Company's Colilert, Colilert-18 and Colisure tests, based on Defined
Substrate Technology ("DST"), simultaneously detect total coliforms and E. coli
in water. These organisms are broadly used as indicators of microbial
contamination. The Company's DST products utilize indicator-nutrients which
produce a change in color or fluorescence when metabolized by target microbes in
the sample. Colilert, Colilert-18 and Colisure tests serve as a rapid method for
determining the presence or absence of both total coliforms and E. coli, with
results available in 24 hours, or 18 hours in the case of the Colilert-18 media.
Colilert, Colilert-18 and Colisure tests are used by government laboratories,
water utilities and private certified laboratories to test drinking water in
compliance with U.S. Environmental Protection Agency ("EPA") standards. The
tests are also used in evaluating water used in production processes (for
example, in beverage and pharmaceutical applications) and in evaluating bottled
water, recreational water and water from private wells.

    The Company's Enterolert product is also based on DST and detects
enterococci in recreational waters, with results available in 24 hours. The
Quanti-Tray device, when used in conjunction with the Company's Colilert,
Colilert-18, Colisure or Enterolert products, enables users to test for
microbiological contamination, and to obtain quantitative results without the




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time-consuming steps associated with traditional methods. The Company's
Colilert, Colilert-18, Colisure and Quanti-Tray products have been approved by
the EPA. In addition, the Colilert test has also been approved in Japan, Brazil,
Argentina, Colombia, Chile, New Zealand and parts of Australia, has been
published in the Federal Register in Mexico as a proposal for approval and is
under evaluation by regulatory agencies in certain countries in South America
and Asia. Colilert-18 has received approval in the United Kingdom and is under
evaluation by regulatory agencies in Europe.

    IDEXX is the worldwide leader in rapid testing of antibiotic residue in
milk. The Company offers tests on its SNAP platform, and in 1999 introduced the
Parallux instrument, which the Company believes is the most automated and
complete antibiotic residue testing system in the world.

    Dairy farmers and producers use these tests for incoming quality assurance
of raw milk, and government and food quality managers use them for ongoing
surveillance. IDEXX dairy quality tests are designed for convenience in field
and laboratory testing applications and are calibrated to detect analytes at
specified levels.

         PRODUCTION ANIMAL SERVICES

    The Company's HerdChek product line consists of immunoassay kits and related
instruments which detect diseases in swine and cattle, including an often fatal,
highly contagious disease in swine caused by pseudorabies virus and a disease in
cattle caused by infectious bovine rhinotracheitis. The product line also
includes a test for porcine reproductive respiratory syndrome, a swine disease
that has been shown to have a severe health impact on infected herds, and for a
cattle disease known as mycobacterium paratuberculosis ("Johne's disease"),
which can cause significant economic loss for cattle producers.

    The Company has three test kits based on DNA probe technology, marketed
under the name IDEXX DNA Probe, for the diagnosis of Johne's disease in cattle,
and Mycoplasma gallisepticum ("MG") and Mycoplasma synoviae ("MS") infections in
poultry. Respiratory infections caused by MG or MS cause significant economic
loss for poultry breeders. DNA probes offer a direct means of detecting the
presence of certain organisms through the recognition of specific DNA sequences.

    The Company's FlockChek product line comprises a range of enzyme immunoassay
test kits and related instrumentation and software used in poultry health
management programs. Kits in the FlockChek product line are used to test for
immunity to leading avian pathogens, including Newcastle disease virus,
infectious bursal disease virus, infectious bronchitis virus, reovirus,
mycoplasma and Salmonella enteriditis.

    Approximately 22%, 23% and 24% of the Company's revenues were derived from
sales of food and environmental products and services in 1999, 1998 and 1997,
respectively. Through a series of transactions completed late in 1999 and early
2000, IDEXX disposed of the food microbiology testing products and services
business. Revenues from this business were $14 million, $13 million and $11
million in 1999, 1998 and 1997, respectively.

MARKETING AND DISTRIBUTION

    IDEXX markets, sells and services its products in more than 50 countries
through its marketing, sales and technical service groups as well as through
independent distributors and other resellers. The Company maintains sales
offices outside the U.S. in Australia, France, Germany, Italy, Japan, New
Zealand, The Netherlands, Spain, Taiwan and the United Kingdom.

    The Company selects the appropriate distribution channel for its products
based on the type of product, technical service requirements, number and
concentration of customers, regulatory requirements and other factors. The
Company markets its veterinary diagnostic products to veterinarians both
directly and through independent veterinary distributors in the U.S., with most
instruments sold directly by IDEXX sales personnel and test kits and consumables
supplied both via the distribution channel and directly. Outside the U.S., IDEXX
sells its veterinary diagnostic products through independent distributors and
other resellers and, in certain countries, through its direct sales force. The
Company markets its software products and veterinary laboratory services through
its direct sales force. The Company markets its water, dairy, livestock and
poultry products primarily through its direct sales force in the U.S. and
Canada. Outside the U.S. and Canada, IDEXX markets these products through
selected independent distributors and, in certain countries, through its direct
sales force.

    In 1999, 1998 and 1997, 27%, 28% and 32%, respectively, of the Company's
revenue was attributable to sales of products and services to customers outside
the U.S. Risks associated with foreign operations include the need for
additional regulatory approvals, possible disruptions in transportation of the
Company's products, the differing product needs of foreign customers,
difficulties in building and managing foreign operations, fluctuations in the
value of foreign currencies, import/export duties and quotas, and unexpected
regulatory, economic or political changes in foreign markets. The Company
engages in limited hedging activities to reduce the effect of foreign currency
fluctuations on its earnings.



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RESEARCH AND DEVELOPMENT

    The Company's research and development activities are focused on the
enhancement of its existing detection systems; the development of new test kits
for additional diagnostic applications; the development of new detection systems
incorporating advances in immunology, cell and molecular biology, microbiology,
DNA probes and other technologies; the development and delivery of new
information solutions for its customers in veterinary, food and environmental
markets; and the development of novel veterinary therapeutics. The Company's
research and development expenses were approximately $27.3, $22.7 and $17.1
million in 1999, 1998 and 1997, respectively.

PATENTS AND LICENSES

    The Company holds 27 U.S. patents and has filed patent applications for 26
other processes or products. The Company also holds five foreign patents and has
filed 20 foreign patent applications which correspond to U.S. patents and patent
applications of the Company.

    The Company also has pursued a strategy of licensing patents and
technologies from third parties to provide it with competitive advantages in
selected markets and to accelerate new product introductions. These licenses
include an exclusive royalty-bearing license for diagnostic products for the
feline immunodeficiency virus from The Regents of the University of California,
and an exclusive royalty-bearing license for the Defined Substrate Technology
utilized in the Colilert test. In addition, the Company holds a royalty-bearing
license for canine heartworm tests from Barnes-Jewish Hospital.

    The Company currently licenses certain technologies used in its products
from third parties, and expects to continue to do so in the future. Moreover, to
the extent the Company's products embody technologies protected by patents,
copyrights or trade secrets of others, the Company may be required to obtain
licenses to such technologies in order to continue to sell such products. There
can be no assurance that any technology licenses which the Company desires or is
required to obtain will be available on commercially reasonable terms. The
failure to obtain any such licenses may delay or prevent the sale by the Company
of certain new or existing products. See "Legal Proceedings" and "Management's
Discussion and Analysis of Financial Condition and Results of Operations."

PRODUCTION

    Certain components of the Company's products are available from only one
source. The Company purchases all of its CITE devices from Beckman Coulter. The
Company purchases all of its VetTest analyzers from Tokyo Parts Industrial Co.,
all of its VetTest slides from Ortho and all of its hematology components from
Becton. Certain key components of the Colilert product are available only from a
single source. The Company also purchases certain of the components for its
LacTek dairy reader instrument from single sources. While the Company does not
anticipate difficulties in obtaining the components used in its products, the
loss of any of these sources of supply would have a material adverse effect on
the Company. The Company has contractual commitments or outstanding purchase
orders with Ortho, Tokyo Parts Industrial Co. and Becton covering its
anticipated 2000 requirements for slides, VetTest analyzers, hematology reagents
and instruments.

    Substantially all of the Company's revenue in each quarter results from
orders booked in that quarter. Accordingly, the Company maintains no significant
backlog and believes that its backlog at any particular date is not indicative
of future sales.

COMPETITION

    Competition in the Company's markets is intense. IDEXX competes with a large
number of companies ranging from very small businesses to large health care and
other companies, many of which have substantially greater financial,
manufacturing, marketing and product and service research resources than the
Company. In general, the particular companies with which IDEXX competes vary
with the Company's different markets. In most of its markets, the Company
competes with a number of companies. However, in the U.S. market for veterinary
laboratory services the Company competes primarily with Antech Diagnostics, a
unit of Veterinary Centers of America, Inc. In the markets for veterinary and
food and environmental test products, the Company competes primarily on the
basis of the ease of use, speed, accuracy and other performance characteristics
of its products and services, the breadth of its product line and services, the
effectiveness of its sales and distribution channels, customer service and
pricing. In the market for veterinary practice information management software
systems, the Company competes primarily on the basis of ease of use, speed and
other performance characteristics, the effectiveness of its customer service,
advances in technologies and pricing. In the market for animal health
information on the Internet, the Company competes primarily with start-up
Internet companies. The Company competes in this market primarily on quality of
content, ease of use and integration with existing practice management systems.



                                       7
<PAGE>   8
In the market for veterinary laboratory services, the Company competes on the
basis of service, price and quality.

    Academic institutions, governmental agencies and other public and private
research organizations are also conducting research activities and may
commercialize products on their own or through joint ventures. The existence of
competing products, services or procedures that may be developed in the future
may adversely affect the marketability of products and services developed by the
Company. The Company's competitive position will also depend on its ability to
attract and retain qualified scientific and other personnel, develop effective
proprietary products, implement production and marketing plans, obtain patent
protection and obtain adequate capital resources.

GOVERNMENT REGULATION

    Most diagnostic tests for animal health applications are regulated in the
U.S. by the Center for Veterinary Biologics within the U.S. Department of
Agriculture's ("USDA") Animal and Plant Health Inspection Service ("APHIS"). The
APHIS regulatory process involves the submission of product performance data and
manufacturing documentation. Subsequent to regulatory approval to market a
product, APHIS requires that each lot of product be submitted for review prior
to release to customers. In addition, APHIS requires special approval for
marketing products where test results are used in part for government-mandated
disease management programs. A number of foreign governments accept APHIS
approval as part of their separate regulatory approvals. However, compliance
with an extensive regulatory process is required in connection with marketing
diagnostic products in Japan, Germany, The Netherlands and many other countries.
The Company also is required to have a facility license from APHIS to
manufacture USDA-licensed products at its facility. The Company has obtained
such a license for its current manufacturing facility.

    The manufacture and sale of veterinary drugs are regulated by the Center for
Veterinarian Medicine ("CVM") of the FDA. A new animal drug may not be
commercially marketed in the United States unless it has been approved as safe
and effective by CVM. Approval may be requested by filing a New Animal Drug
Application ("NADA") with CVM containing substantial evidence as to the safety
and effectiveness of the drug. For food animals, the data must also include
extensive data to support a withdrawal period or other use restriction to ensure
that the proposed drug use will produce animals and animal products that are
safe for human consumption. Data regarding manufacturing methods and controls is
also required to be submitted with the NADA. Manufacturers of animal drugs must
also comply with the FDA's Good Manufacturing Practices. Sale of animal drugs in
countries outside the United States requires compliance with the laws of those
countries, which may be extensive.

    Most tests for water quality are regulated in the U.S. by the United States
Environmental Protection Agency ("EPA"). The EPA regulatory process involves
submission of extensive product performance data in accordance with an EPA
approved protocol, evaluation of the data by the EPA and publication for public
comment of any proposed approval in the Federal Register prior to final
approval. The sale of water testing products also is subject to extensive and
lengthy regulatory processes in many other countries around the world.

    The sale of dairy testing products in the U.S. is regulated by the FDA in
conjunction with the Association of Official Analytical Chemists - Research
Institute ("AOAC-RI"). Before a product may be sold, extensive product
performance data must be submitted in accordance with a protocol that is
approved by the FDA and the AOAC-RI. Following approval of a product by FDA, the
product must also be approved by the National Conference on Interstate Milk
Shipments ("NCIMS"), an oversight body that includes state, federal and industry
representatives. While some foreign countries accept AOAC-RI approval as part of
their regulatory approval process, many countries have separate regulatory
processes.

    Any acquisitions of new products and technologies may subject the Company to
additional areas of government regulation. These may involve food, drug and
water quality regulations of the FDA, the EPA and the USDA, as well as state,
local and foreign governments. See "Management's Discussion and Analysis of
Financial Condition and Results of Operations."

EMPLOYEES

    As of December 31, 1999, IDEXX had approximately 2,050 full-time and
part-time employees. The Company is not a party to any collective bargaining
agreement and believes that relations with its employees are good.

ITEM 2.  PROPERTIES

    IDEXX owns approximately 12 acres of land in Westbrook, Maine. IDEXX leases
approximately 290,000 square feet of industrial space in Westbrook, under a
lease expiring in 2008, approximately 75,000 square feet of industrial space in
Memphis, Tennessee for use as a distribution facility, under a lease expiring in
2007, and approximately 60,000 square feet of office and manufacturing space in
Illinois and Wisconsin for its veterinary practice management software business.




                                       8
<PAGE>   9

IDEXX also leases a total of approximately 100,000 square feet of smaller
office, manufacturing and warehouse space in the U.S. and elsewhere in the
world. In addition, the Company owns or leases approximately 114,000 square feet
of space in the U.S., Australia and the United Kingdom for use as veterinary
reference laboratories and office space for its veterinary consulting services.
Of this space, 46,000 square feet is owned by the Company and the remaining
amount is leased, under leases having expiration dates up to the year 2002.

ITEM 3.  LEGAL PROCEEDINGS

    In January 1998, a complaint was filed in the U.S. District Court for the
District of Maine captioned ROBERT A. ROSE, et.al. v. DAVID E. SHAW, ERWIN F.
WORKMAN, JR. and IDEXX LABORATORIES, INC. The plaintiffs purport to represent a
class of purchasers of the common stock of the Company from July 19, 1996
through March 24, 1997. The complaint claims that the defendants violated
Section 10(b) of the Securities Exchange Act of 1934 and Securities and Exchange
Commission Rule 10b-5 promulgated pursuant thereto, by virtue of false or
misleading statements made during the class period. The complaint also claims
that the individual defendants are liable as "control persons" under Section
20(a) of that Act. In addition, the complaint claims that the individual
defendants sold some of their own common stock of the Company, during the class
period, at times when the market price for the stock allegedly was inflated. In
July 1999, the U.S. District Court granted the Company's motion to dismiss the
case for failure to state a claim. However in August 1999, the plaintiffs
appealed that ruling to the U.S. Court of Appeals for the First Circuit. In
February 2000, the Company entered into a Memorandum of Understanding (the
"MOU") with the plaintiffs pursuant to which the parties have agreed to settle
the suit. Pursuant to the MOU, the Company and the plaintiffs have filed a
Stipulation of Settlement (the "Stipulation") with the U.S. District Court.
Subject to certain conditions, the Stipulation will become effective following
approval by the District Court and expiration of the time for any appeal. No
assurance can be given that the District Court will approve the Stipulation or
otherwise that the suit will be finally settled on the terms contained in the
MOU. The proposed settlement (in excess of the portion reimbursed through
insurance) will not affect results of operations in 2000. In the event that the
suit is not settled, the Company is unable to assess the likelihood of an
adverse result or estimate the amount of damages which the Company may be
required to pay. Any adverse outcome resulting in the payment of damages would
adversely affect the Company's results of operations.

    In December 1997, SA Scientific, Inc. ("SAS") filed suit against the Company
in the State of Texas District Court. SAS has alleged breach of a development
and supply agreement between SAS and the Company, negligent misrepresentation,
fraud and conversion of SAS's intellectual property, and is seeking $8,000,000
in actual damages, $24,000,000 in punitive damages, further unspecified damages
and attorneys' fees. The Company has filed an answer to the complaint denying
SAS's allegations and has asserted counterclaims against SAS for breach of
contract, fraud and conversion of the Company's property. The Company believes
that it has meritorious defenses to SAS's claims and is contesting the matter
vigorously. However, the Company is unable to assess the likelihood of an
adverse result or estimate the amount of damages the Company might be required
to pay. Any adverse outcome resulting in payment of damages would adversely
affect the Company's results of operations.

ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

    No matters were submitted to a vote of security holders during the fourth
quarter of the fiscal year covered by this report.

EXECUTIVE OFFICERS OF THE COMPANY

    The executive officers of the Company are as follows:

<TABLE>
<CAPTION>
      NAME                              AGE    TITLE
      ----                              ---    -----
<S>                                     <C>    <C>
      David E. Shaw...................  48     President, Chief Executive Officer and Chairman of the Board of Directors
      Erwin F. Workman, Jr., Ph.D.....  53     Executive Vice President and Chief Scientific Officer
      Ralph K. Carlton................  44     Senior Vice President
      S. Sam Fratoni, Ph.D............  52     Vice President
      Robert S. Hulsy.................  55     Vice President
      Roland H. Johnson...............  46     Vice President
      Louis W. Pollock................  46     Vice President
      Roy V. H. Pollock, D.V.M., Ph.D.  50     Vice President
      Merilee Raines..................  44     Vice President, Finance
</TABLE>

    Mr. Shaw has been President and Chief Executive Officer of the Company since
July 1999. Mr. Shaw served as Chairman of the Board of Directors and Chief
Executive Officer of the Company from its founding in 1983 until February 1999,
and as President from 1983 until October 1993. He was Executive Chairman from
February 1999 to July 1999. Prior to founding the Company, he was a Vice
President of Agribusiness Associates, Inc., an international management
consulting firm.


                                       9
<PAGE>   10

    Dr. Workman joined the Company in July 1984, and he has served as Chief
Scientific Officer and Executive Vice President since November 1997 and as a
Director since 1993. He also served as President and Chief Operating Officer
from 1993 to November 1997. Before joining the Company, he was Manager of
Research and Development for the Hepatitis and AIDS Business Unit within the
diagnostic division of Abbott Laboratories, Inc.

    Mr. Carlton has been Senior Vice President of the Company since joining the
Company in February 1997. He has been President of the Company's Information
business since October 1999. From February 1997 to October 1999, Mr. Carlton
served as Chief Financial Officer. Prior to joining the Company in February
1997, Mr. Carlton was a Senior Vice President with the investment banking firm
of Donaldson, Lufkin & Jenrette, from March 1995. From 1986 to March 1995, he
was with the investment banking firm of Goldman, Sachs & Co., where he served in
various capacities, the most recent being as a Vice President.

    Dr. Fratoni has been Vice President of the Company since May 1997 and
President of the Company's Food and Environmental Division since July 1999. From
May 1997 to July 1999 Dr. Fratoni was Vice President of Human Resources of the
Company and from October 1996 to May 1997, he was Director of Business
Development for the Food and Environmental Division. Prior to joining the
Company in October 1996, Dr. Fratoni held various positions with Hewlett Packard
Company.

    Mr. Hulsy has been Vice President of the Company since February 1999 and
President of the Company's IDEXX Veterinary Services subsidiary since August
1998. Prior to joining the Company in August 1998, Mr. Hulsy was President of
American Environmental Network, Inc. from 1992 to 1998.

    Mr. Johnson became a Vice President of the Company in October 1998. He has
been President and Chief Executive Officer of Blue Ridge since August 1996. For
15 years prior to forming Blue Ridge, Mr. Johnson was employed by Ciba Animal
Health, most recently as Vice President Sales and Service.

    Mr. Louis W. Pollock became a Vice President of the Company in December 1994
and has been President of the Company's Professional Office Diagnostics Division
since July 1999. Mr. Pollock joined the Company in 1986 and served in positions
of increasing responsibility in veterinary products sales management prior to
serving as President of the Company's International Division from December 1994
to March 1996 and as President of the Company's Food and Environmental Division
from March 1996 until July 1999. Prior to joining the Company, Mr. Pollock was
employed in various sales and marketing positions with Abbott Laboratories, Inc.

    Dr. Roy V. H. Pollock became a Vice President of the Company in February
1998. Dr. Pollock joined the Company in November 1997 as Vice President of the
Company's Informatics Division. In 1999, Dr. Pollock became President of the
Company's VetConnect subsidiary. From 1995 until he joined the Company, Dr.
Pollock served as Vice President of the Companion Animal Division of Pfizer
Animal Health. Dr. Pollock was Vice President and Director, Strategic Product
Development, at SmithKline Beecham Animal Health from 1993 to 1995. Dr. Pollock
has also held faculty positions at Cornell University and Purdue University.

    Ms. Raines has been Vice President, Finance of the Company since May 1995.
She served as Division Vice President, Finance from March 1995 to May 1995,
Director of Finance from 1988 to March 1995 and Controller from 1985 to 1988.

PART II.

ITEM 5. MARKET FOR THE REGISTRANT'S COMMON STOCK AND RELATED STOCKHOLDER MATTERS

    Information concerning the market price for the Company's Common Stock and
dividend policy is included under the section labeled "Market for the
Registrant's Common Stock and Related Stockholder Information" in the Company's
1999 Annual Report to Stockholders and is incorporated herein by reference.

ITEM 6. SELECTED FINANCIAL DATA

    The information required under this item is included under the section
labeled "Selected Financial Information" in the Company's 1999 Annual Report to
Stockholders and is incorporated herein by reference.



                                       10
<PAGE>   11

ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
OF OPERATIONS

    The information required under this item is included under the heading
"Management's Discussions and Analysis of Financial Condition and Results of
Operations" in the Company's 1999 Annual Report to Stockholders and is
incorporated herein by reference.

ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURE ABOUT MARKET RISK

    Not applicable.

ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

    The Company's Consolidated Financial Statements as of December 31, 1999 and
Supplementary Data are included in the Company's 1999 Annual Report to
Stockholders and are incorporated herein by reference.

ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
FINANCIAL DISCLOSURE

    None.

PART III

ITEMS 10-13.

    Except as indicated below, the information required by Part III is omitted
from this Annual Report on Form 10-K, and, pursuant to Regulation 14A of the
Securities Exchange Act of 1934, as amended, is incorporated herein by reference
to the definitive proxy statement with respect to the Company's 2000 Annual
Meeting of Stockholders to be filed by the Company with the Securities and
Exchange Commission not later than 120 days after the end of the fiscal year
covered by this report. The information required by Part III will appear under
the headings "Beneficial Ownership of Common Stock," and "ELECTION OF
DIRECTORS--Nominees," "-- Board and Committee Meetings," "--Directors'
Compensation" and "-- Executive Compensation." Information regarding executive
officers of the Company is furnished in Part I of this Annual Report on Form
10-K under the heading "Executive Officers of the Company."

PART IV

ITEM 14. EXHIBITS, FINANCIAL STATEMENT SCHEDULES, AND REPORTS ON FORM 8-K


(a)      Financial Statements and Schedules
         (1)     The consolidated financial
                 statements set forth in the list
                 below are filed as part of this
                 Annual Report on Form 10-K.
         (2)     The consolidated financial statement
                 schedule set forth in the list below
                 is filed as a part of this Annual
                 Report on Form 10-K.
         (3)     Exhibits filed herewith or
                 incorporated herein by reference are
                 set forth in Item 14(c) below.

         List of Financial Statements and Schedules
         referenced in this Item 14. Information
         incorporated by reference from Exhibit 13
         filed herewith:
                 Report of Independent Public Accountants
                 Consolidated Balance Sheets
                 Consolidated Statements of Operations
                 Consolidated Statements of Stockholders Equity
                 Consolidated Statements of Cash Flows
                 Notes to Consolidated Financial Statements

         Financial Statement Schedules filed herewith:
                 Schedule II - Valuation and Qualifying Accounts
                 All other Schedules are omitted because they are not applicable
                 or not required, or because the required information is already
                 provided herein.

(b)      None

(c)      See Exhibit Index on the page immediately preceding exhibits.




                                       11
<PAGE>   12




                                   SIGNATURES

    Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the Registrant has duly caused this report to be signed on
its behalf by the undersigned, thereunto duly authorized:

                                      IDEXX LABORATORIES, INC.

                                      By: /s/ David E. Shaw
                                          -------------------------------------
                                          David E. Shaw
                                          President and Chief Executive Officer
                                          March 29, 2000

    Pursuant to the requirements of the Securities Exchange Act of 1934, this
report has been signed below by the following persons on behalf of the
Registrant and in the capacities and on the dates indicated:

<TABLE>
<CAPTION>
                         SIGNATURE                                   TITLE                          DATE
                         ---------                                   -----                          ----

<S>                                                 <C>                                       <C>
         /s/ David E. Shaw                          President, Chief Executive Officer and    March 29, 2000
         ------------------------------------------ Chairman of the Board of Directors
         David E. Shaw

         /s/ Merilee Raines                         Vice President, Finance and               March 29, 2000
         ------------------------------------------ Treasurer (Principal Financial
         Merilee Raines                             and Accounting Officer)


         /s/ Erwin F. Workman, Jr.                  Executive Vice President,                 March 29, 2000
         ------------------------------------------ Chief Scientific Officer
         Erwin F. Workman, Jr.                      and Director


         /s/ Thomas Craig                           Director                                  March 29, 2000
         ------------------------------------------
         Thomas Craig

         /s/ Mary L. Good                           Director                                  March 29, 2000
         ------------------------------------------
         Mary L. Good

         /s/ John R. Hesse                          Director                                  March 29, 2000
         ------------------------------------------
         John R. Hesse

         /s/ James L. Moody, Jr.                    Director                                  March 29, 2000
         ------------------------------------------
         James L. Moody, Jr.

         /s/ Kenneth Paigen                         Director                                  March 29, 2000
         ------------------------------------------
         Kenneth Paigen

         /s/ William F. Pounds                      Director                                  March 29, 2000
         ------------------------------------------
         William F. Pounds

         /s/ Gabriel Schmergel                      Director                                  March 29, 2000
         ------------------------------------------
         Gabriel Schmergel
</TABLE>





                                       12
<PAGE>   13






                                  EXHIBIT INDEX

    2.1(9)     Stock Purchase Agreement dated as of September 23, 1998 by and
               among the Company, Blue Ridge Pharmaceuticals, Inc. ("Blue
               Ridge") and the stockholders of Blue Ridge. Certain schedules and
               exhibits to the agreement (each of which are identified in the
               agreement) have been omitted in reliance upon Rule 601 (b)(2) of
               Regulation S-K. The Company hereby undertakes to furnish such
               schedules and exhibits to the Commission supplementally upon
               request.
    3.1(7)     Restated Certificate of Incorporation of the Company, as amended.
  **3.2        Amended and Restated By-Laws of the Company.
    4.1(1)     Rights Agreement, dated as of December 17, 1996, between the
               Company and BankBoston, N.A. as Rights Agent, which includes as
               Exhibit A the Form of Certificate of Designations, as Exhibit B
               the Form of Rights Certificate, and as Exhibit C the Summary of
               Rights to Purchase Preferred Stock.
    4.2(11)    Amendment No. 1 to Rights Agreement dated July 22, 1999, between
               the Company and BankBoston, N.A.
    4.3(9)     Form of Warrant dated October 1, 1998 to purchase Common Stock of
               the Company issued to shareholders of Blue Ridge other than
               employee shareholders.
    4.4(9)     Form of Warrant dated October 1, 1998 to purchase Common Stock of
               the Company issued to employee shareholders of Blue Ridge.
    4.5        Instruments with respect to other long-term debt of the Company
               and its consolidated subsidiaries are omitted pursuant to Item
               601(b)(4)(iii) of Regulation S-K since the total amount
               authorized under each such omitted instrument does not exceed 10
               percent of the total assets of the Company and its subsidiaries
               on a consolidated basis. The Company hereby agrees to furnish a
               copy of any such instrument to the Securities and Exchange
               Commission upon request.
   10.1(2)     1984 Stock Option Plan of the Company, as amended.
 **10.2        1991 Stock Option Plan of the Company, as amended.
 **10.3        1991 Director Option Plan of the Company, as amended.
   10.4(6)     1997 Director Option Plan of the Company, as amended, with the
               form of option agreement granted thereunder attached thereto.
   10.5(10)    1999 Director Stock Plan.
  *10.6(3)     Supply Agreement, dated January 15, 1992, between the Company and
               Ortho-Clinical Diagnostics, Inc. ("Ortho") (formerly known as
               Johnson & Johnson Clinical Diagnostics, Inc.), as assignee of
               Eastman Kodak Company.
  *10.6a(2)    Amendment to Supply Agreement, dated November 16, 1993, and
               Second Amendment to Supply Agreement, dated November 19, 1993,
               between the Company and Ortho.
  *10.6b(4)    Third Amendment to Supply Agreement, dated March 15, 1994,
               between the Company and Ortho.
  *10.6c(5)    Fourth Amendment to Supply Agreement, effective as of January 1,
               1996, between the Company and Ortho.
+**10.6d       Fifth Amendment to Supply Agreement, dated December 15, 1999,
               between the Company and Ortho.
   10.7(8)     Employment Agreement dated April 25, 1997 between the Company and
               David E. Shaw.
   10.8(8)     Employment Agreement dated April 25, 1997 between the Company and
               Erwin F. Workman, Jr., Ph.D.
   10.9(12)    1998 Stock Incentive Plan of the Company, as amended.
   10.10(13)   Agreement dated August 26, 1999 between the Company and David E.
               Shaw.
   10.11(9)    Employment Agreement dated September 23, 1998 between the Company
               and Roland H. Johnson.
 **13          Annual Report to Stockholders for year ended
               December 31, 1999. (only those portions incorporated herein by
               reference).
 **21          Subsidiaries of the Company.
 **23.1        Consent of Arthur Andersen LLP.
 **27          Financial Data Schedule for Annual Report on Form 10-K for 1999.

- ------------

(1)       Incorporated by reference to the Exhibits to the Company's
          Registration Statement on Form 8-A dated December 24, 1996 (File No.
          0-19271).

(2)       Incorporated by reference to the Exhibits to the Company's Annual
          Report on Form 10-K dated March 30, 1994.

(3)       Incorporated by reference to the Exhibits to the Company's Amendment
          No. 1 on Form 8 dated February 14, 1992 to the Company's Current
          Report on Form 8-K dated January 30, 1992.

(4)       Incorporated by reference to the Exhibits to the Company's Quarterly
          Report on Form 10-Q dated May 11, 1994.

(5)       Incorporated by reference to the Exhibits to the Company's Quarterly
          Report on Form 10-Q dated July 26, 1996.

(6)       Incorporated by reference to the Exhibits to the Company's Quarterly
          Report on Form 10-Q dated August 14, 1997.

(7)       Incorporated by reference to the Exhibits to the Company's Annual
          Report on Form 10-K dated March 31, 1997.

(8)       Incorporated by reference to the Exhibits to the Company's Annual
          Report on Form 10-K dated March 27, 1998.

(9)       Incorporated by reference to the Exhibits to the Company's Current
          Report on Form 8-K dated October 1, 1998.

(10)      Incorporated by reference to the Exhibits to the Company's Quarterly
          Report on Form 10-Q dated August 13, 1999.

(11)      Incorporated by reference to the Exhibits to the Company's Current
          Report on Form 8-K dated July 30, 1999.

(12)      Incorporated by reference to the Exhibits to the Company's Annual
          Report on Form 10-K dated March 31, 1999.

(13)      Incorporated by reference to the Exhibits to the Company's Quarterly
          Report on Form 10-Q dated November 12, 1999.
*         Confidential treatment previously granted as to certain portions.
**        Filed herewith.
+         Filed subject to request for confidential treatment.





                                       13

<PAGE>   1
                                                                     Exhibit 3.2











                          AMENDED AND RESTATED BY-LAWS

                                       OF

                            IDEXX LABORATORIES, INC.

                       (AMENDED THROUGH DECEMBER 8, 1999)


<PAGE>   2


                                     BY-LAWS

                                TABLE OF CONTENTS

<TABLE>
<S>                                                                               <C>
ARTICLE I - Stockholders ..................................................       4
         Section 1.1  Place of Meetings ...................................       4
         Section 1.2  Annual Meeting ......................................       4
         Section 1.3  Special Meetings ....................................       4
         Section 1.4  Notice of Meetings ..................................       4
         Section 1.5  Voting List .........................................       4
         Section 1.6  Quorum ..............................................       4
         Section 1.7  Adjournments ........................................       5
         Section 1.8  Voting and Proxies ..................................       5
         Section 1.9  Action at Meeting ...................................       5
         Section 1.10 Introduction of Business at Meeting .................       5
         Section 1.11 Action without Meeting ..............................       6

ARTICLE 2 - Directors .....................................................       7
         Section 2.1  General Powers ......................................       7
         Section 2.2  Number; Election and Qualification ..................       7
         Section 2.3  Classes of Directors ................................       7
         Section 2.4  Terms in Office .....................................       7
         Section 2.5  Allocation of Directors Among Classes in the Event of
                      Increases or Decreases in the Number of Directors ...       7
         Section 2.6  Tenure ..............................................       8
         Section 2.7  Vacancies ...........................................       8
         Section 2.8  Resignation .........................................       8
         Section 2.9  Regular Meetings ....................................       8
         Section 2.10 Special Meetings ....................................       8
         Section 2.11 Notice of Special Meetings ..........................       8
         Section 2.12 Meetings by Telephone Conference Calls ..............       8
         Section 2.13 Quorum ..............................................       9
         Section 2.14 Action at Meeting ...................................       9
         Section 2.15 Action by Consent ...................................       9
         Section 2.16 Removal .............................................       9
         Section 2.17 Committees ..........................................       9
         Section 2.18 Compensation of Directors ...........................       9
         Section 2.19 Amendments to Article ...............................      10

ARTICLE 3 - Officers ......................................................      10
         Section 3.1  Enumeration .........................................      10
         Section 3.2  Election ............................................      10
         Section 3.3  Qualification .......................................      10
         Section 3.4  Tenure ..............................................      10
         Section 3.5  Resignation and Removal .............................      10
         Section 3.6  Vacancies ...........................................      10
         Section 3.7  Chairman of the Board and Vice Chairman of the Board       11
         Section 3.8  President ...........................................      11
         Section 3.9  Vice President ......................................      11
</TABLE>


                                       2
<PAGE>   3

<TABLE>
<S>                                                                              <C>
         Section 3.10 Secretary and Assistant Secretaries .................      11
         Section 3.11 Treasurer and Assistant Treasurers ..................      11
         Section 3.12 Salaries ............................................      12

ARTICLE 4 - Capital Stock .................................................      12
         Section 4.1  Issuance of Stock ...................................      12
         Section 4.2  Certificates of Stock ...............................      12
         Section 4.3  Transfers ...........................................      12
         Section 4.4  Lost, Stolen or Destroyed Certificates ..............      13
         Section 4.5  Record Date .........................................      13

ARTICLE 5 - General Provisions ............................................      13
         Section 5.1  Fiscal Year .........................................      13
         Section 5.2  Corporate Seal ......................................      13
         Section 5.3  Waiver of Notice ....................................      13
         Section 5.4  Voting of Securities ................................      14
         Section 5.5  Evidence of Authority ...............................      14
         Section 5.6  Certificate of Incorporation ........................      14
         Section 5.7  Transactions with Interested Parties ................      14
         Section 5.8  Severability ........................................      15
         Section 5.9  Pronouns ............................................      15

ARTICLE 6 - Amendments ....................................................      15
         Section 6.1  By the Board of Directors ...........................      15
         Section 6.2  By the Stockholders .................................      15
</TABLE>




                                       3
<PAGE>   4


                       BY-LAWS OF IDEXX LABORATORIES, INC.

                            ARTICLE 1 - STOCKHOLDERS

1.1      PLACE OF MEETINGS. All meetings of stockholders shall be held at such
         place within or without the State of Delaware as may be designated from
         time to time by the Board of Directors or the President or, if not so
         designated, at the registered office of the corporation.

1.2      ANNUAL MEETING. The annual meeting of stockholders for the election of
         directors and for the transaction of such other business as may
         properly be brought before the meeting shall be held on a date to be
         fixed by the Board of Directors or the President (which date shall not
         be a legal holiday in the place where the meeting is to be held) at the
         time and place to be fixed by the Board of Directors or the President
         and stated in the notice of the meeting. If no annual meeting is held
         in accordance with the foregoing provisions, the Board of Directors
         shall cause the meeting to be held as soon thereafter as convenient. If
         no annual meeting is held in accordance with the foregoing provisions,
         a special meeting may be held in lieu of the annual meeting, and any
         action taken at that special meeting shall have the same effect as if
         it had been taken at the annual meeting, and in such case all
         references in these By-Laws to the annual meeting of the stockholders
         shall be deemed to refer to such special meeting.

1.3      SPECIAL MEETINGS. Special meetings of stockholders may be called at any
         time by the Chairman of the Board or the President. Business transacted
         at any special meeting of the stockholders shall be limited to matters
         relating to the purpose or purposes stated in the notice of meeting.

1.4      NOTICE OF MEETINGS. Except as otherwise provided by law, written notice
         of each meeting of stockholders, whether annual or special, shall be
         given not less than 10 nor more than 60 days before the date of the
         meeting to each stockholder entitled to vote at such meeting. The
         notices of all meetings shall state the place, date and hour of the
         meeting. The notice of a special meeting shall state, in addition, the
         purpose or purposes for which the meeting is called. If mailed, notice
         is given when deposited in the United States mail, postage prepaid,
         directed to the stockholder at his address as it appears on the records
         of the corporation.

1.5      VOTING LIST. The officer who has charge of the stock ledger of the
         corporation shall prepare, at least 10 days before every meeting of
         stockholders, a complete list of the stockholders entitled to vote at
         the meeting, arranged in alphabetical order, and showing the address of
         each stockholder and the number of shares registered in the name of
         each stockholder. Such list shall be open to the examination of any
         stockholder, for any purpose germane to the meeting, during ordinary
         business hours, for a period of at least 10 days prior to the meeting,
         at a place within the city where the meeting is to be held. The list
         shall also be produced and kept at the time and place of the meeting
         during the whole time of the meeting, and may be inspected by any
         stockholder who is present.

1.6      QUORUM. Except as otherwise provided by law, the Certificate of
         Incorporation or these By-Laws, the holders of a majority of the shares




                                       4
<PAGE>   5
         of the capital stock of the corporation issued and outstanding and
         entitled to vote at the meeting, present in person or represented by
         proxy, shall constitute a quorum for the transaction of business.

1.7      ADJOURNMENTS. Any meeting of stockholders may be adjourned to any other
         time and to any other place at which a meeting of stockholders may be
         held under these By-Laws by the stockholders present or represented at
         the meeting and entitled to vote, although less than a quorum, or, if
         no stockholder is present, by any officer entitled to preside at or to
         act as Secretary of such meeting. It shall not be necessary to notify
         any stockholder of any adjournment of less than 30 days if the time and
         place of the adjourned meeting are announced at the meeting at which
         adjournment is taken, unless after the adjournment a new record date is
         fixed for the adjourned meeting. At the adjourned meeting, the
         corporation may transact any business, which might have been transacted
         at the original meeting.

1.8      VOTING AND PROXIES. Each stockholder shall have one vote for each share
         of stock entitled to vote held of record by such stockholder and a
         proportionate vote for each fractional share so held, unless otherwise
         provided by law or in the Certificate of Incorporation. Each
         stockholder of record entitled to vote at a meeting of stockholders, or
         to express consent or dissent to corporate action in writing without a
         meeting, may vote or express such consent or dissent in person or may
         authorize another person or persons to vote or act for him by proxy
         executed in writing (or in such other manner permitted by the General
         Corporation Law of Delaware) by the stockholder or his authorized agent
         and delivered to the Secretary (including by electronic transmission)
         of the corporation. No such proxy shall be voted or acted upon after
         three years from the date of its execution, unless the proxy expressly
         provides for a longer period.

1.9      ACTION IN A MEETING. When a quorum is present at any meeting, the
         holders of a majority of the stock present or represented and voting on
         a matter (or if there are two or more classes of stock entitled to vote
         as separate classes, then in the case of each such class, the holders
         of a majority of the stock of that class present or represented and
         voting on a matter) shall decide any matter to be voted upon by the
         stockholders at such meeting, except when a different vote is required
         by express provision of law, the Certificate of Incorporation or these
         By-Laws. Any election by stockholders shall be determined by a
         plurality of the votes cast by the stockholders entitled to vote at the
         election.

1.10     INTRODUCTION OF BUSINESS AT MEETING. Except as otherwise provided by
         law, at any annual or special meeting of stockholders only such
         business shall be conducted as shall have been properly brought before
         the meeting. In order to be properly brought before the meeting, such
         business must have been either (A) specified in the written notice of
         the meeting (or any supplement thereto) given to stockholders of record
         on the record date for such meeting by or at the direction of the Board
         of Directors, (B) brought before the meeting at the direction of the
         Board of Directors or the chairman of the meeting or (C) specified in a
         written notice given by or on behalf of a stockholder of record on the
         record date for such meeting entitled to vote thereat or a duly
         authorized proxy for such stockholder, in accordance with all of the
         following requirements. A notice referred to in clause (C) hereof must
         be delivered personally to or mailed to and received at the principal
         executive office of the corporation, addressed to the attention of the
         Secretary, not more than ten (10) days after the date of the initial
         notice referred to in clause (A) hereof, in the case of business to be



                                       5
<PAGE>   6
         brought before a special meeting of stockholders, and not less than
         thirty (30) days prior to the first anniversary date of the initial
         notice referred to in clause (A) hereof to the previous year's annual
         meeting, in the case of business to be brought before an annual meeting
         of stockholders, provided, however, that such notice shall not be
         required to be given more than sixty (60) days prior to an annual
         meeting of stockholders. Such notice referred to in clause (C) hereof
         shall set forth (i) a full description of each such item of business
         proposed to be brought before the meeting, (ii) the name and address of
         the person proposing to bring such business before the meeting, (iii)
         the number and class of shares held of record, held beneficially and
         represented by proxy by such person as of the record date for meeting
         (if such date has been made publicly available) and as of the date of
         such notice, (iv) if any item of such business involves nomination for
         director, all information regarding each such nominee that would be
         required to be set forth in a definitive proxy statement filed with the
         Securities Exchange Commission pursuant to Section 14 of the Securities
         Act of 1934, as amended, or any successor thereto, and the written
         consent of each such nominee to serve if elected, and (v) all other
         information that would be required to be filed with the Securities and
         Exchanged Commission if, with respect to the business proposed to be
         brought before the meeting, the person proposing such business was a
         participant in a solicitation subject to Section 14 of the Securities
         Exchange Act of 1934, as amended, or any successor thereto. No business
         shall be brought before any meeting of stockholders of the corporation
         otherwise than as provided in this paragraph.

         Notwithstanding the foregoing provisions, the Board of Directors shall
         be obligated to include information as to any nominee for director in
         any proxy statement or other communication sent to stockholders.

         The chairman of the meeting may, if the facts warrant, determine and
         declare to the meeting that any proposed item of business was not
         brought before the meeting in accordance with the foregoing procedure
         and, if he should so determine, he shall so declare to the meeting and
         the defective item of business shall be disregarded.

1.11     ACTION WITHOUT MEETING. Until the closing of a firm commitment,
         underwritten public offering of the corporation's Common Stock (a
         "Public Offering"), any action required or permitted to be taken at any
         annual or special meeting of stockholders of the corporation may be
         taken without a meeting, without prior notice and without a vote, if a
         consent in writing, setting forth the action so taken, is signed by the
         holders of outstanding stock having not less than the minimum number of
         votes that would be necessary to authorize or take such action at a
         meeting at which all shares entitled to vote on such action were
         present and voted. Prompt notice of the taking of corporate action
         without a meeting by less than unanimous written consent shall be given
         to those stockholders who have not consented in writing. Effective upon
         the closing of a Public Offering, stockholders of the corporation may
         not take any action by written consent in lieu of a meeting.
         Notwithstanding any other provision of law, the Certificate of
         Incorporation, as amended, or these By-Laws, and notwithstanding the
         fact that a lesser percentage may be specified by law, the affirmative
         vote of the holders of at least seventy-five percent (75%) of the votes
         which all the stockholders would be entitled to cast at any annual
         election of directors or class of directors shall be required to amend
         or repeal, or to adopt any provision inconsistent with, this Section
         1.11.


                                       6
<PAGE>   7

                              ARTICLE 2 - DIRECTORS

2.1      GENERAL POWERS. The business and affairs of the corporation shall be
         managed by or under the direction of a Board of Directors, who may
         exercise all of the powers of the corporation except as otherwise
         provided by law or the Certificate of Incorporation. In the event of a
         vacancy in the Board of Directors, the remaining directors, except as
         otherwise provided by law, may exercise the powers of the full Board
         until the vacancy is filled.

2.2      NUMBER; ELECTION AND QUALIFICATION. The number of directors which shall
         constitute the whole Board of Directors shall be determined by
         resolution of the stockholders or the Board of Directors, but in no
         event shall be less than three. The number of directors may be
         decreased at any time and from time to time by a majority of the
         directors then in office, but only to eliminate vacancies existing by
         reason of the death, resignation, removal or expiration of the term of
         one or more directors. The directors shall be elected at the annual
         meeting of stockholders by such stockholders as have the right to vote
         on such election. Directors need not be stockholders of the
         corporation.

2.3      CLASSES OF DIRECTORS. The Board of Directors shall be and is divided
         into three classes: Class I, Class II and Class III. No one class shall
         have more than one director more than any other class. If a fraction is
         contained in the quotient arrived at by dividing the authorized number
         of directors by three, then if such fraction is one-third, the extra
         director shall be a member of Class I and, if such fraction is two
         thirds, one of the extra directors shall be a member of Class I and the
         other extra director shall be a member of Class II, unless otherwise
         provided for from time to time by resolution adopted by a majority of
         the Board of Directors.

2.4      TERMS IN OFFICE. Each director shall serve for a term ending on the
         date of the third annual meeting following the annual meeting at which
         such director was elected; provided, however, that each initial
         director in Class I shall serve for a term ending on the date of the
         annual meeting next following the end of the corporation's fiscal year
         ending December 31, 1993; each initial director in Class II shall serve
         for a term ending on the date of the annual meeting next following the
         end of the corporation's fiscal year ending December 31, 1992; and each
         initial director in Class III shall serve for a term ending on the date
         of the annual meeting next following the end of the corporation's
         fiscal year ending December 31, 1991.

2.5      ALLOCATION OF DIRECTORS AMONG CLASS IN THE EVENT OF INCREASES OR
         DECREASES IN THE NUMBER OF DIRECTORS. In the event of any increase or
         decrease in the authorized number of directors, (i) each director then
         serving as such shall nevertheless continue as director of the class of
         which he is a member until the expiration of his current term or his
         prior death, retirement or resignation and (ii) the newly created or
         eliminated directorships resulting from such increase or decrease shall
         be apportioned by the Board of Directors among the three classes of
         directors so as to ensure that no one class has more than one director
         more than any other class. To the extent possible, consistent with the
         foregoing rule, any newly created directorships shall be added to those
         classes whose terms of office are to expire at the latest dates
         following such allocation, and any newly eliminated directorships shall
         be subtracted from those classes whose terms of office are to expire at
         the earliest dates following such allocation, unless otherwise provided



                                       7
<PAGE>   8
         for from time to time by resolution adopted by a majority of the
         directors then in office, although less than a quorum.

2.6      TENURE. Notwithstanding any provisions to the contrary contained
         herein, each director shall hold office until his successor is elected
         and qualified, or until his earlier death, resignation or removal.

2.7      VACANCIES. Unless and until filled by the stockholders, any vacancy in
         the Board of Directors, however occurring, including a vacancy
         resulting from an enlargement of the Board, may be filled by vote of a
         majority of the directors then in office, although less than a quorum,
         or by a sole remaining director. A director elected to fill a vacancy
         shall be elected for the unexpired term of his predecessor in office,
         and a director chosen to fill a position resulting from an increase in
         the number of directors shall hold office until the next annual meeting
         of stockholders and until his successor is elected and qualified, or
         until his earlier death, resignation or removal.

2.8      RESIGNATION. Any director may resign by delivering his written
         resignation to the corporation at its principal office or to the
         President or Secretary. Such resignation shall be effective upon
         receipt unless it is specified to be effective at some other time or
         upon the happening of some other event.

2.9      REGULAR MEETINGS. Regular meetings of the Board of Directors may be
         held without notice at such time and place, either within or without
         the State of Delaware, as shall be determined from time to time by the
         Board of Directors; provided that any director who is absent when such
         a determination is made shall be given notice of the determination. A
         regular meeting of the Board of Directors may be held without notice
         immediately after and at the same place as the annual meeting of
         stockholders.

2.10     SPECIAL MEETINGS. Special meetings of the Board of Directors may be
         held at any time and place, within or without the State of Delaware,
         designated in a call by the Chairman of the Board, President, two or
         more directors, or by one director in the event that there is only a
         single director in the office.

2.11     NOTICE OF SPECIAL MEETINGS. Notice of any special meeting of directors
         shall be given to each director by the Secretary or by the officer or
         one of the directors calling the meeting. Notice shall be duly given to
         each director (i) by giving notice to such director in person or by
         telephone at least 48 hours in advance of the meeting, (ii) by sending
         a telegram or telex or delivering written notice by hand, to his last
         known business or home address at least 48 hours in advance of the
         meeting, or (iii) by mailing written notice to his last known business
         or home address at least 72 hours in advance of the meeting. A notice
         or waiver of notice of a meeting of the Board of Directors need not
         specify the purposes of the meeting.

2.12     MEETINGS BY TELEPHONE CONFERENCE CALLS. Directors or any members of any
         committee designated by the directors may participate in a meeting of
         the Board of Directors or such committee by means of conference
         telephone or similar communications equipment by means of which all
         persons participating in the meeting can hear each other, and
         participation by such means shall constitute presence in person at such
         meeting.



                                       8
<PAGE>   9

2.13     QUORUM. A majority of the total number of the whole Board of Directors
         shall constitute a quorum at all meetings of the Board of Directors. In
         the event one or more of the directors shall be disqualified to vote at
         any meeting, then the required quorum shall be reduced by one for each
         such director so disqualified; provided, however, that in no case shall
         less than one-third (1/3) of the number so fixed constitute a quorum.
         In the absence of a quorum at any such meeting, a majority of the
         directors present may adjourn the meeting from time to time without
         further notice other than announcement at the meeting, until a quorum
         shall be present.

2.14     ACTION AT MEETING. At any meeting of the Board of Directors at which a
         quorum is present, the vote of a majority of those present shall be
         sufficient to take any action, unless a different vote is specified by
         law, the Certificate of Incorporation or these By-Laws.

2.15     ACTION BY CONSENT. Any action required or permitted to be taken at any
         meeting of the Board of Directors or of any committee of the Board
         Directors may be taken without a meeting, if all members of the Board
         or committee, as the case may be, consent to the action in writing, and
         the written consents are filed with the minutes of proceedings of the
         Board or committee.

2.16     REMOVAL. Any one or more or all of the directors may be removed, with
         or without cause, by the holders of at least seventy-five percent (75%)
         of the shares then entitled to vote at an election of directors.

2.17     COMMITTEES. The Board of Directors may, by resolution passed by a
         majority of the whole Board, designate one or more committees, each
         committee to consist of one or more of the directors of the
         corporation. The Board may designate one or more directors as alternate
         members of any committee, who may replace any absent or disqualified
         member at any meeting of the committee. In the absence or
         disqualification of a member of a committee, the member or members of
         the committee present at any meeting and not disqualified from voting,
         whether or not he or they constitute a quorum, may unanimously appoint
         another member of the Board of Directors to act at the meeting in the
         place of any such absent or disqualified member. Any such committee, to
         the extent provided in the resolution of the Board of Directors and
         subject to the provisions of the General Corporation Law of the State
         of Delaware, shall have and may exercise all the powers and authority
         of the Board of Directors in the management of the business and affairs
         of the corporation and may authorize the seal of the corporation to be
         affixed to all papers which may require it. Each such committee shall
         keep minutes and make such reports as the Board of Directors may from
         time to time request. Except as the Board of Directors may otherwise
         determine, any committee may make rules for the conduct of its
         business, but unless otherwise provided by the directors or in such
         rules, its business shall be conducted as nearly as possible in the
         same manner as is provided in these By-Laws for the Board of Directors.

2.18     COMPENSATION OF DIRECTORS. Directors may be paid such compensation for
         their services and such reimbursement for expenses of attendance at
         meetings as the Board of Directors may from time to time determine. No
         such payment shall preclude any director from serving the corporation
         or any of its parent or subsidiary corporations in any other capacity
         and receiving compensation for such service.



                                       9
<PAGE>   10

2.19     AMENDMENTS TO ARTICLE. Notwithstanding any other provisions of law, the
         Certificate of Incorporation or these By-Laws, and notwithstanding the
         fact that a lesser percentage may be specified by law, the affirmative
         vote of the holders of at least seventy-five percent (75%) of the votes
         which all the stockholders would be entitled to cast at any annual
         election of directors or class of directors shall be required to amend
         or repeal, or to adopt any provision inconsistent with, this Article 2.

                              ARTICLE 3 - OFFICERS

3.1      ENUMERATION. The officers of the corporation shall consist of a
         President, a Secretary, a Treasurer and such other officers with such
         other titles as the Board of Directors shall determine, including a
         Chairman of the Board, a Vice-Chairman of the Board, and one or more
         Vice Presidents, Assistant Treasurers, and Assistant Secretaries. The
         Board of Directors may appoint such other officers, as it may deem
         appropriate.

3.2      ELECTION. The President, Treasurer and Secretary shall be elected
         annually by the Board of Directors at its first meeting following the
         annual meeting of stockholders. Other officers may be appointed by the
         Board of Directors at such meeting or at any other meeting.

3.3      QUALIFICATION. No officer need be a stockholder. Any two or more
         offices may be held by the same person.

3.4      TENURE. Except as otherwise provided by law, by the Certificate of
         Incorporation or by these By-Laws, each officer shall hold office until
         his successor is elected and qualified, unless a different term is
         specified in the vote choosing or appointing him, or until his earlier
         death, resignation or removal.

3.5      RESIGNATION AND REMOVAL. Any officer may resign by delivering his
         written resignation to the corporation at its principal office or to
         the President or Secretary. Such resignation shall be effective upon
         receipt unless it is specified to be effective at some other time or
         upon the happening of some other event.

         Any officer may be removed at any time, with or without cause, by vote
         of a majority of the entire number of directors then in office.

         Except as the Board of Directors may otherwise determine, no officer
         who resigns or is removed shall have any right to any compensation as
         an officer for any period following his resignation or removal, or any
         right to damages on account of such removal, whether his compensation
         be by the month or by the year or otherwise, unless such compensation
         is expressly provided in a duly authorized written agreement with the
         corporation.

3.6      VACANCIES. The Board of Directors may fill any vacancy occurring in any
         office for any reason and may, in its discretion, leave unfilled for
         such period as it may determine any offices other than those of
         President, Treasurer and Secretary. Each such successor shall hold
         office for the unexpired term of his predecessor and until his
         successor is elected and qualified, or until his earlier death,
         resignation or removal.



                                       10
<PAGE>   11

3.7      CHAIRMAN OF THE BOARD AND VICE-CHAIRMAN OF THE BOARD. The Board of
         Directors may appoint a Chairman of the Board and may designate the
         Chairman of the Board as Chief Executive Officer. If the Board of
         Directors appoints a Chairman of the Board, he shall perform such
         duties and possess such powers as are assigned to him by the Board of
         Directors. If the Board of Directors appoints a Vice-Chairman of the
         Board, he shall, in the absence or disability of the Chairman of the
         Board, perform the duties and exercise the powers of the Chairman of
         the Board, and shall perform such other duties and possess such other
         powers as may from time to time be vested in him by the Board of
         Directors.

3.8      PRESIDENT. The President shall, subject to the direction of the Board
         of Directors, have general charge and supervision of the business of
         the corporation. Unless otherwise provided by the Board of Directors,
         he shall preside at all meetings of the stockholders, if he is a
         director, at all meetings of the Board of Directors. Unless the Board
         of Directors has designated the Chairman of the Board or another
         officer as Chief Executive Officer, the President shall be the Chief
         Executive Officer of the corporation. The President shall perform such
         other duties and shall have such other powers as the Board of Directors
         may from time to time prescribe.

3.9      VICE PRESIDENTS. Any Vice President shall perform such duties and
         possess such powers as the Board of Directors or the President may from
         time to time prescribe. In the event of the absence, inability or
         refusal to act of the President, the Vice President (or if there shall
         be more than one, the Vice Presidents in the order determined by the
         Board of Directors) shall perform the duties of the President and when
         so performing shall have all the powers of and be subject to all the
         restrictions upon the President. The Board of Directors may assign to
         any Vice President, the title of Executive Vice President, Senior Vice
         President or any other title selected by the Board of Directors.

3.10     SECRETARY AND ASSISTANT SECRETARIES. The Secretary shall perform such
         duties and shall have such powers as the Board of Directors or the
         President may from time to time prescribe. In addition, the Secretary
         shall perform such duties and have such powers as are incident to the
         office of the secretary, including without limitation the duty and
         power to give notices of all meetings of stockholders and special
         meetings of the Board of Directors, to attend all meetings of
         stockholders and the Board of Directors and keep a record of the
         proceedings, to maintain a stock ledger and prepare lists of
         stockholders and their addresses as required, to be custodian of
         corporate records and the corporate seal and to affix and attest to the
         same on documents.

         Any Assistant Secretary shall perform such duties and possess such
         powers as the Board of Directors, the President or the Secretary may
         from time to time prescribe. In the event of the absence, inability or
         refusal to act of the Secretary, the Assistant Secretary (or if there
         shall be more than one, the Assistant Secretaries in the order
         determined by the Board of Directors), shall perform the duties and
         exercise the powers of the Secretary.

         In the absence of the Secretary or any Assistant Secretary at any
         meeting of stockholders or directors, the person presiding at the
         meeting shall designate a temporary secretary to keep a record of the
         meeting.

3.11     TREASURER AND ASSISTANT TREASURERS. The Treasurer shall perform such
         duties and shall have such powers as may from time to time be assigned
         to him by the Board of Directors



                                       11
<PAGE>   12

         or the President. In addition, the Treasurer shall perform such duties
         and have such powers as are incident to the office of treasurer,
         including without limitation the duty and power to keep and be
         responsible for all funds and securities of the corporation, to deposit
         funds of the corporation in depositories selected in accordance with
         these By-Laws, to disburse such funds as ordered by the Board of
         Directors, to make proper accounts of such funds, and to render as
         required by the Board of Directors statements of all such transactions
         and of the financial condition of the corporation.

         The Assistant Treasurers shall perform such duties and possess such
         powers as the Board of Directors, the President or the Treasurer may
         from time to time prescribe. In the event of the absence, inability or
         refusal to act of the Treasurer, the Assistant Treasurer (or if there
         shall be more than one, the Assistant Treasurers in the order
         determined by the Board of Directors), shall perform the duties and
         exercise the powers of the Treasurer.

3.12     SALARIES. Officers of the corporation shall be entitled to such
         salaries, compensation or reimbursement as shall be fixed or allowed
         from time to time by the Board of Directors.

                            ARTICLE 4 - CAPITAL STOCK

4.1      ISSUANCE OF STOCK. Unless otherwise voted by the stockholders and
         subject to the provisions of the Certificate of Incorporation, the
         whole or any part of any unissued balance of the authorized capital
         stock of the corporation or the whole or any part of any unissued
         balance of the authorized capital stock of the corporation held in its
         treasury may be issued, sold, transferred or otherwise disposed of by
         vote of the Board of Directors in such manner, for such consideration
         and on such terms as the Board of Directors may determine.

4.2      CERTIFICATES OF STOCK. Every holder of stock of the corporation shall
         be entitled to have a certificate, in such form as may be prescribed by
         law and by the Board of Directors, certifying the number and class of
         shares owned by him in the corporation. Each such certificate shall be
         signed by, or in the name of the corporation by, the Chairman or
         Vice-Chairman, if any, of the Board of Directors, or the President or a
         Vice President, and the Treasurer or an Assistant Treasurer, or the
         Secretary or an Assistant Secretary of the corporation. Any or all of
         the signatures on the certificate may be a facsimile.

         Each certificate for shares of stock which are subject to any
         restriction on transfers pursuant to the Certificate of Incorporation,
         the By-Laws, applicable securities laws or any agreement among any
         number of shareholders or among such holders and the corporation shall
         have conspicuously noted on the face or back of the certificate either
         the full text of the restriction or a statement of the existence of
         such restriction.

4.3      TRANSFERS. Except as otherwise established by rules and regulations
         adopted by the Board of Directors, and subject to applicable law,
         shares of stock may be transferred on the books of the corporation by
         the surrender to the corporation or its transfer agent of the
         certificate representing such shares properly endorsed or accompanied
         by a written assignment or power of attorney properly executed, and
         with such proof of authority or the authenticity of signature as the
         corporation or its transfer agent may reasonably require. Except as may
         be otherwise required by law, by the Certificate of Incorporation or by
         these By-Laws, the corporation shall be entitled to treat the record



                                       12
<PAGE>   13
         holder of stock as shown on its books as the owner of such stock for
         all purposes, including the payment of dividends and the right to vote
         with respect to such stock, regardless of any transfer, pledge or other
         disposition of such stock until the shares have been transferred on the
         books of the corporation in accordance with the requirements of these
         By-Laws.

4.4      LOST, STOLEN OR DESTROYED CERTIFICATES. The corporation may issue a new
         certificate of stock in place of any previously issued certificate
         alleged to have been lost, stolen, or destroyed, upon such terms and
         conditions as the Board of Directors may prescribe, including the
         presentation of reasonable evidence of such loss, theft or destruction
         and the giving of such indemnity as the Board of Directors may require
         for the protection of the corporation or any transfer agent or
         registrar.

4.5      RECORD DATE. The Board of Directors may fix in advance a date as a
         record date for the determination of the stockholders entitled to
         notice of or to vote at any meeting of stockholders or to express
         consent (or dissent) to corporate action in writing without a meeting,
         or entitled to receive payment of any dividend or other distribution or
         allotment of any rights in respect of any change, conversion or
         exchange of stock, or for the purpose of any other lawful action. Such
         record date shall not be more than 60 nor less than 10 days before the
         date of such meeting, nor more than 60 days prior to any other action
         to which such record date relates.

         If no record date is fixed, the record date for determining
         stockholders entitled to notice of or to vote at a meeting of
         stockholders shall be at the close of business on the day before the
         day on which notice is given, or, if notice is waived, at the close of
         business on the day before the day on which the meeting is held. The
         record date for determining stockholders entitled to express consent to
         corporate action in writing without a meeting, when no prior action by
         the Board of Directors is necessary, shall be the day on which the
         first written consent is expressed. The record date for determining
         stockholders for any other purpose shall be at the close of business on
         the day on which the Board of Directors adopts the resolution relating
         to such purpose.

         A determination of stockholders of record entitled to notice of or to
         vote at a meeting of stockholders shall apply to any adjournment of the
         meeting; provided, however, that the Board of Directors may fix a new
         record date for the adjourned meeting.

                         ARTICLE 5 - GENERAL PROVISIONS

5.1      FISCAL YEAR. Except as from time to time otherwise designated by the
         Board of Directors, the fiscal year of the corporation shall begin on
         the first day of January in each year and end on the last day of
         December in each year.

5.2      CORPORATE SEAL. The corporate seal shall be in such form as shall be
         approved by the Board of Directors.

5.3      WAIVER OF NOTICE. Whenever any notice whatsoever is required to be
         given by law, by the Certificate of Incorporation or by these By-Laws,
         a waiver of such notice either in writing signed by the person entitled
         to such notice or such person's duly authorized attorney, or by



                                       13
<PAGE>   14
         telegraph, cable or any other available method, whether before, at or
         after the time stated in such waiver, or the appearance of such person
         or persons at such meeting in person or by proxy, shall be deemed
         equivalent to such notice.

5.4      VOTING OF SECURITIES. Except as the directors may otherwise designate,
         the President or Treasurer may waive notice of, and act as, or appoint
         any person or persons to act as, proxy or attorney-in-fact for this
         corporation (with or without power of substitution) at, any meeting of
         stockholders or shareholders of any other corporation or organization,
         the securities of which may be held by this corporation.

5.5      EVIDENCE OF AUTHORITY. A certificate by the Secretary, or an Assistant
         Secretary, or a temporary Secretary, as to any action taken by the
         stockholders, directors, a committee or any officer or representative
         of the corporation shall as to all persons who rely on the certificate
         in good faith be conclusive evidence of such action.

5.6      CERTIFICATE OF INCORPORATION. All references in these By-Laws to the
         Certificate of Incorporation shall be deemed to refer to the
         Certificate of Incorporation of the corporation, as amended and in
         effect from time to time.

5.7      TRANSACTIONS WITH INTERESTED PARTIES. No contract or transaction
         between the corporation and one or more of the directors or officers,
         or between the corporation and any other corporation, partnership,
         association, or other organization in which one or more of the
         directors or officers are directors or officers, or have a financial
         interest, shall be void or voidable solely for this reason, or solely
         because the director or officer is present at or participates in the
         meeting of the Board of Directors or a committee of the Board of
         Directors which authorizes the contract or transaction or solely
         because his or their votes are counted for such purpose, if:

                  (1)      The material facts as to his relationship or interest
                           and as to the contract or transaction are disclosed
                           or are known to the Board of Directors or the
                           committee, and the Board or committee in good faith
                           authorizes the contract or transaction by the
                           affirmative votes of a majority of the disinterested
                           directors, even though the disinterested directors be
                           less than a quorum;

                  (2)      The material facts as to his relationship or interest
                           and as to the contract or transaction are disclosed
                           or are known to the stockholders entitled to vote
                           thereon, and the contract or transaction is
                           specifically approved in good faith by vote of the
                           stockholders; or

                  (3)      The contract or transaction is fair as to the
                           corporation as of the time it is authorized, approved
                           or ratified, by the Board of Directors, a committee
                           of the Board of Directors, or the stockholders.

         Common or interested directors may be counted in determining the
         presence of a quorum at a meeting of the Board of Directors or of a
         committee which authorizes the contract or transaction.



                                       14
<PAGE>   15

5.8      SEVERABILITY. Any determination that any provision of these By-Laws is
         for any reason inapplicable, illegal or ineffective shall not affect or
         invalidate any other provision of these By-Laws.

5.9      PRONOUNS. All pronouns used in these By-Laws shall be deemed to refer
         to the masculine, feminine or neuter, singular or plural, as the
         identity of the person or persons may require.

                             ARTICLE 6 - AMENDMENTS

6.1      BY THE BOARD OF DIRECTORS. Except as is otherwise set forth in these
         By-Laws, these By-Laws may be altered, amended or repealed or new
         by-laws may be adopted by the affirmative vote of a majority of the
         directors present at any regular or special meeting of the Board of
         Directors at which a quorum is present.

6.2      BY THE STOCKHOLDERS. Except as otherwise set forth in these By-Laws,
         these By-Laws may be altered, amended or repealed or new by-laws may be
         adopted by the affirmative vote of the holders of a majority of the
         shares of the capital stock of the corporation issued and outstanding
         and entitled to vote at any regular meeting of stockholders, or at any
         special meeting of stockholders, provided notice of such alteration,
         amendment, repeal or adoption of new by-laws shall have been stated in
         the notice of such special meeting.





                                       15

<PAGE>   1
                                                                    Exhibit 10.2

                            IDEXX LABORATORIES, INC.

                             1991 STOCK OPTION PLAN

                              (AS OF JULY 21, 1999)

1.      PURPOSE.

        The purpose of this plan (the "Plan") is to secure for IDEXX
Laboratories, Inc. (the "Company") and its shareholders the benefits arising
from capital stock ownership by employees, officers and directors of, and
consultants or advisors to, the Company and its parent and subsidiary
corporations who are expected to contribute to the Company's future growth and
success. Except where the context otherwise requires, the term "Company" shall
include the parent and all present and future subsidiaries of the Company as
defined in Sections 424(e) and 424(f) of the Internal Revenue Code of 1986, as
amended or replaced from time to time (the "Code"). Those provisions of the Plan
which make express reference to Section 422 of the Code shall apply only to
Incentive Stock Options (as that term is defined in the Plan).

2.      TYPE OF OPTIONS AND ADMINISTRATION.

        (a) TYPES OF OPTIONS. Options granted pursuant to the Plan shall be
authorized by action of the Board of Directors of the Company (or a Committee
designated by the Board of Directors) and may be either incentive stock options
("Incentive Stock Options") meeting the requirements of Section 422 of the Code
or non-qualified options which are not intended to meet the requirements of
Section 422 of the Code.

        (b) ADMINISTRATION. The Plan will be administered by the Board of
Directors of the Company, whose construction and interpretation on the terms and
provisions of the Plan shall be final and conclusive. The Board of Directors may
in its sole discretion grant options to purchase shares of the Company's Common
Stock, par value $.10 per share ("Common Stock"), and issue shares upon exercise
of such options as provided in the Plan. The Board shall have authority, subject
to the express provisions of the Plan, to construe the respective option
agreements and the Plan, to prescribe, amend and rescind rules and regulations
relating to the Plan, to determine the terms and provisions of the respective
options agreements, which need not be identical, and to make all other
determinations in the judgment of the Board of Directors necessary or desirable
for the administration of the Plan. The Board of Directors may correct any
defect or supply any omission or reconcile any inconsistency in the Plan or in
any option agreement in the manner and to the extent it shall deem expedient to
carry the Plan into effect and it shall be the sole and final judge of such
expediency. No director or person acting pursuant to authority delegated by the
Board of Directors shall be liable for any action or determination made in good
faith. The Board of Directors may, to the full extent permitted by or consistent
with applicable laws or regulations (including, without limitation, applicable
state law and Rule 16b-3 promulgated under the Securities Exchange Act of 1934
(the "Exchange Act"), or any successor rule ("Rule 16b-3")), delegate any or all
of its powers under the Plan to a committee (the "Committee") appointed by the
Board of Directors, and if the Committee is so appointed all references to the
Board of Directors in the Plan shall mean and relate to such Committee.

        (c) APPLICABILITY OF RULE 16b-3. Those provisions of the Plan which make
express reference to Rule 16b-3 shall apply to the Company only at such time as
the Company's Common Stock or another class of equity security is registered
under the Exchange Act, and then only to such persons as are required to file
reports under Section 16(a) of the Exchange Act.

3.      ELIGIBILITY.

         (a) GENERAL. Options may be granted to persons who are, at the time of
grant, employees or officers of, or consultants or advisors to, the Company;
PROVIDED, that Incentive Stock Options may be granted only to persons who are
eligible to receive such options under Section 422 of the Code. In addition, no
person shall be granted any Incentive Stock Option under the Plan who, at the
time such option is granted, owns, directly or indirectly, stock possessing more
than 10% of the total combined voting power of all classes of stock of the
Company, unless the requirements of Section 11(b) are satisfied. The attribution



                                      -1-
<PAGE>   2
of stock ownership provisions of Section 424(d) of the Code, and any successor
provisions thereto, shall be applied in determining the shares of stock owned by
a person for purposes of applying the foregoing percentage limitation. A person
who has been granted an option may, if he or she is otherwise eligible, be
granted an additional option or options if the Board of Directors shall so
determine. Subject to adjustment as provided in Section 15 below, the maximum
number of shares with respect to which options may be granted to any employee
under the Plan shall not exceed 1,000,000 shares of common stock during any one
calendar year. For the purpose of calculating such maximum number, (a) an option
shall continue to be treated as outstanding notwithstanding its repricing,
cancellation, or expiration and (b) the repricing of an outstanding option or
the issuance of a new option in substitution for a cancelled option shall be
deemed to constitute the grant of a new additional option separate from the
original grant of the option that is repriced or cancelled.

        (b) GRANT OF OPTIONS TO DIRECTORS AND OFFICERS. From and after the
registration of the Common Stock of the Company under the Exchange Act, the
selection of a director or an officer (as the terms "director" and "officer" are
defined for the purposes of Rule 16b-3) as a recipient of an option, the timing
of the option grant, the exercise price of the option and the number of shares
subject to the option shall be determined either (i) by the Board of Directors,
of which all members shall be "disinterested persons" (as hereinafter defined),
or (ii) by a committee of two or more directors having full authority to act in
the matter, of which all members shall be "disinterested persons". For the
purposes of the Plan, a director shall be deemed to be a "disinterested person"
only is such person qualifies as a "disinterested person" within the meaning of
Rule 16b-3, as such term is interpreted from time to time.

4.      STOCK SUBJECT TO PLAN.

        Subject to adjustment as provided in Section 15 below, the maximum
number of shares of Common Stock of the Company which may be issued and sold
under the Plan is 6,475,000 shares. Such shares may be authorized and unissued
shares or may be shares issued and thereafter acquired by the Company. If an
option granted under the Plan shall expire or terminate for any reason without
having been exercised in full, the unpurchased shares subject to such option
shall again be available for subsequent option grants under the Plan. If shares
issued upon exercise of an option under the Plan are tendered to the Company in
payment of the exercise price of an option granted under the Plan, such tendered
shares shall again be available for subsequent option grants under the Plan;
provided, that in no event shall (i) the total number of shares issued pursuant
to the exercise of Incentive Stock Options under the Plan, on a cumulative
basis, exceed the maximum number of shares authorized for issuance under the
Plan exclusive of shares made available for issuance pursuant to this sentence
or (ii) the total number of shares issued pursuant to the exercise of options by
persons who are required to file reports under Section 16(a) of the Exchange
Act, on a cumulative basis, exceed the maximum number of shares authorized for
issuance under the Plan exclusive of shares made available for issuance pursuant
to this sentence.

5.      FORMS OF OPTION AGREEMENTS.

        As a condition to the grant of an option under the Plan, each recipient
of an option shall execute an option agreement in such form not inconsistent
with the Plan as may be approved by the Board of Directors. Each option
agreement shall specifically state whether the options granted thereby are
intended to be Incentive Stock Options or non-qualified options. Such option
agreements may differ among recipients.

6.      PURCHASE PRICE.

        (a) GENERAL. The purchase price per share of stock deliverable upon the
exercise of an option shall be determined by the Board of Directors, PROVIDED,
HOWEVER, that the exercise price shall not be less than 100% of the fair market
value of such stock, as determined by the Board of Directors, at the time of
grant of such option, or less than 110% of such fair market value in the case of
options described in Section 11(b).

        (b) PAYMENT OF PURCHASE PRICE. Options granted under the Plan may
provide for the payment of the exercise price by delivery of cash or a check to
the order of the Company in an amount equal to the exercise price of such
options, or, to the extent provided in the applicable option agreement, (i) by
delivery to the Company of shares of Common Stock of the Company already owned
by the optionee having a fair market value equal in amount to the exercise price
of the options being exercised, (ii) by any other means which the Board of
Directors determines are consistent with the purpose of the Plan and with the
applicable laws and regulations (including, without limitation, the provisions
of Rule 16b-3 and Regulation T promulgated by the Federal Reserve Board) or
(iii) by any combination of such methods of payment. The fair market value of



                                      -2-
<PAGE>   3
any shares of the Company's Common Stock or other non-cash consideration which
may be delivered upon exercise of an option shall be determined by the Board of
Directors.

7.      OPTION PERIOD.

        Each option and all rights thereunder shall expire on such date as the
Board of Directors shall determine, except that (i) in the case of an Incentive
Stock Option, such date shall not be later than ten years after the date on
which the option is granted, (ii) in the case of an Incentive Stock Option
described in Section 11(b), such date shall not be later than five years after
the date on which the option is granted and (iii) in all cases, options shall be
subject to earlier termination as provided in the Plan.

8.      EXERCISE OF OPTIONS.

        Each option granted under the Plan shall be exercisable either in full
or in installments at such time or times and during such period as shall be set
forth in the agreement evidencing such option, subject to the provisions of the
Plan.

9.      NONTRANSFERABILITY OF OPTIONS.

        Incentive Stock Options shall not be assignable or transferable by the
person to whom they are granted, either voluntarily or by operation of law,
except by will or the laws of decent and distribution, and, during the life of
the optionee, shall be exercisable only by the optionee. With the approval of
the Board of Directors, non-qualified stock options may be transferred by gift
to (i) one or more members of the optionee's family or entities controlled by,
or for the benefit of the optionee or such family members, or (ii) one or more
charitable organizations (including charitable trusts). Except as the Board of
Directors may otherwise determine, no option or interest therein may be
transferred, assigned, pledged or hypothecated by the optionee during his
lifetime, whether by operation of law or otherwise, or be made subject to
execution, attachment or similar process.

10.     EFFECT OF TERMINATION OF EMPLOYMENT OR OTHER RELATIONSHIP.

        Except as provided in Section 11(d) with respect to Incentive Stock
Options, the Board of Directors shall determine the period of time during which
an optionee may exercise an option following (i) the termination of the
optionee's employment or other relationship with the Company or (ii) the death
or disability of the optionee. Such periods shall be set forth in the agreement
evidencing such option.

11.     INCENTIVE STOCK OPTIONS.

        Options granted under the Plan which are intended to be Incentive Stock
Options shall be subject to the following additional terms and conditions:

        (a) EXPRESS DESIGNATION. All Incentive Stock Options granted under the
Plan shall, at the time of grant, be specifically designated as such in the
option agreement covering such Incentive Stock Options.

        (b) 10% STOCKHOLDER. If any employee to whom an Incentive Stock Option
is to be granted under the Plan is, at the time of the grant of such option, the
owner of stock possessing more than 10% of the total combined voting power of
all classes of stock of the Company (after taking into account the attribution
of stock ownership rules of Section 424(d) of the Code), then the following
special provisions shall be applicable to the Incentive Stock Option granted to
such individual:

              (i) the purchase price per share of the Common Stock subject to
        such Incentive Stock Option shall not be less than 110% of the fair
        market value of one share of Common Stock at the time of grant; and

              (ii) the option exercise period shall not exceed five years from
        the date of grant.

        (c) DOLLAR LIMITATION. For so long as the Code shall so provide, options
granted to any employee under the Plan (and any other incentive stock option
plans of the Company) which are intended to constitute Incentive Stock Options
shall not constitute Incentive Stock Options to the extent that such options, in
the aggregate, become exercisable for the first time in any one calendar year
for shares of Common Stock with an aggregate fair market value (determined as of
the respective date or dates of grant) of more than $100,000.


                                      -3-
<PAGE>   4

        (d) TERMINATION OF EMPLOYMENT, DEATH OR DISABILITY. No Incentive Stock
Option may be exercised unless, at the time of such exercise, the optionee is,
and has been continuously since the date of grant of his or her option, employed
by the Company, except that:

              (i) an Incentive Stock Option may be exercised within the period
        of three months after the date the optionee ceases to be an employee of
        the Company (or within such lesser period as may be specified in the
        applicable option agreement), provided, that the agreement with respect
        to such option may designate a longer exercise period and that the
        exercise after such three-month period shall be treated as the exercise
        of a non-qualified option under the Plan;

              (ii) if the optionee dies while in the employ of the Company, or
        within three months after the optionee ceases to be such an employee,
        the Incentive Stock Option may be exercised by the person to whom it is
        transferred by will or the laws of descent and distribution within the
        period of one year after the date of death (or within such lesser period
        as may be specified in the applicable option agreement); and

              (iii) if the optionee becomes disabled (within the meaning of
        Section 22(e)(3) of the Code or any successor provision thereto) while
        in the employ of the Company, the Incentive Stock Option may be
        exercised within the period of one year after the date the optionee
        ceases to be such an employee because of such disability (or within such
        lesser period as may be specified in the applicable option agreement).

        For all purposes of the Plan and any option granted hereunder,
"employment" shall be defined in accordance with the provisions of Section
1.421-7(h) of the Income Tax Regulations (or any successor regulations).
Notwithstanding the foregoing provisions, no Incentive Stock Option may be
exercised after its expiration date.

12.     ADDITIONAL PROVISIONS.

        (a) ADDITIONAL OPTION PROVISIONS. The Board of Directors may, in its
sole discretion, include additional provision in any option agreement covering
options granted under the Plan, including without limitation restrictions on
transfer, repurchase rights, commitments to pay cash bonuses, to make, arrange
for or guaranty loans or to transfer other property to optionees upon exercise
of options, or such other provisions as shall be determined by the Board of
Directors; PROVIDED THAT such additional provisions shall not be inconsistent
with any other term or condition of the Plan and such additional provisions
shall not cause any Incentive Stock Option granted under the Plan to fail to
qualify as an Incentive Stock Option within the meaning of Section 422 of the
Code.

        (b) ACCELERATION, EXTENSION, ETC. The Board of Directors may, in its
sole discretion, (i) accelerate the date or dates on which all or any particular
option or options granted under the Plan may be exercised or (ii) extend the
dates during which all, or any particular option or options granted under the
Plan may be exercised; provided, however, that no such extension shall be
permitted if it would cause the Plan to fail to comply with Section 422 of the
Code or with Rule 16b-3.

13.     GENERAL RESTRICTIONS.

        (a) INVESTMENT REPRESENTATIONS. The Company may require any person to
whom an option is granted, as a condition of exercising such option, to give
written assurances in substance and form satisfactory to the Company to the
effect that such person is acquiring the Common Stock subject to the option for
his or her own account for investment and not with any present intention of
selling or otherwise distributing the same, and to such other effects as the
Company deems necessary or appropriate in order to comply with federal and
applicable state securities laws, or with covenants or representations made by
the Company in connection with any public offering of its Common Stock.

        (b) COMPLIANCE WITH SECURITIES LAWS. Each option shall be subject to the
requirement that if, at any time, counsel to the Company shall determine that
the listing, registration or qualification of the shares subject to such option
upon any securities exchange or under any state or federal law, or the consent
or approval of any governmental or regulatory body, or that the disclosure of
non-public information or the satisfaction of any other condition is necessary
as a condition of, or in connection with, the issuance or purchase of shares
thereunder, such option may not be exercised, in whole or in part, unless such
listing, registration, qualification, consent or approval, or satisfaction of
such condition shall have been effected or obtained on conditions acceptable to
the Board of Directors. Nothing herein shall be deemed to require the Company to
apply for or to obtain such listing, registration or qualification, or to
satisfy such condition.


                                      -4-
<PAGE>   5

14.     RIGHTS AS A SHAREHOLDER.

        The holder of an option shall have no rights as a shareholder with
respect to any shares covered by the option (including, without limitation, any
rights to receive dividends or non-cash distributions with respect to such
shares) until the date of issue of a stock certificate to him or her for such
shares. No adjustment shall be made for dividends or other rights for which the
record date is prior to the date such stock certificate is issued.

15.     ADJUSTMENT PROVISIONS FOR RECAPITALIZATIONS AND RELATED TRANSACTIONS.

        (a) GENERAL. If, through or as a result of any merger, consolidation,
sale of all or substantially all of the assets of the Company, reorganization,
recapitalization, reclassification, stock dividend, stock split, reverse stock
split, or other similar transaction, (i) the outstanding shares of Common Stock
are increased or decreased or are exchanged for a different number or kind of
shares or other securities of the Company, or (ii) additional shares or new or
different shares or other securities of the Company or other non-cash assets are
distributed with respect to such shares of Common Stock or other securities, an
appropriate and proportionate adjustment may be made in (x) the maximum number
and kind of shares reserved for issuance under the Plan, (y) the number and kind
of shares or other securities subject to then outstanding options under the
Plan, and (z) the price for each share subject to any then outstanding options
under the Plan, without changing the aggregate purchase price as to which such
options remain exercisable, provided that no adjustment shall be made pursuant
to this Section 15 if such adjustment would cause the Plan to fail to comply
with Section 422 of the Code or with Rule 16b-3.

        (b) BOARD AUTHORITY TO MAKE ADJUSTMENTS. Any adjustments under this
Section 15 will be made by the Board of Directors, whose determination as to
what adjustments, if any, will be made and the extent thereof will be final,
binding and conclusive. No fractional shares will be issued under the Plan on
account of any such adjustments.

16.     MERGER, CONSOLIDATION, ASSET SALE, LIQUIDATION, ETC.

        (a) GENERAL. In the event of a consolidation or merger or sale of all or
substantially all of the assets of the Company in which outstanding shares of
Common Stock are exchanged for securities, cash or other property of any other
corporation or business entity or in the event of a liquidation of the Company,
the Board of Directors of the Company, or the board of directors of any
corporation assuming the obligations of the Company, may, in its discretion,
take any one or more of the following actions, as to outstanding options: (i)
provide that such options shall be assumed, or equivalent options shall be
substituted, by the acquiring or succeeding corporation (or an affiliate
thereof), PROVIDED that any such options substituted for Incentive Stock Options
shall meet the requirements of Section 425(a) of the Code, (ii) upon written
notice to the optionees, provide that all unexercised options will terminate
immediately prior to the consummation of such transaction unless exercised by
the optionee within a specified period following the date of such notice, (iii)
in the event of a merger under the terms of which holders of the Common Stock of
the Company will receive upon consummation thereof a cash payment for each share
surrendered in the merger (the "Merger Price"), make or provide for a cash
payment to the optionees equal to the difference between (A) the Merger Price
times the number of shares of Common Stock subject to such outstanding options
(to the extent then exercisable at prices not in excess of the Merger Price) and
(B) the aggregate exercise price of all such outstanding options in exchange for
the termination of such options, and (iv) provide that all or any outstanding
options shall become exercisable in full immediately prior to such event.

        (b) SUBSTITUTE OPTIONS. The Company may grant options under the Plan in
substitution for options held by employees of another corporation who become
employees of the Company, or a subsidiary of the Company, as the result of a
merger or consolidation of the employing corporation with the Company or a
subsidiary of the Company, or as a result of the acquisition by the Company, or
one of its subsidiaries, of property or stock of the employing corporation. The
Company may direct that substitute options be granted on such terms and
conditions as the Board of Directors considers appropriate in the circumstances.

17.     NO SPECIAL EMPLOYMENT RIGHTS.

        Nothing contained in the Plan or in any option shall confer upon any
optionee any right with respect to the continuation of his or her employment by
the Company or interface in any way with the right of the Company at any time to
terminate such employment or to increase or decrease the compensation of the
optionee.


                                      -5-
<PAGE>   6


18.     OTHER EMPLOYEE BENEFITS.

        Except as to plans which by their terms include such amounts as
compensation, the amount of any compensation deemed to be received by an
employee as a result of the exercise of an option or the sale of shares received
upon such exercise will not constitute compensation with respect to which any
other employee benefits of such employee are determined, including, without
limitation, benefits under any bonus, pension, profit-sharing, life insurance or
salary continuation plan, except as otherwise specifically determined by the
Board of Directors.

19.     AMENDMENT OF THE PLAN.

        (a) The Board of Directors may at any time, and from time to time,
modify or amend the Plan in any respect, except that if at any time the approval
of the shareholders of the Company is required under Section 422 of the Code or
any successor provision with respect to Incentive Stock Options or under Rule
16b-3 or with respect to options held by persons who are required to file
reports pursuant to Section 16(a) of the Exchange Act, the Board of Directors
may not effect such modification or amendment without such approval. In
addition, the Board of Directors may not amend Section 24 of the Plan without
the prior approval of the shareholders of the Company.

        (b) The termination or any modification or amendment of the Plan shall
not, without the consent of an optionee, affect his or her rights under an
option previously granted to him or her. With the consent of the optionee
affected, the Board of Directors may amend outstanding option agreements in a
manner not inconsistent with the Plan. The Board of Directors shall have the
right to amend or modify (i) the terms and provisions of the Plan and of any
outstanding Incentive Stock Options granted under the Plan to the extent
necessary to qualify any or all such options for such favorable federal income
tax treatment (including deferral of taxation upon exercise) as may be afforded
incentive stock options under Section 422 of the Code and (ii) the terms and
provisions of the Plan and of any outstanding option to the extent necessary to
ensure the qualification of the Plan under Rule 16b-3.

20.     WITHHOLDING.

        (a) The Company shall have the right to deduct from payments of any kind
otherwise due to the optionee any federal, state or local taxes of any kind
required by law to be withheld with respect to any shares issued upon exercise
of options under the Plan. Subject to the prior approval of the Company, which
may be withheld by the Company in its sole discretion, the optionee may elect to
satisfy such obligations, in whole or in part, (i) by causing the Company to
withhold shares of Common Stock otherwise issuable pursuant to the exercise of
an option or (ii) by delivering to the Company shares of Common Stock already
owned by the optionee. The shares so delivered or withheld shall have a fair
market value equal to such withholding obligation. The fair market value of the
shares used to satisfy such withholding obligation shall be determined by the
Company as of the date that the amount of tax to be withheld is to be
determined. An optionee who has made an election pursuant to this Section 20(a)
may only satisfy his or her withholding obligation with shares of Common Stock
which are not subject to any repurchase, forfeiture, unfulfilled vesting or
other similar requirements.

        (b) Notwithstanding the foregoing, in the case of a director or officer,
no election to use shares for the payment of withholding taxes shall be
effective unless made in compliance with any applicable requirements of Rule
16b-3.

21.     CANCELLATION AND NEW GRANT OF OPTIONS, ETC.

        The Board of Directors shall have the authority to effect, at any time
and from time to time, with the consent of the affected optionees, (i) the
cancellation of any or all outstanding options under the Plan and the grant in
substitution therefor of new options under the Plan covering the same or
different numbers of shares of Common Stock and having an option exercise price
per share which may be lower or higher than the exercise price per share of the
cancelled options or (ii) the amendment of the terms of any and all outstanding
options under the Plan to provide an option exercise price per share which is
higher or lower that the then-current exercise price per share of such
outstanding options.

22.     EFFECTIVE DATE AND DURATION OF THE PLAN.

        (a) EFFECTIVE DATE. The Plan shall become effective when adopted by the
Board of Directors, but no Incentive Stock Option granted under the Plan shall
become exercisable unless and until the Plan shall have been approved by the
Company's shareholders. If such shareholder approval is not obtained within



                                      -6-
<PAGE>   7
twelve months after the date of the Board's adoption of the Plan, no options
previously granted under the Plan shall be deemed to be Incentive Stock Options
and no further Incentive Stock Options shall be granted. Amendments to the Plan
not requiring shareholder approval shall become effective when adopted by the
Board of Directors; amendments requiring shareholder approval (as provided in
Section 19) shall become effective when adopted by the Board of Directors, but
no Incentive Stock Option granted after the date of such amendment shall become
exercisable (to the extent that such amendment to the Plan was required to
enable the Company to grant such Incentive Stock Option to a particular
optionee) unless and until such amendment shall have been approved by the
Company's shareholders. If such shareholder approval is not obtained within
twelve months of the Board's adoption of such amendment, any Incentive Stock
Options granted on or after the date of such amendment shall terminate to the
extent that such amendment to the Plan was required to enable the Company to
grant such option to a particular optionee. Subject to this limitation, options
may be granted under the Plan at any time after the effective date and before
the date fixed for termination of the Plan.

        (b) TERMINATION. Unless sooner terminated in accordance with Section 16,
the Plan shall terminate, with respect to Incentive Stock Options, upon the
earlier of (i) the close of business on the day next preceding the tenth
anniversary of the date of its adoption by the Board of Directors, or (ii) the
date on which all shares available for issuance under the Plan shall have been
issued pursuant to the exercise or cancellation of options granted under the
Plan. Unless sooner terminated in accordance with Section 16, the Plan shall
terminate with respect to options which are not Incentive Stock Options on the
date specified in (ii) above. If the date of termination is determined under (i)
above, then options outstanding on such date shall continue to have force and
effect in accordance with the provisions of the instruments evidencing such
options.

23.     PROVISIONS FOR FOREIGN PARTICIPANTS.

        The Board of Directors may, without amending the Plan, modify awards or
options granted to participants who are foreign nationals or employed outside
the United States to recognize differences in laws, rules, regulations or
customs of such foreign jurisdictions with respect to tax, securities, currency,
employee benefit or other matters.

24.      PROHIBITION ON REPRICING OF OPTIONS.

        Neither the Board of Directors nor the Company may amend the terms of
any issued and outstanding option to reduce the exercise price, other than
pursuant to Section 15 of the Plan, without prior approval of shareholders of
the Company.

Adopted by the Board of Directors on April 24, 1991; adopted by Stockholders on
June 10, 1991.

Amended by the Board of Directors on February 12, 1992; amendment approved by
Stockholders on May 1, 1992.

Amended by the Board of Directors on February 26, 1993; amendment approved by
Stockholders on May 18, 1993.

Number of shares covered by the Plan reflects 2 for 1 stock split in the form of
a stock dividend paid on October 1, 1993.

Amended by the Board of Directors on February 9, 1995; amendment approved by
Stockholders on May 26, 1995.

Number of shares covered by the Plan reflects 2 for 1 stock split in the form of
a stock dividend paid on June 5, 1995.

Amended by the Board of Directors on March 5, 1996; amendment approved by the
Stockholders on May 24, 1996.

Amended by the Board of Directors on February 17, 1999.

Amended by the Board of Directors on July 21, 1999.


                                      -7-

<PAGE>   1
                                                                    Exhibit 10.3

                            IDEXX LABORATORIES, INC.

                           1991 DIRECTOR OPTION PLAN

                             (AS OF JULY 21, 1999)

        1.     PURPOSE

               The purpose of this 1991 Director Option Plan (the "Plan") of
IDEXX Laboratories, Inc. (the "Company") is to encourage ownership in the
Company by outside directors of the Company whose continued services are
considered essential to the Company's future progress and to provide them with a
further incentive to remain as directors of the Company.

        2.     ADMINISTRATION

               The Board of Directors shall supervise and administer the Plan.
Grants of stock options under the Plan and the amount and nature of the awards
to be granted shall be automatic in accordance with Section 5. However, all
questions of interpretation of the Plan or of any options issued under it shall
be determined by the Board of Directors and such determination shall be final
and binding upon all persons having an interest in the Plan.

        3.     PARTICIPATION IN THE PLAN

               Directors of the Company who are not employees of the Company or
any subsidiary of the Company shall be eligible to participate in the Plan.

        4.     STOCK SUBJECT TO THE PLAN

               (a) The maximum number of shares which may be issued under the
Plan shall be 500,000 shares of the Company's Common Stock, par value $.10 per
share ("Common Stock"), subject to adjustment as provided in Section 9 of the
Plan.

               (b) If any outstanding option under the Plan for any reason
expires or is terminated without having been exercised in full, the shares
allocable to the unexercised portion of such option shall again become available
for grant pursuant to the Plan.

               (c) All options granted under the Plan shall be non-statutory
options not entitled to special tax treatment under Section 422 of the Internal
Revenue Code of 1986, as amended to date and as it may be amended from time to
time (the "Code").

        5.     TERMS, CONDITIONS AND FORM OF OPTIONS

               Each option granted under the Plan shall be evidenced by a
written agreement in such form as the Board of Directors shall from time to time
approve, which agreements shall comply with and be subject to the following
terms and conditions:

               (a) OPTION GRANT DATES. Options shall be granted (i) to all
eligible directors who are directors as of April 24, 1991 on each date that he
or she is re-elected as a director, and (ii) to all other eligible directors
upon his or her initial election as a director and on each subsequent date that
he or she is re-elected as a director.

               (b) SHARES SUBJECT TO OPTION. Except as provided below, each
option granted under the Plan shall be exercisable for 20,000 shares of Common
Stock. Notwithstanding anything to the contrary contained herein, the



                                      -1-
<PAGE>   2

number of shares for which an option is granted under the Plan shall be reduced
below 20,000 shares of Common Stock (and the exercise period adjusted) in the
event of the following:

                      (1) If, after April 24, 1991, a director is initially
               elected other than at an annual meeting of stockholders and such
               director is re-elected at the next annual meeting of
               stockholders, then:

                              (i) the option granted to such director under the
                      Plan in connection with his re-election (the "Second
                      Option") shall be exercisable for such number of shares as
                      is determined by multiplying 18.268493 (which is 6,668
                      divided by 365) by the number of days between (a) the date
                      which is the third anniversary of the date of grant of the
                      option received by such director under the Plan on the
                      date of his initial election as a director and (b) the
                      date which is the third anniversary of the date of grant
                      of the Second Option; and

                              (ii) all of such shares shall become exercisable
                      on the third anniversary of the date of grant of the
                      Second Option.

                      (2) If a director elected at an annual meeting of
               stockholders is re-elected at a subsequent annual meeting of
               stockholders which is earlier than the third annual meeting of
               stockholders following his prior election, then:

                              (i) the option granted to such director under the
                      Plan in connection with his re-election (the "Subsequent
                      Option") shall be exercisable for either (a) 6,668 shares,
                      if the annual meeting at which such director is re-elected
                      is the first annual meeting following his prior election
                      or (b) 13,334 shares, if the annual meeting at which such
                      director is re-elected is the second annual meeting
                      following his prior election;

                              (ii) if the number of shares under the Subsequent
                      Option is 13,334, then 6,666 shares shall become
                      exercisable on the second anniversary of the date of grant
                      of the Subsequent Option and 6,668 shares shall become
                      exercisable on the third anniversary of the date of grant
                      of the Subsequent Option; and

                              (iii) if the number of shares under the Subsequent
                      Option is 6,668, then all of such shares shall become
                      exercisable on the third anniversary of the date of grant
                      of the Subsequent Option.

               (c) OPTION EXERCISE PRICE. The option exercise price per share
for each option granted under the Plan shall equal (i) the last reported sales
price per share of the Company's Common Stock on the NASDAQ National Market
System (or, if the Company is traded on a nationally recognized securities
exchange on the date of grant, the reported closing sales price per share of the
Company's Common Stock by such exchange) on the date of grant (or if no such
price is reported on such date such price as reported on the nearest preceding
day) or (ii) if the Common Stock is not traded on NASDAQ or any exchange, the
fair market value per share on the date of grant as determined by the Board of
Directors.

               (d) LIMITED TRANSFERABILITY. Each option granted under the Plan
shall not be transferable by the optionee otherwise than (i) by will, or by the
laws of descent and distribution, or (ii) with the approval of the Board of
Directors, by gift to (A) one or more members of the optionee's family or
entities controlled by, or for the benefit of the optionee or such family
members, or (B) to one or more charitable organizations (including charitable
trusts). Except as the Board of Directors may otherwise determine, no option or
interest therein may be transferred, assigned, pledged or hypothecated by the
optionee during his lifetime, whether by operation of the law or otherwise, or
be made subject to execution, attachment or similar process.

               (e) EXERCISE PERIOD. Each option may be exercised on a cumulative
basis as to one-third of the shares subject to the option on each of the first,
second and third anniversaries of the date of grant of such option, provided
that, subject to the provisions of Section 5(f), no option may be exercised more



                                      -2-
<PAGE>   3
than 90 days after the optionee ceases to serve as a director of the Company. No
option shall be exercisable after the expiration of ten years from the date of
grant.

               (f) EXERCISE PERIOD UPON DISABILITY OR DEATH. Notwithstanding the
provisions of Section 5(e), any option granted under the Plan may be exercised,
to the extent then exercisable, by an optionee who becomes disabled (within the
meaning of Section 22(e)(3) of the Code or any successor provision thereto)
while acting as a director of the Company, or may be exercised, to the extent
then exercisable, upon the death of such optionee while a director of the
Company by the person to whom it is transferred by will, by the laws of descent
and distribution, or by written notice filed pursuant to Section 5(h), in each
case within the period of one year after the date the optionee ceases to be such
a director by reason of such disability or death; provided that, no option shall
be exercisable after the expiration of ten years from the date of grant.

               (g) EXERCISE PROCEDURE. Options may be exercised only by written
notice to the Company at its principal office accompanied by payment in cash of
the full consideration for the shares as to which they are exercised.

               (h) EXERCISE BY REPRESENTATIVE FOLLOWING DEATH OF DIRECTOR. A
director, by written notice to the Company, may designate one or more persons
(and from time to time change such designation) including his legal
representative, who, by reason of the director's death, shall acquire the right
to exercise all or a portion of the option. If the person or persons so
designated wish to exercise any portion of the option, they must do so within
the term of the option as provided herein. Any exercise by a representative
shall be subject to the provisions of the Plan.

        6.     ASSIGNMENTS

               The rights and benefits under the Plan may not be assigned except
for the designation of a beneficiary as provided in Section 5.

        7.     TIME FOR GRANTING OPTIONS

               All options for shares subject to the Plan shall be granted, if
at all, not later than five years after the approval of the Plan by the
Company's stockholders.

        8.     LIMITATION OF RIGHTS

               (a) NO RIGHT TO CONTINUE AS A DIRECTOR. Neither the Plan, nor the
granting of an option nor any other action taken pursuant to the Plan, shall
constitute or be evidence of any agreement or understanding, express or implied,
that the Company will retain a director for any period of time.

               (b) NO STOCKHOLDERS' RIGHTS FOR OPTIONS. An optionee shall have
no rights as a stockholder with respect to the shares covered by his options
until the date of the issuance to him of a stock certificate therefor, and no
adjustment will be made for dividends or other rights (except as provided in
Section 9) for which the record date is prior to the date such certificate is
issued.

        9.     CHANGES IN COMMON STOCK

               (a) If the outstanding shares of Common Stock are increased,
decreased or exchanged for a different number or kind of shares or other
securities, or if additional shares or new or different shares or other
securities are distributed with respect to such shares of Common Stock or other
securities, through merger, consolidation, sale of all or substantially all of
the assets of the Company, reorganization, recapitalization, reclassification,
stock dividend, stock split, reverse stock split or other distribution with
respect to such shares of Common Stock, or other securities, an appropriate and
proportionate adjustment will be made in (i) the maximum number and kind of
shares reserved for issuance under the Plan, (ii) the number and kind of shares
or other securities subject to then outstanding options under the Plan and (iii)
the price for each share subject to any then outstanding options under the Plan,
without changing the aggregate purchase price as to which such options remain
exercisable. No fractional shares will be issued under the Plan on account of
any such adjustments.



                                      -3-
<PAGE>   4

               (b) In the event that the Company is merged or consolidated into
or with another corporation (in which consolidation or merger the stockholders
of the Company receive distribution of cash or securities of another issuer as a
result thereof), or in the event that all or substantially all of the assets of
the Company are acquired by any other person or entity, or in the event of a
reorganization or liquidation of the Company, the Board of Directors of the
Company or the board of directors of any corporation assuming the obligations of
the Company, shall, as to outstanding options, either (i) provide that such
options shall be assumed, or equivalent options shall be substituted, by the
acquiring or successor corporation (or an affiliate thereof), or (ii) upon
written notice to the optionees, provide that all unexercised options will
terminate immediately prior to the consummation of such merger, consolidation,
acquisition, reorganization or liquidations unless exercised by the optionee
within a specified number of days following the date of such notice.

        10.    AMENDMENT OF THE PLAN

               The Board of Directors may suspend or discontinue the Plan or
review or amend it in any respect whatsoever; provided, however, that without
approval of the stockholders of the Company no revision or amendment shall
change the number of shares subject to the Plan (except as provided in Section
9), change the designation of the class of directors eligible to receive
options, or materially increase the benefits accruing to participants under the
Plan. The Plan may not be amended more than once in any six-month period.

        11.    NOTICE

               Any written notice to the Company required by any of the
provisions of the Plan shall be addressed to the Treasurer of the Company and
shall become effective when it is received.

        12.    GOVERNING LAW

               The Plan and all determinations made and actions taken pursuant
hereto shall be governed by the laws of the State of Delaware.

         Approved by the Board of Directors on April 24, 1991

         Approved by the Stockholders on June 10, 1991

         Amended by the Board of Directors on December 15, 1992

         Amended by the Board of Directors on February 26, 1993, with amendment
         to become effective on June 16, 1993 after approval by Stockholders

         Amendment approved by Stockholders on May 18, 1993, with amendment
         effective on June 16, 1993

         Number of shares covered by the Plan reflects 2 for 1 stock split in
         the form of a stock dividend paid on October 1, 1993

         Amended by the Board of Directors on February 9, 1995

         Amendment approved by Stockholders on May 26, 1995

         Number of shares covered by the Plan reflects 2 for 1 stock split in
         the form of a stock dividend paid on June 5, 1995

         Amended by the Board of Directors on March 5, 1996; amendment approved
         by the Stockholders on May 24, 1996.

         Amended by the Board of Directors on July 21, 1999.


                                      -4-

<PAGE>   1
                                        CONFIDENTIAL MATERIAL OMITTED AND
                                        FILED SEPARATELY WITH THE SECURITIES AND
                                        EXCHANGE COMMISSION (*Denotes Omission)
                                              EXHIBIT 10.6d (REDACTED)

                 Fifth Amendment to the IDEXX Laboratories, Inc.
                      and Ortho-Clinical Diagnostics, Inc.
               (as successor in interest to Eastman Kodak Company)
                     Supply Agreement dated January 15, 1992


This Amendment (the "AMENDMENT") is effective as of January 1, 1999, by and
between Ortho-Clinical Diagnostics, Inc. (formerly known as Johnson & Johnson
Clinical Diagnostics, Inc.), a New York corporation with offices at 100 Indigo
Creek Drive, Rochester, N.Y. ("OCD"), and IDEXX Laboratories, Inc., a Delaware
corporation, with offices at One IDEXX Drive, Westbrook, Maine, 04092 ("IDEXX").

WHEREAS OCD and IDEXX desire to amend the Supply Agreement dated January 15,
1992, as amended on November 16, 1993, November 19, 1993, March 15, 1994 and
January 1, 1996 (such Supply Agreement as so amended being hereinafter referred
to as the "SUPPLY AGREEMENT") as provided herein:

NOW, THEREFORE, in consideration of the premises and the mutual agreements
contained herein, the parties hereto agree as follows:

1. All references to Johnson & Johnson Clinical Diagnostics Systems, Inc. or
JJCD shall be deemed to be replaced by reference to Ortho-Clinical Diagnostics,
Inc. or OCD.

2. In Clause 1, the following definitions are hereby deleted in their entirety
and replaced with the following:

   "the Term"               The period from January 1, 1999 until December 31,
                            2010.


   "the VETTEST analyzer"   The VETTEST VT 8008 analyzer developed by or on
                            behalf of VETTEST S.A., predecessor of IDEXX, for
                            veterinary purposes and using VITROS slides;
                            including (i) any updates or modifications to such
                            analyzer, or (ii) other chemistry testing
                            instrument which, in the case of clause(i) and
                            (ii), is designed by IDEXX to be the bridging
                            instrument to a next-generation veterinary
                            chemistry analyzer ***********
                            ***********************************

   "the VETTEST slides"     VITROS or other OCD chemistry slides specially bar
                            coded, labeled, and/or packaged for the VETTEST
                            analyzer in



<PAGE>   2

                             accordance with the terms of this Agreement and
                             supplied by OCD in accordance with the terms and
                             conditions of this Agreement.

3.      In Clause 1, insert the following terms:

   "the Effective Rebate Rate"  For any year, the weighted average percentage
                                reduction in the purchase price of any slides
                                purchased in such year that IDEXX is entitled to
                                receive pursuant to Section 7.03 hereunder.  The
                                calculation of the Effective Rebate Rate is
                                illustrated in Schedule 10.

   "the Prime Rate"             For any day in any calendar month, the prime
                                rate of interest as published in the WALL STREET
                                JOURNAL on the last business day of the
                                immediately preceding month.

   *********************        *****************************
                                *********************************
                                ********

4.      Sub-Clause 5.01 is hereby deleted in its entirety and is replaced by the
        following:

        5.01    Attached hereto as SCHEDULE 7 are Purchase Commitments by IDEXX
                for VETTEST slides for calendar years 1999 through and including
                2006. The Purchase Commitments constitute IDEXX's anticipated
                minimum aggregate purchase quantities for single chemistry
                VETTEST slides and PANELS/PROFILES slides in the indicated
                calendar years. For calendar years 2007 through and including
                2010, IDEXX shall advise OCD of the Purchase Commitment for each
                such year not later than October 1 of the preceding year, and
                upon receipt by OCD, such Purchase Commitments shall be deemed
                to be incorporated into SCHEDULE 7. IDEXX's aggregate Purchase
                Commitment for the period 2007 through and including 2010 shall
                be not less than ********** slides.

                During each of calendar years 2000 through and including 2002,
                IDEXX shall purchase not less than ***************** single
                slides; during each of calendar years 2003 through and including
                2006, IDEXX shall purchase not less than *************** single
                slides; and during each of the calendar years 2007 through and
                including 2010, IDEXX shall purchase a minimum number of single
                slides egual to *** of the total Purchase Commitment for such
                year.

                Failure by IDEXX to purchase at least the indicated Purchase
                Commitment quantities of each type of slides in any year may
                subject IDEXX to the


                                       2
<PAGE>   3

                requirement to make a payment to OCD as set forth in sub-Clause
                5.02 below, but such failure shall in no event otherwise be
                deemed to be a breach of this Agreement.

5.      Sub-Clause 5.04 is hereby deleted in its entirety and is replaced by the
        following:

        5.04    Not later than October 1 of each calendar year commencing
                October 1, 1999, IDEXX shall notify OCD of forecasted
                requirements for the subsequent year for each of the VETTEST
                slides (single slides and PANELS/PROFILES slides) (each such
                notification, a "PURCHASE FORECAST"), and the order quantities
                in the subsequent year for each of the VETTEST slides shall be
                within+/-25% of the such Purchase Forecast unless the parties
                otherwise agree. As long as slide orders are within the
                indicated range of+/-25% of the applicable Purchase Forecast,
                OCD shall deliver the slides in accordance with the orders. The
                Purchase Forecasts constitute non-binding forecasts which shall
                be the basis for determining IDEXX's quarterly cash rebate
                pursuant to sub-Clause 7.03 below.

6.      Sub-Clause 7.03 is hereby deleted in its entirety and is replaced by the
        following:

        7.03    Beginning with slide purchases made during calendar year 2000
                (which, for the avoidance of doubt, shall not include any slides
                shipped by OCD in calendar year 2000 to fulfill IDEXX's total
                1999 purchase order for ********* slides), IDEXX shall be
                entitled to receive a cash rebate in the amounts set forth below
                for total slide purchases that, in any year, exceed the
                quantities set forth below as follows:

                 Annual Slide Purchases              Incremental Cash Rebate -
                                                        % Off Purchase Price
                     **************                              **
                 **********************                         ***
                 **********************                         ***
                 **********************                         ***
                 **********************                         ***
                 **********************                         ***
                 **********************                         ***


                The rebate amounts set forth above constitute a percentage
                reduction in the purchase price of any slides (including both
                single slides and PANELS/PROFILES slides) purchased above the
                corresponding quantity. The percentage amounts are incremental
                (as opposed to cumulative) and relate only to the quantities set
                forth opposite it. For example, if IDEXX were to purchase **
                **** in any one calendar year, it would not be entitled to
                a *** price reduction on all slides that it purchased in such
                year, rather, it would be entitled to receive (i) ** purchase
                price reduction on the first ********* slides purchased,




                                        3
<PAGE>   4
                (ii) a *** purchase price reduction on all slides purchased over
                ********** up to and including ********* (iii) an *** purchase
                price reduction on all slides purchased over ************* up to
                and including ********** and (iv) a return *** purchase price
                reduction on all slides purchased over **************** up to
                and including the ********** slides that it purchased. The
                foregoing notwithstanding, it is understood and agreed that if
                IDEXX does not achieve the Purchase Commitments set forth above
                in any calendar year, then IDEXX shall not be entitled to
                receive a rebate for such year.

                In the beginning of each calendar year, beginning with calendar
                year 2000, OCD shall calculate an estimated Effective Rebate
                Rate (the "ESTIMATED REBATE RATE") based on the lesser of (i)
                IDEXX's Purchase Forecast for such year and (ii) **** of the
                total number of slides that IDEXX purchased in the immediately
                preceding calendar year. Not later than thirty (30) days after
                the end of each of the first three calendar quarters in any
                calendar year (or thirty days after IDEXX completes payment in
                full for slides purchased during such quarter, if later), OCD
                shall pay to IDEXX an amount equal to the estimated rebate
                payment that IDEXX would be entitled to receive in such quarter
                (the "ESTIMATED REBATE PAYMENT"). The Estimated Rebate Payment
                for any quarter shall be calculated by (i) multiplying the
                Estimated Rebate Rate in effect during such quarter by the total
                purchase price for the VETTEST slides purchased by IDEXX during
                such quarter and (ii) subtracting from such amount an amount
                equal to *** of the total calculated in clause (i) above. The
                foregoing notwithstanding, if, in any calendar year, (i) IDEXX's
                total slide orders for the immediately preceding calendar year
                were less than *** of its Purchase Forecast for such preceding
                calendar year or (ii) OCD determines, in its reasonable
                discretion, at anytime after the end of the second calendar
                quarter of such calendar year, that IDEXX is reasonably unlikely
                to meet its Purchase Forecast for such year, then OCD shall have
                the right to recalculate the Estimated Rebate Rate based on
                IDEXX's Purchase Commitment for such year (such recalculated
                rate being hereinafter referred to as the "New Estimated Rebate
                Rate"). If OCD elects to recalculate the Estimated Rebate Rate
                pursuant to the immediately preceding sentence, (i) OCD shall
                notify IDEXX in writing which notice shall set forth the New
                Estimated Rebate Rate, (ii) OCD shall calculate all remaining
                quarterly Estimated Rebate Payments (which may include the
                Estimated Rebate Payment for the second calendar quarter) using
                the New Estimated Rebate Rate and (iii) all such Estimated
                Rebate Payments shall be made in accordance with this sub-clause
                7.03, except that such Estimated Rebate Payments shall be less
                the amount by which the Estimated Rebate Payments received by
                IDEXX during the then current calendar year exceed the Estimated
                Rebate Payments IDEXX would have received during such calendar
                year if the New Estimated Rebate Rate were in effect from the
                first day of such calendar year. Notwithstanding any provision
                in this Agreement to the contrary, OCD shall not be required to
                make any Estimated Rebate Payments to IDEXX in any calendar



                                        4
<PAGE>   5

                year if (A) any amounts payable to OCD from IDEXX pursuant to
                this Agreement are overdue, unless such amounts are being
                disputed in good faith by IDEXX, or (B) OCD determines in its
                reasonable judgment that IDEXX is reasonably unlikely to meet
                its Purchase Commitments for such year. In the case of clause
                (B) above, OCD shall have the right to make such determination
                at any time after the end of the second calendar quarter of any
                calendar year (or at the beginning of such calendar year if
                IDEXX's Purchase Forecast for such year is less than its
                Purchase Commitment for such year) provided that OCD has
                consulted with IDEXX and given IDEXX an opportunity (which
                opportunity shall be available for a period of not less than 5
                business days nor more than 10 business days) to demonstrate its
                intent and ability to meet its Purchase Commitments for such
                year. For the avoidance of doubt, OCD's obligation to make any
                Estimated Rebate Payments shall be suspended during the period
                referred to in the immediately preceding sentence and the days
                in such period shall not be counted when determining the date by
                which the next scheduled Estimated Rebate Payment is due and
                payable. If, after fulfilling the requirements set forth in this
                paragraph, OCD makes the determination described in clause (B)
                above, OCD (i) shall promptly notify IDEXX in writing of its
                determination and (ii) shall thereafter have the right to cease
                making Estimated Rebate Payments for the remainder of such
                calendar year.

                Not later than thirty (30) business days after the end of the
                last calendar quarter of any calendar year (or thirty days after
                IDEXX completes payment in full for slides purchased during such
                quarter, if later), OCD shall pay to IDEXX the amount by which
                (i) the Effective Rebate Rate multiplied by the total purchase
                price for VETTEST slides purchased by IDEXX during such calendar
                year exceeds (ii) the aggregate amount of the Estimated Rebate
                Payments made by OCD to IDEXX during such calendar year. If the
                amount in clause (ii) above exceeds the amount in clause (i)
                above, OCD shall deliver to IDEXX a written notice of such fact
                (a "Reimbursement Notice") and IDEXX shall pay to OCD, within
                thirty (30) days of receipt of such notice an amount in cash
                equal to the amount of such excess.

                Notwithstanding the foregoing, (i) if any amounts payable to OCD
                from IDEXX pursuant to this Agreement are overdue, other than
                amounts that are being disputed in good faith by IDEXX, then OCD
                shall be entitled to withhold such overdue amount (plus any
                accrued interest) from any rebate payments to which IDEXX may be
                entitled and (ii) if IDEXX does not achieve its Purchase
                Commitment in any given calendar year, then IDEXX shall return
                all Estimated Rebate Payments received from OCD for such year no
                later than thirty (30) days after the end of such calendar year.

                Any overdue payments by OCD or IDEXX of any amounts owed to the
                other pursuant to this sub-clause 7.03 shall bear interest at a
                rate per annum equal to*** **********. Such interest shall be
                payable at the same time as the payment to



                                        5
<PAGE>   6

                which it relates and shall be calculated daily on the basis of a
                year of 365 days and the actual number of days elapsed.

                OCD shall prepare a remittance advice to accompany each rebate
                payment (or Reimbursement Notice), which shall set forth the
                reporting period for which the payment is made (or demanded) and
                a summary sheet which shall detail OCD's calculation of the
                rebate (or reimbursement). If IDEXX disagrees with the rebate or
                reimbursement calculation, IDEXX shall promptly notify OCD, and
                the parties shall review the calculations together in good faith
                to agree on any appropriate corrections or adjustments.

                An illustrative representation of the foregoing rebate
                calculation methodology is attached hereto as SCHEDULE 10.

7.      SCHEDULE 7 to the Agreement is hereby deleted in its entirety and
        replaced by SCHEDULE 7 attached hereto.

8.      Clause 31 is hereby added to the Agreement as follows:

        31.     1999 REBATE

                If during calendar year 1999 IDEXX sells worldwide any of the
                total slide volumes set forth below (counting both single slides
                and PANELS/PROFILES slides), IDEXX shall be entitled to a cash
                rebate in the amount set forth opposite such sales volume:


                1999 Worldwide Slide Sales           Total Cash Rebate
                        ***********                          **
                  ***********************               ************
                  ***********************               ************
                        ***********                     ************

                The cash rebates above are not incremental or cumulative. For
                the avoidance of doubt, the maximum rebate payment that IDEXX
                could qualify for under this Clause 31 is *********. IDEXX shall
                provide OCD with estimated sales volume information for calendar
                year 1999 not later than December 15, 1999. Not later than
                January 31, 2000, IDEXX shall provide OCD with 1999 actual slide
                sales volume information and, at any time that OCD may
                reasonably request, any other supporting information or
                documentation that OCD may reasonably request. OCD shall
                calculate IDEXX's rebate accordingly, and shall remit to IDEXX
                the total rebate amount not later than (i) February 15, 2000 or,
                if later, (ii) five (5) business days after receipt by OCD, to
                its reasonable satisfaction, of all information which it
                requested pursuant to the immediately preceding sentence. Any
                overdue payments by OCD shall bear interest at a rate per annum
                equal to



                                        6
<PAGE>   7

                ***********. Such interest shall be payable at the same time as
                the payment to which it relates and shall be calculated daily on
                the basis of a year of 365 days and the actual number of days
                elapsed.

9.      Clause 32 is hereby added to the Agreement as follows:

        32.     PACKAGING LINE CAPACITY

                The parties agree that OCD shall make a capital investment to
                increase the through-put capacity of the Individual Slide
                Packaging ("ISP") line. OCD estimates the total capital and
                validation costs to increase the capacity of the ISP line to be
                ***********. If at any time OCD has reason to believe that the
                total capital and validation costs will exceed its estimate by
                more than ***, OCD shall promptly notify IDEXX and thereafter,
                OCD and IDEXX shall form a joint team, consisting of two
                representatives from each party. Such team will cooperate in
                determining the most efficient and cost effective way to
                increase the capacity of the ISP line taking into account the
                measures that have been taken, and the costs that have been
                incurred, up to that time. The parties agree to implement the
                recommendations of the joint team.

                The capital and validation costs to increase the capacity of the
                ISP line shall be borne by OCD. If, however, IDEXX does not
                achieve, during the combined calendar years 2000 and 2001, its
                aggregate Purchase Commitments for such years, then IDEXX shall
                reimburse OCD ******************** of such costs within thirty
                (30) days after receipt of reasonably detailed documentation
                supporting such costs. Any overdue payments by IDEXX shall bear
                interest at a rate per annum equal to ************. Such
                interest shall be payable at the same time as the payment to
                which it relates and shall be calculated daily on the basis of a
                year of 365 days and the actual number of days elapsed. IDEXX
                shall have the right to assume responsibility for packaging
                PANELS/PROFILES slides.

                If IDEXX elects to exercise such right, then (i) IDEXX shall
                notify OCD in writing that it proposes to assume such
                responsibility and (ii) thereafter, the parties shall cooperate
                in developing and implementing a plan to effect such a
                transition in a mutually acceptable timeframe, which timeframe
                shall in no event be less than six (6) months from the date OCD
                receives the notice described in clause (i) above.



10.     Clause 33 is hereby added to the Agreement as follows:

        33.     COST SAVING INITIATIVES

                The parties will form a joint team prior to March 31, 2000,
                consisting of two representatives from each party. Such team
                will cooperate to identify potential savings for both parties
                relating to slide manufacturing, post-cartridge packaging,


                                        7
<PAGE>   8

                purchasing, delivery schedules and quality testing processes. If
                this team identifies cost reduction opportunities, and both
                parties reasonably and mutually agree to implement such cost
                reductions, then the parties shall share equally in any cost
                savings.

                The parties shall form an additional joint team prior to March
                31, 2000, consisting of two representatives from each party.
                Such team will cooperate to identify areas of potential savings
                for IDEXX in the distribution process. If this team identifies
                distribution cost reduction opportunities, and both parties
                reasonably and mutually agree to implement such cost reductions,
                then the parties shall share in any cost savings in such
                proportion as they mutually and in good faith agree. The parties
                agree that if OCD distributes slides directly to IDEXX's
                distributors or end-user customers, OCD would invoice IDEXX for
                distribution services in the same manner that billing for slide
                products is currently administered under sub-Clause 8.01 of this
                Agreement.

11.     Clause 34 is hereby added to the Agreement as follows:

        ***     *******************


                ***************************************************************
                ***************************************************************
                ***************************************************************
                ***************************************************************
                ***************************************************************
                ****************************************


                                        8
<PAGE>   9


12.     Clause 35 is hereby added to the Agreement as follows:

        35.     INCREMENTAL SALES OPPORTUNITIES

                If IDEXX provides OCD with specific documentation regarding
                ******************************* that would require IDEXX to
                purchase a number of slides over and above its Purchase
                Commitments for any year and would **************************
                ***************************************************************,
                OCD agrees, upon receipt of any additional information
                that OCD may reasonably request regarding such
                *****************, to negotiate in good faith to reach agreement
                with IDEXX on *************************************************
                ****************** and any other related terms and conditions.
                It is understood and agreed that any slides which IDEXX
                purchases from OCD ********************************************
                *************************, shall be excluded from the
                determination of IDEXX's slide purchases for purposes of
                achieving its Purchase Committments and the determination of any
                rebate entitlement under sub-Clause 7.03 of the Agreement.


13.     Except as modified by this Fifth Amendment, all terms and conditions of
        the Supply Agreement shall continue in full force and effect.



                                       9
<PAGE>   10



IN WITNESS WHEREOF, each of the parties have caused this Agreement to be
executed by its duly authorized officer to be effective as of the date first
above written.

ORTHO-CLINICAL                               IDEXX LABORATORIES, INC.
DIAGNOSTICS, INC.


By: /s/ David A. Rowan                       By: /s/ Louis W. Pollock
   ----------------------------------           -------------------------------
   David A. Rowan,                              Louis W. Pollock,
   Vice President, Corporate Accounts           President,
                                                Professional Office Diagnostics
                                                Division


By: /s/ Cathy Burzik
   ----------------------------------
   Cathy Burzik
   President,
   Ortho-Clinical Diagnostics, Inc.



                                       10
<PAGE>   11


                        SCHEDULE 7 - PURCHASE COMMITMENTS


- ------------------------------------ ------------------------------------
               YEAR                         MINIMUM SLIDE PURCHASE
                                           COMMITMENT (IN MILLIONS)
- ------------------------------------ ------------------------------------
               1999                                  **
- ------------------------------------ ------------------------------------
               2000                                  **
- ------------------------------------ ------------------------------------
               2001                                  **
- ------------------------------------ ------------------------------------
               2002                                  **
- ------------------------------------ ------------------------------------
               2003                                  **
- ------------------------------------ ------------------------------------
               2004                                  **
- ------------------------------------ ------------------------------------
               2005                                  **
- ------------------------------------ ------------------------------------
               2006                                  **
- ------------------------------------ ------------------------------------
               2007                       See Agreement Section 5.01
- ------------------------------------
               2008
- ------------------------------------
               2009
- ------------------------------------
               2010
- -------------------------------------------------------------------------





                                       11
<PAGE>   12


                 SCHEDULE 10 - ILLUSTRATIVE REBATE CALCULATIONS

The Estimated Rebate Payments will be calculated for each of the first three
calendar quarters using the Effective Rebate Rate, as described more fully in
sub-clause 7.03 of the Agreement. Any required adjustments will be made at the
end of the fourth calendar quarter, in accordance with sub-clause 7.03 of the
Agreement.
EXAMPLE: THE PURCHASE FORECAST FOR A GIVEN YEAR IS ** MILLION SLIDES; PRICING IS
****/SLIDE; BLENDED REBATE PERCENTAGE RATE IS ****, AS FOLLOWS:


         ********************** million slides * *** = *** million slides
         ********************** million slides * *** = *** million slides
         ********************** million slides * *** = *** million slides
         ********************** million slides * *** = *** million slides
         ********************** million slides * *** = *** million slides
         ----------------------------------------------------------------
         Total Slides Eligible for Rebate = ***** million slides

EFFECTIVE REBATE = TOTAL SLIDES ELIGIBLE FOR REBATE / TOTAL PURCHASES = ******
**********

ACTUAL VOLUME PURCHASED EQUALS VOLUME PROJECTED AT THE BEGINNING OF THE YEAR.

<TABLE>
<CAPTION>
            ------------------------------------------------------------------------------------------------------------
             Actual Qtrly.               Effective Rebate            Calculated
                 Vol.         Purchases      % (80MM                 Rebate Each       20% Holdback      Rebate Paid
              (millions)        ($MM)          Vol.)               Qtr. (millions)      (millions)       (millions)
            -------------------------------------------------------------------------------------------------------------
<S>               <C>            <C>            <C>                    <C>                  <C>               <C>
1st Qtr           **             ***            ****                   ****                 ****              ****
2nd Qtr           **            *****           ****                   ****                 ****              ****
3rd Qtr           **            *****           ****                   ****                 ****              ****
4th Qtr           **            *****           ****                   ****                 ****              ****
                  --            -----                                  ----                 ----              ----
                  **            *****                                  ****                 ****              ****
                                                         True-up:      ****                                   ****
                                                                  ---------------                        ---------------
                                                           Total:      ****                                   ****
                                                                 ================                        ================
</TABLE>

ACTUAL VOLUME PURCHASED IS GREATER THAN VOLUME PROJECTED AT THE BEGINNING OF THE
YEAR.

<TABLE>
<CAPTION>
           --------------------------------------------------------------------------------------------------------------
             Actual Qtrly.                Effective Rebate         Calculated
                 Vol.         Purchases      % (80MM               Rebate Each       20% Holdback     Rebate Paid
              (millions)        ($MM)          Vol.)             Qtr. (millions)      (millions)       (millions)
            -------------------------------------------------------------------------------------------------------------
<S>                <C>          <C>             <C>                  <C>                   <C>             <C>
1st Qtr            *            ****            ****                 ****                  ****            ****
2nd Qtr           **            *****           ****                 ****                  ****            ****
3rd Qtr           **            *****           ****                 ****                  ****            ****
4th Qtr           **            *****           ****                 ****                  ****            ****
                  --            -----                                ----                  ----            ----
                  **            *****                                ****                  ****            ****
                                                       True-up:      ****                                  ****
                                                               ----------------                      ----------------
                                                       Total:        ****                                  ****
                                                               ================                      ================
</TABLE>

                                       12
<PAGE>   13




ACTUAL VOLUME PURCHASED IS LOWER THAN VOLUME PROJECTED AT THE BEGINNING OF THE
YEAR.

<TABLE>
<CAPTION>
            -------------------------------------------------------------------------------------------------
                                             Effective       Calculated
             Actual Qtrly.                    Rebate         Rebate Each         20%
                 Vol.        Purchases       % (80MM            Qtr.          Holdback       Rebate Paid
              (millions)       ($MM)           Vol.)         (millions)      (millions)      (millions)
            -------------------------------------------------------------------------------------------------
<S>               <C>           <C>             <C>              <C>             <C>             <C>
1st Qtr           **            ****            ****             ****            ****            ****
2nd Qtr           **            *****           ****             ****            ****            ****
3rd Qtr           **            *****           ****             ****            ****            ****
4th Qtr           **            *****           ****             ****            ****            ****
                  --            -----                           ------           ----            ----
                  **            *****                            ****            ****            ****
                                                   True-up:     ******                           ****
                                                                ------                           ----
                                                     Total:      ****                            ****
                                                           ================               =================
</TABLE>




                                       13








<PAGE>   1
                                                                      EXHIBIT 13

                             SELECTED FINANCIAL DATA

    The following table sets forth selected consolidated financial data of the
Company for each of the five years ended December 31, 1999. The selected
consolidated financial data presented below have been derived from the Company's
consolidated financial statements, which have been audited by Arthur Andersen
LLP, independent public accountants. These financial data should be read in
conjunction with the consolidated financial statements, related notes and other
financial information appearing elsewhere in this Form 10-K.

<TABLE>
<CAPTION>
                                                                         YEARS ENDED DECEMBER 31,
                                                 -----------------------------------------------------------------------
                                                      1995           1996           1997           1998          1999
                                                 -------------  -------------  -------------  -------------    ---------
                                                                   (IN THOUSANDS, EXCEPT PER SHARE DATA)

<S>                                                 <C>            <C>            <C>            <C>            <C>
         STATEMENT OF OPERATIONS DATA:
         Revenue..............................      $188,602       $267,677       $262,970       $319,889       $356,214
         Cost of revenue......................        80,860        115,770        141,030        161,698        182,117
                                                    --------       --------       --------       --------       --------
         Gross profit.........................       107,742        151,907        121,940        158,191        174,097
         Expenses:
            Sales and marketing...............        47,490         64,450         66,383         62,844         56,912
            General and administrative........        17,092         28,271         42,930         43,558         43,055
            Research and development..........        10,192         12,195         17,057         22,687         27,313
            Non-recurring operating charge....            --             --         21,300             --             --
            Write-off of in-process research
             and development..................            --             --         13,200         37,162             --
                                                    --------       --------       --------       --------       --------

         Income (loss) from operations........        32,968         46,991        (38,930)        (8,060)        46,817
         Interest income, net.................         4,068          8,332          6,670          6,877          5,728
                                                    --------       --------       --------       --------       --------
         Net income (loss) before provision for
           (benefit of) income taxes..........        37,036         55,323        (32,260)        (1,183)        52,545
         Provision for (benefit of) income
            taxes.............................        15,542         22,682        (11,140)        14,032         19,967
                                                    --------       --------       --------       --------       --------
         Net income (loss)....................      $ 21,494       $ 32,641       $(21,120)      $(15,215)      $ 32,578
                                                    ========       ========       ========       ========       ========
         Net income (loss) per share:
            Basic.............................      $   0.65      $    0.88      $   (0.56)     $   (0.40)     $    0.85
            Diluted...........................          0.61           0.83          (0.56)         (0.40)          0.82
         Weighted average shares outstanding:
            Basic.............................        32,946         37,082         37,974         38,513         38,412
            Diluted...........................        35,362         39,519         37,974         38,513         39,743
</TABLE>


<TABLE>
<CAPTION>
                                                                      AS OF DECEMBER 31,
                                             --------------------------------------------------------------------
                                                 1995          1996          1997           1998          1999
                                             ------------- ------------- -------------  -------------   ---------
                                                                        (IN THOUSANDS)
<S>                                            <C>           <C>           <C>            <C>           <C>
                BALANCE SHEET DATA:
                Working capital..........      $ 228,565     $ 250,590     $ 205,326      $ 188,829     $ 156,891
                Total assets.............        312,540       373,852       373,064        386,548       360,158
                Total debt...............          1,687         3,000         4,087          9,381         3,543
                Stockholders' equity.....        279,125       322,725       302,733        307,840       284,341
</TABLE>



                                       1
<PAGE>   2



MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF
OPERATIONS

*  RESULTS OF OPERATIONS

    The Company operates primarily through two business units: the Companion
Animal Group ("CAG") and Food and Environmental Division ("FED"). CAG comprises
the Company's veterinary diagnostic products and services, its animal health
pharmaceuticals business, and its veterinary informatics and internet business.
FED comprises the Company's services and products for food and environmental
testing. Through a series of transactions completed in late 1999 and the first
quarter of 2000, the Company disposed of substantially all of its businesses
related to food microbiology testing. FED now comprises the Company's water and
dairy testing business and its production animal services business.

1999 Compared to 1998

COMPANION ANIMAL GROUP

    Revenue for CAG for 1999 increased 12% to $278.0 million from $247.8 million
in 1998. The increase in revenue in 1999 compared to 1998 is primarily
attributable to increased sales of consumables used in the Company's veterinary
instruments, veterinary reference laboratory services, practice information
management hardware, software and services and feline test kits. These increases
were partially offset by decreased sales of canine test kits and sales of
veterinary instruments. International revenue for CAG increased 4% to $62.4
million, or 22% of total CAG revenue, in 1999, compared to $59.8 million, or 24%
of total CAG revenue, in 1998.

    Gross profit as a percentage of CAG revenue was 48% for 1999 compared to 49%
for 1998. Higher sales of lower margin veterinary laboratory services and
practice information management software products and services were partially
offset by increased sales of higher margin veterinary consumables.

FOOD AND ENVIRONMENTAL DIVISION

    Revenue for FED for 1999 increased 8% to $78.2 million from $72.1 million in
1998. The increase in revenue in 1999 compared to 1998 is primarily attributable
to increased sales of water testing products, dairy residue test kits, and food
laboratory testing services, partially offset by decreased sales of dehydrated
culture media. International revenue for FED increased 6% to $32.1 million, or
41% of total FED revenue, in 1999, compared to $30.2 million, or 42% of total
FED revenue, in 1998.

    Gross profit as a percentage of FED revenue was 53% for 1999 compared to 52%
for 1998. Increased sales of higher margin water, dairy residue and livestock
test kits were partially offset by a decline in the average unit prices of
poultry kits, which was in response to increased competition.

OPERATING EXPENSES

    Sales and marketing expenses were 16% and 20% of revenue in 1999 and 1998,
respectively. The decrease as a percentage of revenue and the dollar decrease of
$5.9 million were principally attributable to decreases in salary and related
expenses resulting from workforce reductions, partially offset by the inclusion
of sales and marketing expenses for Blue Ridge Pharmaceuticals, Inc. ("Blue
Ridge") acquired in the last quarter of 1998.

    Research and development expenses were 8% and 7% of revenue in 1999 and
1998, respectively. The increase as a percentage of revenue and the dollar
increase of $4.6 million are primarily attributable to the inclusion of a full
year of expense for Blue Ridge and development of the VetConnect Internet
business.

    General and administrative expenses were 12% and 14% of revenue in 1999 and
1998, respectively. The decrease as a percentage of revenue and the dollar
decrease of $503,000 are primarily attributable to decreases in management bonus
expense, provision for bad debts and currency losses. These decreases were
partially offset by increased amortization expense as a result of a full year of
expense for Blue Ridge in 1999, costs associated with the divestiture of the
food laboratory business, and officer severance expenses.


                                       2
<PAGE>   3
    Net interest income was $5.7 million in 1999 compared to $6.9 million in
1998. The decrease in net interest income over the prior year is due to interest
expense on the notes issued in the acquisition of Blue Ridge in the last quarter
of 1998, decreased cash balances resulting from the acquisition of Blue Ridge in
1998, the repurchase of shares of the Company's common stock in 1999 and lower
domestic interest rates in the first three quarters of 1999.

    The Company's effective tax rate was 38% in 1999 compared to 39% before the
write-off of in-process research and development in 1998. The decrease in the
effective tax rate was principally attributable to the renewal of federal and
state credits for research and development activities.


1998 Compared to 1997

COMPANION ANIMAL GROUP

    Revenue for CAG for 1998 increased 24% to $247.8 million from $200.4 million
in 1997. The increase in revenue in 1998 compared to 1997 is primarily
attributable to increased sales of feline and canine test kits, consumables used
in the Company's veterinary instruments, practice information management
hardware, software and services resulting from the acquisition of practice
information management software companies in the first and third quarters of
1997, and veterinary reference laboratory services. These increases were offset
in part by decreased unit sales of veterinary instruments. International revenue
for CAG increased 4% to $59.8 million, or 24% of total CAG revenue, in 1998,
compared to $57.6 million, or 29% of total CAG revenue, in 1997.

    Gross profit as a percentage of CAG revenue was 49% for 1998 compared to 46%
for 1997. Higher sales of higher margin veterinary test kits and consumables
were partially offset by increased sales of lower margin veterinary laboratory
services and practice information management software products and services.

FOOD AND ENVIRONMENTAL DIVISION

    Revenue for FED for 1998 increased 16% to $72.1 million from $62.3 million
in 1997. The increase in revenue in 1998 compared to 1997 is primarily
attributable to increased sales of food and environmental testing products,
poultry and livestock test kits, and food laboratory testing services
principally resulting from the acquisition of Agri-West Food Laboratory in March
1998. International revenue for FED increased 16% to $30.2 million, or 42% of
total FED revenue, in 1998, compared to $26.0 million, or 42% of total FED
revenue, in 1997.

    Gross profit as a percentage of FED revenue was 52% for 1998 compared to 53%
for 1997. Increased sales of higher margin water, poultry and livestock kits
were offset by unfavorable product mix in the food products.

OPERATING EXPENSES

    Sales and marketing expenses were 20% and 25% of revenue in 1998 and 1997,
respectively. The decrease as a percentage of revenue and the dollar decrease of
$3.5 million were principally attributable to an overall reduction in marketing
and sales staff and related expenses resulting from workforce reductions
worldwide, partially offset by the inclusion of a full year of expense for the
veterinary practice information management software and food laboratory service
businesses.

    Research and development expenses were 7% and 6% of revenue in 1998 and
1997, respectively. The increase as a percentage of revenue and the dollar
increase of $5.6 million reflected additional resources and related overhead to
support product development and the addition of pharmaceutical development
expenses associated with the acquisition of Blue Ridge in October 1998.

    General and administrative expenses were 14% and 16% of revenue in 1998 and
1997, respectively. In dollars, general and administrative expenses increased
$628,000 from 1997 to 1998. The increase was principally attributable to an
increase in management incentive bonuses from 1997 when no bonuses were paid;
additional expenses associated with the expansion of the veterinary laboratory
business; and additional general and administrative expenses associated with
acquired businesses, principally the acquisition of Blue Ridge in October 1998.
These increases were offset in part by a decrease in the provision for bad
debts and by a decrease in currency losses.


                                       3
<PAGE>   4

    On October 1, 1998, the Company acquired Blue Ridge Pharmaceuticals, Inc., a
development-stage animal health pharmaceutical company with 11 products in
development. At the acquisition date Blue Ridge had no commercially viable
products and no historical revenue stream. The Company allocated the aggregate
purchase price of $59.2 million plus $300,000 of acquisition costs based on the
fair market value of tangible and intangible assets acquired, in accordance with
Accounting Principles Board Opinion No. 16 ("APB 16"). The acquisition was
accounted for as a purchase in accordance with APB 16 and the results of
operations have been included with the Company's results since the date of
acquisition. To value the intangible assets acquired the Company obtained an
independent appraisal. That appraisal was performed using proven valuation
techniques and supplemental guidance provided by the Securities and Exchange
Commission. The aggregate purchase price was allocated as follows (in
thousands):

   Current assets, including cash of $1,882                $1,243
   Long-term assets                                           118
   Deferred tax assets                                      3,444
   Current liabilities                                     (3,400)
   Intangibles                                                200
   In-process research and development                     37,162
   Goodwill                                                20,094
                                                         --------
                                                         $ 59,500
                                                         ========

    Intangibles include $37.2 million for purchased in-process research and
development for projects that do not have future alternative uses. This
allocation represents the estimated fair value based on risk-adjusted cash
flows, adjusted using percentage of completion methodology (see below), related
to the in-process research and development projects. The development of these
projects had not yet reached technological feasibility and the in-process
research and development had no alternative uses. Accordingly, these costs were
expensed as of the acquisition date in accordance with FASB Interpretation No.
4, Applicability of FASB Statement No. 2 to Business Combinations Accounted for
by the Purchase Method.

    Eight of the eleven projects were pharmaceuticals for companion animals,
including horses, and three of the eleven projects were pharmaceuticals for food
animals. These projects use a combination of proprietary compounds and novel
delivery systems. To be sold commercially the products must be approved by the
Center for Veterinary Medicine ("CVM"), which is the agency within the Food and
Drug Administration ("FDA") that is responsible for managing approval of new
animal drugs. There are five types of data that must be provided to the FDA and
the CVM prior to approval. These include 1) efficacy, 2) safety to the animals
to be treated, 3) safety to the humans who will consume the animal or its
products (if applicable), 4) safety to the environment and 5) good manufacturing
practices (quality control of production to assure a consistent product). The
Company utilizes clinical studies to support its applications for approval. The
companion animal projects ranged from 19% to 78% complete, while the food animal
projects ranged from 78% to 93% complete.

    These projects are unique and complex and frequently require modification to
the product and the manufacturing process before satisfactory clinical results
can be obtained. The delay in obtaining satisfactory data can result from any of
the five items discussed above and frequently satisfactory results cannot be
obtained.

    The in process research and development charge attributable to the companion
animal projects totaled approximately $33.1 million, and these projects were
estimated to require expenditures of $500,000 in 1999, $700,000 in 2000, and
$100,000 in 2001. The intangible asset attributable to the food animal projects
totaled approximately $4.1 million, and these projects were estimated to require
expenditures of $250,000 in 1999 and $50,000 in 2000. Management believes that
it is positioned to complete each of the major research and development
programs. These estimates are subject to change, given the uncertainties of the
development process and no assurance can be given that deviations from these
estimates will not occur. Additionally, these projects will require maintenance
expenditures when and if they have reached a state of technological and
commercial feasibility and there is no assurance that each project will meet
either technological or commercial success.

    The value assigned to purchased in-process research and development was
determined by estimating the costs to develop the purchased in-process research
and development into commercially viable products, estimating the percentage of
completion at the acquisition date, estimating the resulting net risk-adjusted
cash flows from the projects considering the percentage of completion and
discounting the net cash flows to their present value. The percentage of
completion for each project was estimated using costs incurred to date compared
to estimated costs at completion. The revenue projections used to value the
in-process research and development are based on estimates of relevant market
sizes and growth factors and nature and expected timing of new products. The



                                       4
<PAGE>   5

rate utilized to discount the net cash flows to their present value is based on
the weighted average cost of capital adjusted to consider the risk associated
with these technologies. The Company used a 20% discount factor to value this
in-process research and development.

    The forecasts used by the Company in valuing in-process research and
development were based upon assumptions the Company believed to be reasonable
but which are inherently uncertain and unpredictable. The Company's assumptions
may be incomplete or inaccurate and unanticipated events and circumstances are
likely to occur. For these reasons, actual results may vary significantly from
the projected results.

    Net interest income was $6.9 million in 1998 compared to $6.7 million in
1997. The increase in interest income is due to higher cash and investment
balances during 1998 compared to 1997, partially offset by interest expense on
the notes issued in the acquisition of Blue Ridge in the last quarter of 1998.

    The Company's effective tax rate was 39% before the write-off of in-process
research and development in 1998 compared to 40% before the write-off of
in-process research and development in 1997. The decrease in the effective tax
rate was primarily attributable to income generated in states with lower state
income tax rates and the utilization of previously unavailable federal research
and development credits.

*  LIQUIDITY AND CAPITAL RESOURCES

    At December 31, 1999, the Company had $105.4 million of cash, cash
equivalents, and short-term investments and $156.9 million of working capital.
During 1999, the Company repurchased 3.9 million shares of the Company's common
stock for $64.2 million. See Note 18.

    The Company's total capital budget for 2000 is approximately $22.8 million.
Under the terms of certain supply agreements with suppliers of the Company's
hematology instruments and consumables, slides for its VetTest instruments and
certain raw materials, the Company has aggregate commitments to purchase
approximately $35.6 million of products in 2000.

    The Company believes that current cash and short-term investments, which
include net proceeds from the offering of the Company's common stock in 1995,
and funds generated from operations, will be sufficient to fund the Company's
operations for the foreseeable future.

*  FUTURE OPERATING RESULTS

    The future operating results of the Company are subject to a number of
factors, including without limitation the following:

    The Company's business has grown significantly over the past several years
as a result of both internal growth and acquisitions of products and businesses.
The Company has consummated a number of acquisitions since 1992, including five
acquisitions in 1997, two acquisitions in 1998 and two acquisitions in 1999, and
plans to make additional acquisitions. Identifying and pursuing acquisition
opportunities, integrating acquired products and businesses, and managing growth
require a significant amount of management time and skill. There can be no
assurance that the Company will be effective in identifying and effecting
attractive acquisitions, assimilating acquisitions or managing future growth.

    The Company's future success will depend in part on its ability to continue
to develop new products and services both for its existing markets and for any
new markets the Company may enter in the future. In recent years sales of the
Company's chemistry and hematology analyzers have declined as the Company has
achieved increasing market penetration. Future growth in sales of the Company's
analyzers and associated consumables will depend in part on the Company's
ability to introduce new systems with new features and capabilities. The Company
is currently devoting significant resources to the development of such systems.
The Company also plans to devote significant resources to the growth of many of
its other businesses, including its animal health pharmaceuticals business and
VetConnect, an Internet portal/application services provider for the provision
of animal health-care information and services to veterinarians. There can be no
assurance that the Company will successfully complete the development and
commercialization of products and services for existing and new businesses or
that such products and services, if commercialized, will meet revenue and profit
expectations.


                                       5
<PAGE>   6


    The markets in which the Company competes are subject to rapid and
substantial technological change. The Company encounters, and expects to
continue to encounter, intense competition in the sale of its current and future
products and services. In particular, the Company has encountered increasing
competition in the market for canine heartworm diagnostics. Many of the
Company's competitors and potential competitors, including large pharmaceutical
companies, have substantially greater capital, manufacturing, marketing, and
research and development resources than the Company.

    The Company has experienced and may experience in the future significant
fluctuations in its quarterly operating results. Factors such as the
introduction and market acceptance of new products and services, the mix of
products and services sold and the mix of domestic versus international revenue
could contribute to this quarterly variability. The Company operates with
relatively little backlog and has few long-term customer contracts and
substantially all of its product and service revenue in each quarter results
from orders received in that quarter, which makes the Company's financial
performance more susceptible to an unexpected downturn in business and more
unpredictable. In addition, the Company's expense levels are based in part on
expectations of future revenue levels, and a shortfall in expected revenue could
therefore result in a disproportionate decrease in the Company's net income.

    The Company's success is heavily dependent upon its proprietary
technologies. The Company relies on a combination of patent, trade secret,
trademark and copyright law to protect its proprietary rights. There can be no
assurance that patent applications filed by the Company will result in patents
being issued, that any patents owned or licensed by the Company will afford
protection against competitors with similar technologies, or that the Company's
non-disclosure agreements will provide meaningful protection for the Company's
trade secrets and other proprietary information. Moreover, in the absence of
patent protection, the Company's business may be adversely affected by
competitors who independently develop substantially equivalent technologies. In
addition, the Company may be required to obtain licenses to additional
technologies from third parties in order to continue to sell certain products.
There can be no assurance that any technology licenses which the Company desires
or is required to obtain will be available on commercially reasonable terms.

    From time to time the Company receives notices alleging that the Company's
products infringe third-party proprietary rights. In particular, the Company has
received notices claiming that certain of the Company's immunoassay products
infringe third-party patents. Patent litigation frequently is complex and
expensive and the outcome of patent litigation can be difficult to predict.
There can be no assurance that the Company will prevail in any infringement
proceedings that may be commenced against the Company, and an adverse outcome
may preclude the Company from selling certain products or require the Company to
pay damages or make additional royalty or other payments with respect to such
sales. In addition, from time to time other types of lawsuits are brought
against the Company, wherein an adverse outcome could adversely affect the
Company's results of operations.

    The development, manufacturing, distribution and marketing of certain of the
Company's products and provision of its services, both in the United States and
abroad, are subject to regulation by various domestic and foreign governmental
agencies, including the U.S. Department of Agriculture and U.S. Food and Drug
Administration ("FDA") and U.S. Environmental Protection Agency.
Commercialization of animal health pharmaceuticals requires submission of
substantial clinical, manufacturing and other data to the FDA and regulatory
approval can take several years. Delays in obtaining, or the failure to obtain,
any necessary regulatory approvals could have a material adverse effect on the
Company's future product and service sales and operations. Any acquisitions of
new products, services and technologies may subject the Company to additional
areas of government regulations.

    Certain components used in the Company's products are currently available
from only one source and others are available from only a limited number of
sources. The Company's inability to develop alternative sources if and as
required in the future, or to obtain sufficient sole or limited source
components as required, could result in cost increases or reductions or delays
in product shipments. Certain technologies licensed by the Company and
incorporated into its products are also available only from a single source, and
the Company's business may be adversely affected by the expiration or
termination of any such licenses or any challenges to the technology rights
underlying such licenses. In addition, the Company currently purchases or is
contractually required to purchase certain of the products that it sells,
including its chemistry and hematology analyzers and associated consumables,
from single sources. Failure of such sources to supply product to the Company
would have a material adverse effect on the Company's business.

    In 1999, international revenue was $94.5 million and accounted for 27% of
total revenue, and the Company expects that its international business will
continue to account for a significant portion of its total revenue. Foreign
regulatory bodies often establish product standards different from those in the
United States, and designing products in compliance with such foreign standards
may be difficult or expensive. Other risks associated with foreign operations
include possible disruptions in transportation of the Company's products, the
differing product and service needs of foreign customers, difficulties in
building and managing foreign operations, fluctuations in the value of foreign
currencies, import/export duties and quotas, and unexpected regulatory, economic
or political changes in foreign markets.



                                       6
<PAGE>   7



    The development, manufacture, distribution and marketing of the Company's
products and provision of its services involve an inherent risk of product
liability claims and associated adverse publicity. Although the Company
currently maintains liability insurance, there can be no assurance that the
coverage limits of the Company's insurance policies will be adequate. Such
insurance is expensive, difficult to obtain and may not be available in the
future on acceptable terms or at all.

*  YEAR 2000

    The Year 2000 problem refers to computing failures resulting from the use by
computer programs of two digits, rather than four digits, to define a year. This
could lead, for example, to a computer recognizing a date using "00" as 1900
rather than 2000. Prior to January 1, 2000, the Company carried out a program to
identify and resolve potential Year 2000 problems. The Company's program was
focused on its information technology (IT) and non-IT internal systems, the
products and services sold by the Company, and the products and services sold by
outside vendors. The total cost to the Company to identify and address potential
Year 2000 problems was not material to the Company's financial position, results
of operations or cash flows. To date the Company has not experienced any
significant issues relating to the Year 2000. Although it is not possible to
predict whether Year 2000 problems may arise in the future, particularly with
respect to distributors, suppliers and other third parties outside of the
Company's control, the Company does not believe that Year 2000 issues will have
a material adverse impact on the Company's operations or financial results. The
Company will continue to monitor its internal systems and its software-related
products for Year 2000 issues.

    QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

    The Company's market risk consists primarily of foreign currency exchange
risk. The Company operates subsidiaries in 13 foreign countries and transacts
business in local currencies. The Company hedges its cash flows on intercompany
sales to minimize foreign currency exposure.

    The primary purpose of the Company's foreign currency hedging activities is
to protect against the volatility associated with foreign currency transactions.
Corporate policy prescribes the range of allowable hedging activity. The Company
primarily utilizes forward exchange contracts and options with a duration of
less than 12 months. Gains and losses related to qualifying hedges of foreign
currency from commitments or anticipated transactions are deferred in prepaid
expenses and are included in the basis of the underlying transaction.

    Based on the Company's overall currency rate exposure at December 31, 1999,
including derivative and other foreign currency sensitive instruments, a 5%
change in exchanges rate balances denominated in foreign currencies which is not
the functional currency would not have a material impact on the results of
operation. However, the effects of a 5% change in exchange rates, if not offset
by hedge contracts or related price adjustments would have a material impact on
the results of operations.




                                       7
<PAGE>   8




                   FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

INDEX TO CONSOLIDATED FINANCIAL STATEMENTS
AND CONSOLIDATED FINANCIAL STATEMENT SCHEDULE

                                                                            PAGE

*   Report of Independent Public Accountants...............................   9
*   Consolidated Balance Sheets as of December 31, 1998 and 1999...........  10
*   Consolidated Statements of Operations for the Years Ended December 31,
      1997, 1998 and 1999..................................................  11
*   Consolidated Statements of Stockholders' Equity for the Years Ended
      December 31, 1997, 1998 and 1999.....................................  12
*   Consolidated Statements of Cash Flows for the Years Ended December 31,
      1997, 1998 and 1999..................................................  13
*   Notes to Consolidated Financial Statements.............................  14
*   Schedule II
      Valuation and Qualifying Accounts....................................  34




                                       8
<PAGE>   9





                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS

To IDEXX Laboratories, Inc.:

    We have audited the accompanying consolidated balance sheets of IDEXX
Laboratories, Inc. (a Delaware corporation) and subsidiaries as of December 31,
1998 and 1999, and the related consolidated statements of operations,
stockholders' equity and cash flows for each of the three years in the period
ended December 31, 1999. These consolidated financial statements and the
schedule referred to below are the responsibility of the Company's management.
Our responsibility is to express an opinion on these consolidated financial
statements based on our audits.

    We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

    In our opinion, the consolidated financial statements referred to above
present fairly, in all material respects, the financial position of IDEXX
Laboratories, Inc. and subsidiaries as of December 31, 1998 and 1999, and the
results of their operations and their cash flows for each of the three years in
the period ended December 31, 1999, in conformity with generally accepted
accounting principles.

    Our audits were made for the purpose of forming an opinion on the basic
consolidated financial statements taken as a whole. The schedule listed in the
index to consolidated financial statements is presented for purposes of
complying with the Securities and Exchange Commission's rules and is not part of
the basic consolidated financial statements. The schedule has been subjected to
the auditing procedures applied in the audits of the basic consolidated
financial statements and, in our opinion, fairly states, in all material
respects, the financial data required to be set forth therein in relation to the
basic consolidated financial statements taken as a whole.


                                                             ARTHUR ANDERSEN LLP

Boston, Massachusetts
January 28, 2000 (except with respect
to the matters discussed in Notes 5 and
16, as to which the date is February 28, 2000)



                                       9
<PAGE>   10




                    IDEXX LABORATORIES, INC. AND SUBSIDIARIES

                           CONSOLIDATED BALANCE SHEETS
                      (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                                     DECEMBER 31,
                                                               ------------------------
                                                                   1998         1999
                                                               ------------  ----------
                            ASSETS
<S>                                                              <C>           <C>
  Current Assets:
     Cash and cash equivalents..............................     $109,063      $ 58,576
     Short-term investments.................................       29,290        46,835
     Accounts receivable, less reserves of $5,368 and
     $4,828 in 1998 and 1999, respectively..................       47,947        58,353
     Inventories............................................       55,428        47,488
     Deferred income taxes..................................       13,965        14,679
     Other current assets...................................        7,653         6,484
                                                                 --------      --------
       Total current assets.................................      263,346       232,415
                                                                 --------      --------
  Long-Term Investments.....................................       17,297        25,517
                                                                 --------      --------
  Property and Equipment, at cost:
     Land...................................................        1,197         1,196
     Buildings..............................................        4,487         4,528
     Leasehold improvements.................................       17,629        18,522
     Machinery and equipment................................       31,917        34,630
     Construction in progress...............................        1,840         1,152
     Office furniture and equipment.........................       25,423        28,630
                                                                 --------      --------
                                                                   82,493        88,658
     Less -- Accumulated depreciation and amortization......       41,013        49,108
                                                                 --------      --------
                                                                   41,480        39,550
                                                                 --------      --------
  Other Assets, net.........................................       64,425        62,676
                                                                 --------      --------
                                                                 $386,548      $360,158
                                                                 ========      ========
           LIABILITIES AND STOCKHOLDERS' EQUITY
  Current Liabilities:
     Accounts payable.......................................     $ 26,816      $ 19,647
     Accrued expenses.......................................       32,046        40,183
     Current portion of long-term debt......................        5,190         3,250
     Deferred revenue.......................................       10,465        12,444
                                                                 --------      --------
       Total current liabilities............................       74,517        75,524
                                                                 --------      --------
  Long-term debt, net of current portion....................        4,191           293
                                                                 --------      --------
  Commitments and Contingencies (Note 5)
  Stockholders' Equity:
     Preferred stock, $1.00 par value --  Authorized --
       500 shares None issued and outstanding................          --            --
     Series A junior participating preferred stock,
      $1.00 par value Designated -- 100 shares of preferred
      stock None issued and outstanding......................          --            --
     Common stock, $0.10 par value --  Authorized --
      60,000 shares
     Issued 38,831 shares in 1998 and 39,584
      shares in 1999........................................        3,883         3,958
     Additional paid-in capital.............................      276,296       284,459
     Retained earnings......................................       31,041        63,619
     Accumulated other comprehensive income (loss)..........       (3,380)       (3,473)
     Treasury stock (3,899 shares in 1999), at cost.........           --       (64,222)
                                                                 --------      --------
       Total stockholders' equity...........................      307,840       284,341
                                                                 --------      --------
                                                                 $386,548      $360,158
                                                                 ========      ========
</TABLE>


The accompanying notes are an integral part of these consolidated financial
statements.




                                       10
<PAGE>   11




                    IDEXX LABORATORIES, INC. AND SUBSIDIARIES

                      CONSOLIDATED STATEMENTS OF OPERATIONS
                      (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                       YEARS ENDED DECEMBER 31,
                                               ---------------------------------------
                                                   1997          1998          1999
                                               ------------  ------------   ----------

<S>                                              <C>           <C>           <C>
 Revenue....................................     $ 262,970     $ 319,889     $ 356,214
 Cost of revenue............................       141,030       161,698       182,117
                                                 ---------     ---------     ---------
    Gross profit............................       121,940       158,191       174,097
                                                 ---------     ---------     ---------
 Expenses:
    Sales and marketing.....................        66,383        62,844        56,912
    General and administrative..............        42,930        43,558        43,055
    Research and development................        17,057        22,687        27,313
    Non-recurring operating charge..........        21,300            --            --
    Write-off of in-process research and
    development.............................        13,200        37,162            --
                                                 ---------     ---------     ---------
      Income (loss) from operations.........       (38,930)       (8,060)       46,817
    Interest income, net....................         6,670         6,877         5,728
                                                 ---------     ---------     ---------
      Net income (loss) before provision for
       (benefit of) income taxes............       (32,260)       (1,183)       52,545
 Provision for (benefit of) income taxes....       (11,140)       14,032        19,967
                                                 ---------     ---------     ---------
      Net income (loss).....................     $ (21,120)    $ (15,215)    $  32,578
                                                 =========     =========     =========
 Earnings (loss) per share: Basic...........     $   (0.56)    $   (0.40)    $    0.85
                                                 =========     =========     =========
 Earnings (loss) per share: Diluted.........     $   (0.56)    $   (0.40)    $    0.82
                                                 =========     =========     =========
</TABLE>

The accompanying notes are an integral part of these consolidated financial
statements.




                                       11
<PAGE>   12




                    IDEXX LABORATORIES, INC. AND SUBSIDIARIES

                 CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
                      (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                      COMMON STOCK
                                  ---------------------                                   ACCUMULATED
                                                            ADDITIONAL                       OTHER                        TOTAL
                                    NUMBER      $0.10         PAID-IN        RETAINED    COMPREHENSIVE    TREASURY    STOCKHOLDERS'
                                  OF SHARES   PAR VALUE       CAPITAL        EARNINGS    INCOME (LOSS)      STOCK        EQUITY
                                  ---------   ---------     ----------       --------    -------------    --------    ------------
<S>                                  <C>         <C>         <C>             <C>            <C>           <C>            <C>
BALANCE, December 31, 1996 ....      37,774      $3,777      $ 253,118       $ 67,376       $(1,546)      $     --       $ 322,725

Issuance of common stock in
   settlement of VetTest
   acquisition.................           6           1             87             --            --             --              88
Exercise of stock options,
   including the tax benefit ..         389          39          4,070             --            --             --           4,109
Comprehensive income (loss):
   Net loss ...................          --          --             --        (21,120)           --             --              --
   Translation adjustment .....          --          --             --             --        (3,069)            --              --
   Total comprehensive loss ...          --          --             --             --            --             --         (24,189)
                                     ------      ------      ---------       --------       -------       --------       ---------
BALANCE, December 31, 1997 ....      38,169       3,817        257,275         46,256        (4,615)            --         302,733

Issuance of common stock in
   settlement of Idetek, Inc.
   escrow                                22           2             (2)            --            --             --              --
Issuance of common stock and
   Warrants for acquisition of
   Blue Ridge Pharmaceuticals,
    Inc .......................          --          --         12,323             --            --             --          12,323
Exercise of stock options,
   Including the tax benefit ..         640          64          6,700             --            --             --           6,764
Comprehensive income (loss):
   Net loss ...................          --          --             --        (15,215)           --             --              --
   Translation adjustment .....          --          --             --             --         1,235             --              --
   Total comprehensive loss ...          --          --             --             --            --             --         (13,980)
                                     ------      ------      ---------       --------       -------       --------       ---------
BALANCE, December 31, 1998 ....      38,831       3,883        276,296         31,041        (3,380)            --         307,840

Issuance of common stock to
   board of directors .........          13           1            342             --            --             --             343
Purchase of treasury stock ....          --          --             --             --            --        (64,222)        (64,222)
Exercise of stock options,
   Including the tax benefit ..         740          74          7,821             --            --             --           7,895
Comprehensive income (loss):
   Net income .................          --          --             --         32,578            --             --              --
   Translation adjustment .....          --          --             --             --           (93)            --              --
   Total comprehensive income .          --          --             --             --            --             --          32,485
                                     ------      ------      ---------       --------       -------       --------       ---------
BALANCE, December 31, 1999 ....      39,584      $3,958      $ 284,459       $ 63,619       $(3,473)      $(64,222)      $ 284,341
                                     ======      ======      =========       ========       =======       ========       =========
</TABLE>

The accompanying notes are an integral part of these consolidated financial
statements.




                                       12
<PAGE>   13


                    IDEXX LABORATORIES, INC. AND SUBSIDIARIES

                      CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (IN THOUSANDS)

<TABLE>
<CAPTION>
                                                                   YEARS ENDED DECEMBER 31,
                                                         ----------------------------------------
                                                             1997           1998           1999
                                                         ----------      ----------     ---------

<S>                                                      <C>             <C>             <C>
Cash Flows From Operating Activities:
 Net income (loss) ................................      $ (21,120)      $ (15,215)      $  32,578
  Adjustments to reconcile net income (loss) to net
    cash provided by operating activities
     Depreciation and amortization ................         14,425          15,887          17,209
     Provision for (benefit of) deferred income tax        (14,710)            419           2,019
     Non-cash  portion of  non-recurring  operating
      charge ......................................          1,600              --              --
     Non-cash write-off of in-process research and
      Development .................................         13,200          37,162              --
  Changes in assets and liabilities, net of
     Acquisition(s)
      Accounts receivable .........................         23,712            (528)        (10,406)
      Inventories .................................        (11,218)          4,949           5,182
      Other current assets ........................         (8,400)          2,781           1,169
      Accounts payable ............................         (7,200)         14,344          (7,169)
      Accrued expenses ............................         23,693         (12,569)         10,058
      Deferred revenue ............................           (483)         (1,160)          1,979
                                                         ---------       ---------       ---------
       Net cash provided by operating activities ..         13,499          46,070          52,619
                                                         ---------       ---------       ---------
Cash Flows From Investing Activities:
  Decrease (increase) in investments, net .........          6,515              48         (25,765)
  Purchases of property and equipment .............        (12,507)         (8,992)         (8,292)
  Increase in other assets ........................         (3,699)           (369)         (1,229)
  Proceeds from sale of business ..................             --              --             350
  Acquisition(s) of business(es), net of
   cash acquired ..................................        (23,047)        (39,091)         (4,088)
                                                         ---------       ---------       ---------
     Net cash used in investing activities ........        (32,738)        (48,404)        (39,024)
                                                         ---------       ---------       ---------
Cash Flows From Financing Activities:
  Repayment of notes payable ......................         (1,509)         (2,529)         (6,411)
  Purchase of treasury stock ......................             --              --         (64,222)
  Proceeds from the exercise of stock options .....          3,048           5,756           6,611
                                                         ---------       ---------       ---------
    Net cash provided (used) by financing .........
     activities ...................................          1,539           3,227         (64,022)
                                                         ---------       ---------       ---------
Net effect of Exchange Rate Changes ...............         (3,069)          1,198             (60)
                                                         ---------       ---------       ---------
Net Increase (Decrease) in Cash and Cash
     Equivalents ..................................        (20,769)          2,091         (50,487)
Cash and Cash Equivalents, Beginning of Year ......        127,741         106,972         109,063
                                                         ---------       ---------       ---------
Cash and Cash Equivalents, End of Year ............      $ 106,972       $ 109,063       $  58,576
                                                         =========       =========       =========
Supplemental Disclosure of Cash Flow Information:
 Interest paid during the year ....................      $     405       $     369       $     405
                                                         =========       =========       =========
  Income taxes paid during the year ...............      $   8,706       $  17,385       $  12,827
                                                         =========       =========       =========
Supplemental Disclosure of Noncash Financing
Activity:
  Issuance of common stock in settlement of VetTest
   Acquisition ....................................      $      88       $      --       $      --
                                                         =========       =========       =========
  Issuance of notes, common stock and warrants for
   Acquisition of Blue Ridge Pharmaceuticals, Inc.       $      --       $  20,153       $      --
                                                         =========       =========       =========
  Receipt of note for sale of assets of IDEXX Food
   Safety Net, Inc. ..............................       $      --       $      --       $     195
                                                         =========       =========       =========
</TABLE>



The accompanying notes are an integral part of these consolidated financial
statements.



                                       13
<PAGE>   14


                    IDEXX LABORATORIES, INC. AND SUBSIDIARIES

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(1) OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES

    IDEXX Laboratories, Inc. and subsidiaries (the "Company") develop,
manufacture and distribute products and provide services for the veterinary,
food and environmental markets. In the veterinary market, the Company develops,
manufactures and distributes biology-based detection systems, develops and
distributes veterinary pharmaceuticals and chemistry-based detection systems,
provides laboratory testing and specialized consulting services and develops and
distributes veterinary practice information management software systems and
provides related services. In the food and environmental market, the Company
develops, manufactures and distributes biology-based detection systems and
provides laboratory testing and specialty consulting services. The Company's
products and services are sold worldwide.

    The accompanying consolidated financial statements reflect the application
of certain significant accounting policies, as discussed below and elsewhere in
the notes to the consolidated financial statements. The preparation of these
consolidated financial statements in conformity with generally accepted
accounting principles requires management to make estimates and assumptions that
affect the reported amounts of assets and liabilities at the date of the
financial statements and the reported amounts of revenues and expenses during
the reporting period. Actual results could differ from those estimates.

(a) Consolidation

    The accompanying consolidated financial statements include the accounts of
the Company and its wholly-owned subsidiaries. All material intercompany
transactions and balances have been eliminated in consolidation.

(b) Inventories

    Inventories include material, labor and overhead, and are stated at the
lower of cost (first-in, first-out) or market. The components of inventories are
as follows (in thousands):

                                          DECEMBER 31,
                                     --------------------
                                       1998         1999
                                     -------      -------
                Raw materials.....   $ 4,871      $ 6,385
                Work-in-process...     3,704        4,190
                Finished goods....    46,853       36,913
                                     -------      -------
                                     $55,428      $47,488
                                     =======      =======

(c) Depreciation and Amortization

    The Company provides for depreciation and amortization using the
declining-balance and straight-line methods by charges to operations in amounts
that allocate the cost of property and equipment over their estimated useful
lives as follows:

                                                      ESTIMATED
                    ASSET CLASSIFICATION             USEFUL LIFE
                ---------------------------        --------------

                Leasehold improvements...........  Life of lease
                Machinery and equipment..........  3-5 Years
                Office furniture and equipment...  5-7 Years
                Buildings........................  40 Years




                                       14
<PAGE>   15



(d) Other Assets

    Other assets are as follows (in thousands):
                                                           DECEMBER 31,
                                                       -------------------
                 DESCRIPTION           USEFUL LIFE      1998        1999
          -----------------------    --------------    -------     -------

          Patents and trademarks.    10 Years          $ 9,372     $ 9,318
          Goodwill...............    5-40 Years         50,826      55,187
          Non-compete agreements.    3-5 Years           4,330       4,480
          Other intangibles......    5-10 Years         11,146      11,622
                                                       -------     -------
                                                        75,674      80,607
          Accumulated amortization                      21,858      29,138
                                                       -------     -------
          Intangible assets, net.                       53,816      51,469
          Other assets...........                       10,609      11,207
                                                       -------     -------
                                                       $64,425     $62,676
                                                       =======     =======

    Substantially all of the patents and trademarks were acquired in connection
with the acquisition of a product line of VetTest S.A. ("VetTest") in 1992.
Other intangibles include subscriber lists, existing technology intangible
assets, and prepaid royalties. Other assets include the long-term deferred tax
asset, cost of products sold to customers with right of return privileges (see
Note 1(g)) and long-term deposits. Amortization of intangible assets was $5.0
million, $6.0 million and $7.5 million for the years ended December 31, 1997,
1998 and 1999, respectively. The Company continually assesses the realizability
of these assets in accordance with Statement of Financial Accounting Standards
("SFAS") No. 121, Accounting for the Impairment of Long-Lived Assets and for
Long-Lived Assets To Be Disposed Of. As of the respective balance sheet dates
the Company determined that no impairment has occurred.

(e) Stock-Based Compensation Plans

         The Company accounts for stock-based compensation plans under the
provisions of SFAS No. 123, Accounting for Stock-Based Compensation (SFAS No.
123). Under SFAS No. 123, the Company elected the disclosure only method and
will continue to account for stock-based compensation plans under Accounting
Principles Board ("APB") Opinion No. 25, Accounting for Stock Issued to
Employees (See Note 9).

(f) Income Taxes

    The Company accounts for income taxes under SFAS No. 109, Accounting for
Income Taxes. This statement requires that the Company recognize a current tax
liability or asset for current taxes payable or refundable and a deferred tax
liability or asset for the estimated future tax effects of temporary differences
and carryforwards to the extent they are realizable (See Note 2).

(g) Revenue Recognition

    The Company recognizes product revenue at the time of shipment for
substantially all products. The Company recognizes revenue from non-cancelable
software licenses upon product shipment as collection is probable and no
significant vendor obligations remain at the time of shipment. Service revenue
is recognized at the time the service is performed. Maintenance revenue is
billed in advance and recognized over the life of the contracts, usually one
year or less. Certain instrument systems are sold to a third-party finance
company who leases these systems to its customers with a right-of-return
privilege. The third-party finance company can return the instrument system to
the Company for a partial refund based on the time from initial sale to product
return. The Company recognizes revenue under these contracts over the term of
the underlying lease contract.

(h) Research and Development and Software Development Costs

    In accordance with SFAS No. 86, Accounting for the Costs of Computer
Software to be Sold, Leased or Otherwise Marketed, the Company has evaluated the
establishment of technological feasibility of its various products during the
development phase. Due to the dynamic changes in the market, the Company has
concluded that it cannot determine technological feasibility until the
development phase of the project is nearly complete. The Company charges all
research and development expenses to operations in the period incurred as the
costs from the point of technological feasibility to first product release are
immaterial.



                                       15
<PAGE>   16

(i) Foreign Currency Translation and Foreign Exchange Contracts

    Assets and liabilities of the Company's foreign subsidiaries are translated
using the exchange rate in effect at the balance sheet date. Revenue and expense
accounts are translated using a weighted average of exchange rates in effect
during the period. Cumulative translation gains and losses are shown in the
accompanying consolidated balance sheets as a separate component of accumulated
other comprehensive income (loss). Exchange gains and losses arising from
transactions denominated in foreign currencies are included in current
operations. Included in general and administrative expenses are foreign currency
transaction losses of $511,000 and $127,000 and a gain of $597,000 for the years
ended December 31, 1997, 1998 and 1999, respectively.

    The Company enters into foreign currency exchange contracts of its
anticipated intercompany and third party inventory purchases for the next twelve
months in order to minimize the impact of foreign currency fluctuations on these
transactions. The Company's accounting policies for these contracts are based on
the Company's designation of such instruments as hedging transactions which are
supported by firm third-party purchases. The Company also utilizes some natural
hedges to mitigate its transaction and commitment exposures. The contracts the
Company enters into are firm foreign currency commitments, and therefore market
gains and losses are deferred until the contract matures, which is the period
when the related obligation is settled. The Company enters into these exchange
contracts with large multinational financial institutions. As of December 31,
1998, the deferred gains on these contracts totaled $20,000. There were no
unrecorded gains or losses on these contracts as of December 31, 1999. The
foreign currency contracts, which extend through December 31, 1999 and 2000,
respectively, consisted of the following (in thousands):


            CURRENCY SOLD              US DOLLAR EQUIVALENT
            -------------         ------------------------------
                                        1998            1999
                                  ---------------  -------------
        Australian dollar....          $2,394          $   --
        Japanese Yen.........           2,469             504
                                       ------          ------
                                       $4,863          $  504
                                       ======          ======

(j) Disclosure of Fair Value of Financial Instruments and Concentration of
Credit Risk

    Financial instruments consist mainly of cash and cash equivalents, accounts
receivable, accounts payable and notes payable. The Company does not believe
significant credit risk exists at December 31, 1999. The carrying amounts of the
Company's financial instruments approximate fair market value.

(k) Earnings (Loss) per Share

    Basic earnings per share is computed by dividing net income (loss) by the
weighted average number of shares of Common Stock outstanding during the year.
The computation of diluted earnings per share is similar to the computation of
basic earnings per share, except that the denominator is increased for the
assumed exercise of dilutive options using the treasury stock method unless the
effect is antidilutive. The following is a reconciliation of shares outstanding
for basic and diluted earnings (loss) per share (in thousands):

<TABLE>
<CAPTION>
                                                                        1997    1998    1999
                                                                       ------  ------  -----
<S>                                                                    <C>     <C>     <C>
  SHARES OUTSTANDING FOR BASIC EARNINGS (LOSS) PER SHARE:
  Weighted average shares outstanding................................  37,974  38,513  38,412
                                                                       ======  ======  ======
  SHARES OUTSTANDING FOR DILUTED EARNINGS (LOSS) PER SHARE:
  Weighted average shares outstanding................................  37,974  38,513  38,412
  Shares assumed issued for the acquisition of Blue Ridge
     Pharmaceuticals, Inc............................................      --      --     115
  Dilutive effect of options issued to employees.....................      --      --   1,216
                                                                       ------  ------  ------
                                                                       37,974  38,513  39,743
                                                                       ======  ======  ======
</TABLE>

    The Company incurred losses for the years ending December 31, 1997 and 1998
and has, as a result, excluded the dilutive effect of options issued to
employees and assumed shares issued from the calculation of shares outstanding
for diluted earnings per share. If the Company had reported net income, shares
outstanding would have increased by 1,444,000 and 1,720,000 shares,
respectively. 729,000, 313,000 and 1,294,000 options for 1997, 1998 and 1999,
respectively, have been excluded from the calculation of shares outstanding for
diluted earnings (loss) per share because they were anti-dilutive.

(l) Reclassifications

    Reclassifications have been made in the consolidated financial statements to
conform to the current year's presentation.



                                       16
<PAGE>   17

(m) Comprehensive Income

    In 1998, the Company adopted the provisions of SFAS No. 130, Reporting
Comprehensive Income (SFAS No. 130), which requires companies to report all
changes in equity during a period, except those resulting from investment by
owners and distribution to owners, in a financial statement for the period in
which they are recognized. The Company has chosen to disclose comprehensive
income, which encompasses net income and foreign currency translation
adjustments, in the Consolidated Statement of Stockholders' Equity. The Company
considers the foreign currency cumulative translation adjustment to be
permanently invested and therefore has not provided income taxes on those
amounts. Prior years have been restated to conform to SFAS No. 130 requirements.

(n) New Accounting Standards

    In June 1998, the FASB issued SFAS No. 133, Accounting for Derivative
Instruments and Hedging Activities (SFAS No. 133). SFAS No. 133 establishes
accounting and reporting standards for derivative instruments and for hedging
activities and requires that an entity recognize all derivatives as either
assets or liabilities on the balance sheet and measure those instruments at fair
value. The accounting for changes in the fair value of a derivative depends on
the intended use of the derivative and the resulting designation. SFAS No. 137,
Accounting for Derivative Instruments and Hedging Activities - Deferral of the
Effective Date of FASB Statement No. 133 - an amendment of FASB Statement No.
133 was issued in June 1999 and deferred the effective date of SFAS No. 133 to
fiscal years beginning after June 15, 2000 and is applicable on both an interim
and annual basis. Companies are not required to apply this statement
retroactively to prior periods. The Company does not believe this statement will
have a material impact on the consolidated balance sheet or statement of
operations.

(2) INCOME TAXES

    Earnings (losses) before income taxes for each year were as follows (in
thousands):

                            1997        1998       1999
                          --------   ---------  -------
         Domestic.....    $ (29,731) $ (16,071) $ 37,253
         International....   (2,529)    14,888    15,292
                          ---------  ---------  --------
                          $ (32,260) $  (1,183) $ 52,545
                          =========  =========  ========

         The provisions for (benefit of) income taxes for the years ended
December 31, 1997, 1998 and 1999 are comprised of the following (in thousands):

                                   DECEMBER 31,
                      -------------------------------------
                        1997           1998           1999
                      --------       --------       -------
Current
  Federal ......      $    817       $  5,758       $10,630
  State ........           954          2,682         3,066
  International          1,799          5,173         4,252
                      --------       --------       -------
                         3,570         13,613        17,948
                      --------       --------       -------
Deferred
  Federal ......       (12,314)           524         1,955
  State ........        (2,396)          (105)           64
                      --------       --------       -------
                       (14,710)           419         2,019
                      --------       --------       -------
                      $(11,140)      $ 14,032       $19,967
                      ========       ========       =======

    The provision for (benefit of) income taxes differs from the amount computed
by applying the statutory federal income tax rate as follows:

                                               DECEMBER 31,
                                      ----------------------------
                                       1997      1998        1999
                                      ------   --------    -------
  U.S. federal statutory rate...        35.0%      35.0%     35.0%
  State income tax, net of federal
   tax benefit...............            4.1     (217.7)      5.0
  International income taxes..            --      125.0      (2.1)
  Amortization of non-deductible
    Assets....................          (1.6)    (183.1)      2.2

  Write-off of in-process
    research and development..          (5.1)  (1,098.6)       --
  Non-taxable interest income.           4.1      117.9      (2.9)
  Other, net..................          (2.0)      35.4       0.8
                                      ------   --------    ------
  Effective tax rate..........          34.5%  (1,186.1)%    38.0%
                                      ======   ========    ======


                                       17
<PAGE>   18

    The components of the domestic net deferred tax asset (liability) included
in the accompanying consolidated balance sheets are as follows (in thousands):

                                          1998                     1999
                                 ---------------------     ---------------------
                                 CURRENT     LONG-TERM     CURRENT     LONG-TERM
                                 -------     ---------     -------     ---------
ASSETS:
   Accruals .................    $ 4,323      $    --      $ 4,531      $   --
   Receivable reserves ......      3,173           --        2,451          --
   Deferred revenue .........      4,189           --        3,267          --
   Inventory basis
    differences .............      2,301           --        3,017          --
   Intangible basis
    differences .............         --        6,389           --       6,732
   Tax credit carryforwards..         --          235          433          --
   Net operating loss
   carryforwards ............         --        4,434        1,098       1,482
                                 -------      -------      -------      ------
    Total assets ............     13,986       11,058       14,797       8,214
                                 -------      -------      -------      ------
LIABILITIES:
   Property basis differences         --          928           --       1,106
   Intangible basis
    Differences .............         --          470           --         173
   Other ....................         21           --          118          --
                                 -------      -------      -------      ------
    Total liabilities .......         21        1,398          118       1,279
                                 -------      -------      -------      ------
   Net domestic asset .......    $13,965      $ 9,660      $14,679      $6,935
                                 =======      =======      =======      ======




The components of the foreign net deferred tax asset (in thousands):

                                      1998                        1999
                               --------------------      ---------------------
                               CURRENT    LONG-TERM      CURRENT     LONG-TERM
                               -------    ---------      -------     ---------
ASSETS:
   Net operating loss
    carryforwards .........    $  --       $ 3,679       $    --      $ 3,197
   Other ..................      135            --            --           --
                               -----       -------       -------      -------
    Total assets ..........      135         3,679            --        3,197
LIABILITIES:
    Total liabilities .....       --            --            --           --
VALUATION ALLOWANCE .......     (135)       (3,679)           --       (3,197)
                               -----       -------       -------      -------
    Net asset (liability)..    $  --       $    --       $    --      $    --
                               =====       =======       =======      =======

    At December 31, 1999, the Company had domestic net operating loss
carryforwards of approximately $7.4 million available to offset future taxable
income. Net operating loss carryforwards expire at various dates from 2000 to
2014. The Tax Reform Act of 1986 contains provisions that limit annual
availability of the net operating loss carryforwards due to a more than 50%
change in ownership that occurred upon the acquisition of certain companies.

    At December 31, 1999, the Company had net operating loss carryforwards in
foreign subsidiaries of approximately $8.1 million available to offset future
taxable income. These net operating loss carryforwards expire at various dates
beginning in 2003. The Company has recorded a valuation allowance for the assets
because realizability is uncertain.

    As of December 31, 1999, unremitted earnings in subsidiaries outside the
United States totaled $21.9 million, on which no United States taxes have been
provided. The Company's intention is to reinvest these earnings permanently or
to repatriate the earnings only when tax effective to do so. It is not practical
to estimate the amount of additional taxes that might be payable upon
repatriation of foreign earnings; however, the Company believes that United
States foreign tax credits would largely eliminate any United States taxes or
offset any foreign withholding taxes.



                                       18
<PAGE>   19

(3) CASH EQUIVALENTS, SHORT-TERM AND LONG-TERM INVESTMENTS

    The Company accounts for investments under SFAS No. 115, Accounting for
Certain Investments in Debt and Equity Securities. Except for preferred stock,
the Company has the intent and ability to hold short-term and long-term
investments to maturity and records these investments at amortized cost which
approximates fair market value. The Company classifies its investment in
preferred stock as available-for-sale and values it at fair market value.

    Cash equivalents are short-term, highly liquid investments with original
maturities of less than three months. Short-term investments are investment
securities with original maturities of greater than three months but less than
one year and consist of the following (in thousands):

                                       DECEMBER 31,
                                   --------------------
                                     1998        1999
                                   -------     --------
Municipal bonds .............      $21,801      $24,785
Preferred stocks ............           --        9,120
U.S. government obligations .        6,000        8,000
Certificates of deposit .....        1,031        4,930
Commercial paper ............          458           --
                                   -------      -------
                                   $29,290      $46,835
                                   =======      =======

    Long-term investments are investment securities with original maturities of
greater than one year and consist of the following (in thousands):

                                      DECEMBER 31,
                                 --------------------
                                   1998         1999
                                 -------      -------

Municipal bonds ...........      $13,297      $23,517
Certificates of deposit ...        4,000           --
U.S. government obligations           --        2,000
                                 -------      -------

                                 $17,297      $25,517
                                 =======      =======

(4) NOTES PAYABLE

    In connection with the acquisition of the business of Consolidated
Veterinary Diagnostics, Inc. ("CVD") in July 1996, the Company issued an
unsecured note payable for $3.0 million, of which $1.0 million was outstanding
at December 31, 1998. The final installment payment of $1 million was made in
July 1999.

    In connection with the Central Veterinary Diagnostic Laboratory acquisition
(see Note 15(f)) the Company issued an unsecured note payable for Australian
Dollars 900,000 (US $587,000) of which Australian dollars 675,000 (US $439,000)
was outstanding at December 31, 1999. The note bears interest at 6% and is due
in four equal annual installments beginning in December 1998.

    In connection with the Blue Ridge Pharmaceuticals, Inc. ("Blue Ridge")
acquisition (see Note 15(e)), the Company issued unsecured notes payable for
$7,830,000, of which $3,103,000 was outstanding at December 31, 1999. The notes
bear interest at 5.5%, and the final installment is due on October 1, 2000.

(5) COMMITMENTS AND CONTINGENCIES

    The Company leases its facilities under operating leases which expire
through 2008. In addition, the Company is responsible for the real estate taxes
and operating expenses related to these facilities. Minimum annual rental
payments under these agreements are as follows (in thousands):

                            YEARS ENDING
                            DECEMBER 31,
                          ---------------
                          2000 ..........      $ 4,832
                          2001 ..........        4,522
                          2002 ..........        3,615
                          2003 ..........        3,347
                          2004 ..........        2,828
                          Thereafter ....        9,578
                                               -------
                                               $28,722
                                               =======



                                       19
<PAGE>   20




    Rent expense charged to operations under operating leases was approximately
$3.8 million, $4.9 million and $5.1 million for the years ended December 31,
1997, 1998 and 1999, respectively.

    Under the terms of certain supply agreements with suppliers of the Company's
hematology instruments and consumables, slides for its VetTest instruments, and
certain raw materials, the Company has aggregate commitments to purchase
approximately $35.6 million of products in 2000.

    From time to time the Company has received notices alleging that the
Company's products infringe third-party proprietary rights. In particular, the
Company has received notices claiming that certain of the Company's immunoassay
products infringe third-party patents. The Company is not aware of any pending
litigation with respect to such claims. Patent litigation frequently is complex
and expensive, and the outcome of patent litigation can be difficult to predict.
There can be no assurance that the Company will prevail in any infringement
proceedings that have been or may be commenced against the Company.

    In January 1998, a complaint was filed in the U.S. District Court for the
District of Maine captioned ROBERT A. ROSE, et.al. v. DAVID E. SHAW, ERWIN F.
WORKMAN, JR. and IDEXX LABORATORIES, INC. The plaintiffs purport to represent a
class of purchasers of the common stock of the Company from July 19, 1996
through March 24, 1997. The complaint claims that the defendants violated
Section 10(b) of the Securities Exchange Act of 1934 and Securities and Exchange
Commission Rule 10b-5 promulgated pursuant thereto, by virtue of false or
misleading statements made during the class period. The complaint also claims
that the individual defendants are liable as "control persons" under Section
20(a) of that Act. In addition, the complaint claims that the individual
defendants sold some of their own common stock of the Company, during the class
period, at times when the market price for the stock allegedly was inflated. In
July 1999, the U.S. District Court granted the Company's motion to dismiss the
case for failure to state a claim. However in August 1999, the plaintiffs
appealed that ruling to the U.S. Court of Appeals for the First Circuit. In
February 2000, the Company entered into a Memorandum of Understanding (the
"MOU") with the plaintiffs pursuant to which the parties have agreed to settle
the suit. Pursuant to the MOU, the Company and the plaintiffs have filed a
Stipulation of Settlement (the "Stipulation") with U.S. District Court. Subject
to certain conditions, the Stipulation will become effective following approval
by the District Court and expiration of the time for any appeal. No assurance
can be given that the District Court will approve the Stipulation or otherwise
that the suit will be finally settled on the terms contained in the MOU. The
proposed settlement (in excess of the portion reimbursed through insurance) will
not affect results of operations in 2000. In the event that the suit is not
settled, the Company is unable to assess the likelihood of an adverse result or
estimate the amount of damages which the Company may be required to pay. Any
adverse outcome resulting in the payment of damages would adversely affect the
Company's results of operations.

    In December 1997, SA Scientific, Inc. ("SAS") filed suit against the Company
in the State of Texas District Court. SAS has alleged breach of a development
and supply agreement between SAS and the Company, negligent misrepresentation,
fraud and conversion of SAS's intellectual property, and is seeking $8,000,000
in actual damages, $24,000,000 in punitive damages, further unspecified damages
and attorneys' fees. The Company has filed an answer to the complaint denying
SAS's allegations and has asserted counterclaims against SAS for breach of
contract, fraud and conversion of the Company's property. The Company believes
that it has meritorious defenses to SAS's claims and is contesting the matter
vigorously. However, the Company is unable to assess the likelihood of an
adverse result or estimate the amount of damages the Company might be required
to pay. Any adverse outcome resulting in payment of damages would adversely
affect the Company's results of operations.



                                       20
<PAGE>   21





(6) NON-RECURRING OPERATING CHARGE

    During 1997 the Company recorded a non-recurring operating charge of $34.5
million. The non-recurring operating charge included a $13.2 million write-off
of in-process research and development (see Note 7) and $21.3 million of the
write-downs and write-offs of certain assets and accrual of costs related to a
significant workforce reduction. The $21.3 million charge consists of the
following (in thousands):

             Legal settlement and related costs ......      $ 8,000
             Severance benefits and related costs ....        9,000
             Idle capacity and lease termination costs        2,700
             Asset impairment ........................        1,600
                                                            -------
                                                            $21,300
                                                            =======

    As of December 31, 1999, $653,000 was included in accrued expenses relating
to the non-recurring operating charge. The balance remaining at December 31,
1999 primarily represents severance payments due to terminated employees and
lease payments on unutilized facilities. During 1999, the Company paid $2.6
million related to this charge.

    In September 1997, the Company settled a patent infringement suit brought by
Barnes-Jewish Hospital ("BJH") regarding IDEXX's heartworm diagnostic products.
The total costs of the settlement, including legal fees, were included in the
non-recurring operating charge.

    The Company has terminated the employment of a total of 228 employees. Of
this total, 79 employees were associated with the consolidation of the
veterinary practice information management software business into the Eau
Claire, Wisconsin facility, 57 employees were associated with the consolidation
of sales, marketing and distribution operations in Europe, 33 employees were
associated with reductions in domestic sales and marketing operations, 18
employees were associated with reductions in sales and marketing operations in
the Asia-Pacific region, 16 employees were associated with the closure of the
Sunnyvale, California research and development facility and 25 employees were
associated with reductions in positions in management and financial operations.

    As discussed above, the Company consolidated certain veterinary practice
information management software operations into the Eau Claire, Wisconsin
facility and closed the leased Sunnyvale, California research and development
facility. As a result of these consolidations, the Company has leased facilities
which have become excess until the end of their respective lease terms.
Additionally, the Company has determined that it will not pursue certain
immunoassay technology with respect to which it had invested a total of $1.6
million in fixed assets and license fees.

(7) WRITE-OFF OF IN-PROCESS RESEARCH AND DEVELOPMENT

(a)      Blue Ridge Pharmaceuticals, Inc.

    On October 1, 1998 the Company acquired Blue Ridge Pharmaceuticals, Inc., a
development-stage animal health pharmaceutical company with 11 products in
development. At the acquisition date Blue Ridge had no commercially viable
products and no historical revenue stream. The Company allocated the aggregate
purchase price of $59.2 million plus $300,000 of acquisition costs based on the
fair market value of tangible and intangible assets acquired, in accordance with
Accounting Principles Board Opinion No. 16 (APB 16). The acquisition was
accounted for as a purchase in accordance with APB 16 and the results of
operations have been included with the Company's results since the date of
acquisition. To value the intangible assets acquired the Company obtained an
independent appraisal. That appraisal was performed using proven valuation
techniques and supplemental guidance provided by the Securities and Exchange
Commission. The aggregate purchase price was allocated as follows (in
thousands):

            Current assets, including cash of $1,243      $  1,882
            Long-term assets .......................           118
            Deferred tax assets ....................         3,444
            Current liabilities ....................        (3,400)
            Intangibles ............................           200
            In-process research and development ....        37,162
            Goodwill ...............................        20,094
                                                          --------
                                                          $ 59,500
                                                          ========



                                       21
<PAGE>   22


    Intangibles include $37.2 million for purchased in-process research and
development for projects that do not have future alternative uses. This
allocation represents the estimated fair value based on discounted risk-adjusted
cash flows, adjusted using percentage of completion methodology (see below),
related to the in-process research and development projects. The development of
these projects had not yet reached technological feasibility and the in-process
research and development had no alternative uses. Accordingly, these costs were
expensed as of the acquisition date in accordance with FASB Interpretation No.
4, Applicability of FASB Statement No. 2 to Business Combinations Accounted for
by the Purchase Method.

    Eight of the eleven projects were pharmaceuticals for companion animals,
including horses, and three of the eleven projects were pharmaceuticals for food
animals. These projects use a combination of proprietary compounds and novel
delivery systems. To be sold commercially the products must be approved by the
Center for Veterinary Medicine ("CVM"), which is the agency within the Food and
Drug Administration ("FDA") that is responsible for managing approval of new
animal drugs. There are five types of data that must be provided to the FDA and
the CVM prior to approval. These include 1) efficacy, 2) safety to the animals
to be treated, 3) safety to the humans who will consume the animal or its
products (if applicable), 4) safety to the environment and 5) good manufacturing
practices (quality control of production to assume a consistent product). The
Company utilizes clinical studies to support its applications for approval. The
companion animal projects ranged from 19% to 78% complete, while the food animal
projects ranged from 78% to 93% complete.

    These projects are unique and complex and frequently require modification to
the product and the manufacturing process before satisfactory clinical results
can be obtained. The delay in obtaining satisfactory data can result from any of
the five items discussed above and frequently satisfactory results cannot be
obtained.

    Management believes that it is positioned to complete each of the major
research and development programs. These estimates are subject to change, given
the uncertainties of the development process and no assurance can be given that
deviations from these estimates will not occur. Additionally, these projects
will require maintenance expenditures when and if they have reached a state of
technological and commercial feasibility and there is no assurance that each
project will meet either technological or commercial success.

    The value assigned to purchased in-process research and development was
determined by estimating the costs to develop the purchased in-process research
and development into commercially viable products, estimating the percentage of
completion at the acquisition date, estimating the resulting net risk-adjusted
cash flows from the projects considering the percentage of completion and
discounting the net cash flows to their present value. The percentage of
completion for each project was estimated using costs incurred to date compared
to estimated costs at completion. The revenue projections used to value the
in-process research and development are based on estimates of relevant market
sizes and growth factors and nature and expected timing of new products. The
rate utilized to discount the net cash flows to their present value is based on
the weighted average cost of capital adjusted to consider the risk associated
with these technologies. The Company used a 20% discount factor to value this
in-process research and development.

    The forecasts used by the Company in valuing in-process research and
development were based upon assumptions the Company believes to be reasonable
but which are inherently uncertain and unpredictable. The Company's assumptions
may be incomplete or inaccurate and unanticipated events and circumstances are
likely to occur. For these reasons, actual results may vary significantly from
the projected results.



                                       22
<PAGE>   23



(b) Veterinary Practice Information Management Software Companies

    During 1997 the Company acquired two veterinary practice information
management software businesses. The Company allocated the aggregate purchase
price of $19.8 million plus $200,000 of acquisition costs based on the fair
market value of tangible and intangible assets acquired, in accordance with
Accounting Principles Board Opinion No. 16 (APB 16). The acquisition was
accounted for as a purchase in accordance with APB 16 and the results of
operations have been included with the Company's results since the dates of
acquisition. To value the intangible assets acquired the Company obtained an
independent appraisal. That appraisal was performed using proven valuation
techniques and methodologies generally accepted in industry. The aggregate
purchase price was allocated as follows (in thousands):

             Current assets, including cash of $848      $  8,172
             Long-term assets .....................           789
             Current liabilities ..................       (13,377)
             Intangibles ..........................         3,650
             In-process research and development ..        13,200
             Goodwill .............................         7,566
                                                         --------
                                                         $ 20,000
                                                         ========


    Intangibles include $13.2 million for purchased in-process research and
development for projects that do not have future alternative uses. This
allocation represents the estimated fair value based on discounted risk-adjusted
cash flows related to the in-process research and development projects. The
development of these projects had not yet reached technological feasibility and
the in-process research and development had no alternative uses. Accordingly,
these costs were expensed as of the acquisition date in accordance with FASB
Interpretation No. 4, Applicability of FASB Statement No. 2 to Business
Combinations Accounted for by the Purchase Method.

    The two projects consisted of practice information management software
programs and related modules. These products are used by veterinarians to manage
and operate their veterinary clinics. These projects are unique and complex and
frequently require modification to the product before the products are ready for
commercial markets. These projects were completed in accordance with the
original plan. These projects will require maintenance expenditures to maintain
commercial status and there is no assurance that each project will meet
commercial success. The Company realized revenue from these products in 1999.

    The value assigned to purchased in-process research and development was
determined by estimating the costs to develop the purchased in-process research
and development into commercially viable products, estimating the resulting net
risk-adjusted cash flows from the projects and discounting the net cash flows to
their present value. The revenue projections used to value the in-process
research and development are based on estimates of relevant market sizes and
growth factors and nature and expected timing of new products. The rate utilized
to discount the net cash flows to their present value is based on the weighted
average cost of capital adjusted to consider the risk associated with these
technologies. The Company used a 20% discount factor to value this in-process
research and development.

    The forecasts used by the Company in valuing in-process research and
development were based upon assumptions the Company believes to be reasonable
but which are inherently uncertain and unpredictable. The Company's assumptions
may be incomplete or inaccurate and unanticipated events and circumstances are
likely to occur. For these reasons, actual results may vary significantly from
the projected results.

(8) STOCKHOLDERS' EQUITY

(a) Preferred Stock

    The Board of Directors is authorized, subject to any limitations prescribed
by law, without further stockholder approval, to issue from time to time up to
500,000 shares of Preferred Stock, $1.00 par value per share ("Preferred
Stock"), in one or more series. Each such series of Preferred Stock shall have
such number of shares, designations, preferences, voting powers, qualifications
and special or relative rights or privileges as shall be determined by the Board
of Directors, which may include, among others, dividend rights, voting rights,
redemption and sinking fund provisions, liquidation preferences, conversion
rights and preemptive rights.



                                       23
<PAGE>   24


(b) Series A Junior Participating Preferred Stock

    On December 17, 1996, the Company designated 100,000 shares of Preferred
Stock as Series A Junior Participating Preferred Stock ("Series A Stock") in
connection with its Shareholder Rights Plan (see Note 10). In general, each
share of Series A Stock will: (i) be entitled to a minimum preferential
quarterly dividend of $10 per share and to an aggregate dividend of 1000 times
the dividend declared per share of Common Stock, (ii) in the event of
liquidation, be entitled to a minimum preferential liquidation payment of $1,000
per share (plus accrued and unpaid dividends) and to an aggregate payment of
1000 times the payment made per share of Common Stock, (iii) have 1000 votes,
voting together with the Common Stock, (iv) in the event of any merger,
consolidation or other transaction in which Common Stock is exchanged, be
entitled to receive 1000 times the amount received per share of Common Stock and
(v) not be redeemable. These rights are protected by customary antidilution
provisions. There are no shares of Series A Stock outstanding.

(9) STOCK-BASED COMPENSATION PLANS

    At December 31, 1999, the Company had 11 stock-based compensation plans,
which are described below. The Company accounts for these plans under the
provisions of SFAS No. 123. Under SFAS No. 123 the Company elected the
disclosure method and will continue to account for stock-based compensation
plans under APB Opinion No. 25. Accordingly, no compensation cost has been
recognized for these plans. Had compensation cost for the Company's 11
stock-based compensation plans been determined consistent with the provisions of
SFAS No. 123, the Company's net income (loss) and net income (loss) per common
and common equivalent share would have been reduced to the following pro forma
amounts (in thousands):

                                            YEARS ENDED DECEMBER 31,
                                       ---------------------------------
                                         1997        1998         1999
                                       ---------   ---------    --------
        Net income (loss):
           As reported...........      $(21,120)   $(15,215)    $ 32,578
           Pro forma.............       (30,563)    (21,931)      25,550
        Net income (loss) per share:
           Basic: as reported....      $  (0.56)   $  (0.40)    $   0.85
           Basic: pro forma......         (0.80)      (0.57)        0.67
           Diluted: as reported..         (0.56)      (0.40)        0.82
           Diluted: pro forma....         (0.80)      (0.57)        0.64

    Because the SFAS No. 123 method of accounting has not been applied to
options granted prior to January 1, 1995, the resulting pro forma compensation
cost may not be representative of that to be expected in future years.

(a) The 1984 Plan

    During 1984, the Company established a stock option plan (the "1984 Plan"),
under which key employees were granted options to purchase Common Stock at
exercise prices not less than the fair market value as of the date of grant, as
determined by the Board of Directors. On April 24, 1991, the Board of Directors
terminated the 1984 Plan such that no further options may be granted under the
Plan.

(b) The 1991 Plan

    During 1991, the Board of Directors approved the 1991 Stock Option Plan
which, as amended, provides for grants up to 6,475,000 incentive and
nonqualified stock options at the discretion of the Compensation Committee of
the Board of Directors. Incentive Stock Options are granted at the fair market
value on the date of grant and expire 10 years from the date of grant. Incentive
Stock Options for greater than 10% shareholders are granted at 110% of the fair
market value and expire five years from the date of grant. Nonqualified options
may be granted at no less than 100% of the fair market value on the date of
grant. The vesting schedule of all options is determined by the Compensation
Committee of the Board of Directors at the time of grant.



                                       24
<PAGE>   25


(c) The 1991 Director Option Plan

    During 1991, the Board of Directors approved the 1991 Director Option Plan
(as amended, the "1991 Director Plan") pursuant to which Directors who are not
officers or employees of the Company may receive nonstatutory options to
purchase shares of the Company's Common Stock. The time period for granting
options under the 1991 Director Plan expired in accordance with the terms of the
plan in June 1996.

(d) The 1997 Director Option Plan

    During 1997, the Board of Directors approved the 1997 Director Option Plan
(the "1997 Director Plan") pursuant to which Directors who were not officers or
employees of the Company received nonstatutory options to purchase shares of the
Company's Common Stock. On May 19, 1999 this plan was terminated and replaced
with the 1999 Director Stock Plan.

(e) 1998 Stock Incentive Plan

    During 1998, the Board of Directors approved the 1998 Stock Incentive Plan
(the "1998 Stock Plan") which provides for grants of incentive and nonqualified
stock options and restricted stock awards at the discretion of the Compensation
Committee of the Board of Directors. A total of 2,500,000 shares of Common Stock
may be issued under the 1998 Stock Plan. Options granted under the 1998 Stock
Plan may not be granted at an exercise price less than the fair market value of
the Common Stock on the date granted (or less than 110% of the fair market value
in the case of incentive stock options granted to holders of more than 10% of
the Company's Common Stock). Options may not be granted for a term of more than
10 years. The number of shares subject to restricted stock awards granted at
below 100% of fair market value may not exceed 10% of the total number of shares
of Common Stock issuable under the 1998 Stock Plan. The vesting schedule of all
options granted under the 1998 Stock Plan and the duration of the Company's
repurchase rights with respect to restricted stock awarded under the 1998 Stock
Plan are determined by the Compensation Committee of the Board of Directors at
the time of grant.

(f) The 1999 Director Stock Plan

    During 1999, the Board of Directors approved the 1999 Director Stock Plan
pursuant to which Directors who are not officers or employees of the Company may
receive shares of the Company's Common Stock. A total of 80,000 shares of Common
Stock may be issued under the 1999 Director Stock Plan. As of December 31, 1999,
12,860 shares were issued under this plan, and the fair value of these shares of
$343,000 was charged to expense.

(g) ETI Corporation Plan

    During 1991, the Board of Directors of ETI Corporation ("ETI"), which was
acquired by the Company in 1993, approved a Stock Option Plan (the "ETI Plan").
The ETI Plan provided for the grant of up to 100,000 nonqualified stock options
at the discretion of the Board of Directors of ETI. Options were granted at the
fair market value on the date of grant and expire five years from the date of
grant. The options vest over a four-year period from the date of grant.

    In connection with the merger of ETI and the Company, all outstanding ETI
options became exercisable, in accordance with their original vesting schedule,
for shares of the Company's Common Stock at the same rate at which outstanding
shares of ETI common stock were exchanged for shares of the Company's Common
Stock in the merger. In addition, the exercise price for the options was
proportionately adjusted in accordance with the adjustment to the number of
shares.

(h) Idetek, Inc. Plans

    During 1986, the Board of Directors of Idetek approved the 1985 Incentive
Stock Option Plan (the "1985 Idetek Plan"). Options were granted at the fair
market value on the date of grant and expire 10 years from the date of grant.
Options for greater than 10% shareholders were granted at no less than 110% of
the fair market value and expire five years from the date of grant. The 1985
Idetek Plan was terminated by the Board of Directors of Idetek as to future
grants.



                                       25
<PAGE>   26


    During 1987, the Board of Directors of Idetek approved the 1987 Stock Option
Plan (the "1987 Idetek Plan"), which provided for the grant of both incentive
and nonqualified stock options. Incentive Stock Options were granted at the fair
market value on the date of grant and expire 10 years from the date of grant.
Incentive Stock Options for greater than 10% shareholders were granted at 110%
of the fair market value and expire five years from the date of grant.
Nonqualified options were granted at 85% of the fair market value on the date of
grant and expire five years from the date of grant. The Company does not intend
to grant any options under the 1987 Idetek Plan in excess of the options
currently outstanding.

    In February 1996, the Board of Directors of Idetek approved two separate,
single participant fixed term incentive stock option agreements with certain of
its key executive officers. Options were granted to the individual participant
named in the agreement at prices established by the Board of Directors of Idetek
and such options expire 10 years from the date of grant.

    In connection with the merger of Idetek and the Company in August 1996, all
outstanding Idetek options became exercisable, in accordance with their original
vesting schedule or terms, for shares of the Company's Common Stock at the same
rate at which outstanding shares of Idetek common stock were exchanged for
shares of the Company's Common Stock in the merger. In addition, the exercise
price for the options was proportionately adjusted in accordance with the
adjustment to the number of shares.

    A summary of the status of the Company's stock option plans as of December
31, 1997, 1998 and 1999 and changes during the years then ended is presented in
the table and narrative below (in thousands, except weighted average exercise
price):


                                                                      WEIGHTED
                                                          NUMBER       AVERAGE
                                                            OF        EXERCISE
                                                          SHARES        PRICE
                                                          ------      --------
   Outstanding, December 31, 1996 ..................       4,352       $18.41
                                                          ======       ======
      Granted ......................................       1,596       $24.14
      Exercised ....................................        (270)        6.64
      Terminated ...................................         (97)       21.45
      Canceled on repricing, net ...................        (494)       36.85
                                                          ------       ------
   Outstanding, December 31, 1997 ..................       5,087       $12.98
                                                          ======       ======
   Exercisable, December 31, 1997 ..................       2,422       $ 9.03
                                                          ======       ======
   Weighted Average Fair Value of Options Granted in
     1997 ..........................................                   $ 7.70
                                                                       ======
      Granted ......................................       1,233       $17.46
      Exercised ....................................        (555)        7.95
      Terminated ...................................        (386)       16.69
                                                           ------      ------
   Outstanding, December 31, 1998 ..................       5,379       $14.26
                                                          ======       ======
   Exercisable, December 31, 1998 ..................       2,600       $11.17
                                                          ======       ======
   Weighted average fair value of options granted in
     1998 ..........................................                   $ 8.79
                                                                       ======
      Granted ......................................       1,341       $22.51
      Exercised ....................................        (669)        7.35
      Terminated ...................................        (325)       18.45
                                                          ------       ------
   Outstanding, December 31, 1999 ..................       5,726       $16.78
                                                          ======       ======
   Exercisable, December 31, 1999 ..................       2,624       $13.85
                                                          ======       ======
   Weighted average fair value of options granted in
     1999 ..........................................                   $11.21
                                                                       ======


    In April 1997, the Company implemented a Stock Option Exchange Program (the
"Program") for employees in response to the substantial decline in the trading
price of the Company's Common Stock. Under the Program, employees could
voluntarily exchange unexercised stock options and receive new options
exercisable at $17.35 per share. Employees also were required to forfeit between
0% and 50% of their options based on their relative position in the Company.
There were 2.0 million options with a weighted average exercise price of $36.85
that were exchanged for new options. 494,000 net options to acquire shares were
forfeited as a result of the Program. The other terms of the options remained
essentially unchanged. The weighted average fair value of the new options
granted was $13.00 per share.



                                       26
<PAGE>   27


    The fair value of each option grant is estimated on the date of grant using
the Black-Scholes option-pricing model with the following weighted-average
assumptions used for the grants in 1997, 1998 and 1999, respectively: no
dividend yield for all years; expected volatility of 52% for 1997, 64% for 1998,
and 54% for 1999; risk-free interest rates of 6.33%, 5.34% and 5.28% for 1997,
1998 and 1999, respectively; and expected lives of 4.55 years for 1997, 3.96
years for 1998 and 4.62 years for 1999. At December 31, 1999, the options
outstanding have the following characteristics (options in thousands):

                       OPTIONS OUTSTANDING                   OPTIONS EXERCISABLE
                     ----------------------    WEIGHTED      -------------------
                                   WEIGHTED     AVERAGE                WEIGHTED
                     NUMBER        AVERAGE     REMAINING     NUMBER     AVERAGE
  EXERCISE PRICE       OF         EXERCISE     CONTRACT        OF      EXERCISE
      RANGE          OPTIONS        PRICE        LIFE        OPTIONS     PRICE
 ----------------    -------   ------------    ---------     -------   ---------
 $ 1.25 -- $ 9.88      843         $  6.63       2.50          843     $  6.63
   11.22 -- 17.00    1,928           14.61       7.26          817       14.58
   17.35 -- 21.03    1,640           17.95       6.81          758       17.94
   21.88 -- 46.00    1,315           25.00       8.49          206       25.44


(i) Employee Stock Purchase Plans

    During 1994, the Board of Directors approved the 1994 Employee Stock
Purchase Plan whereby the Company had reserved up to an aggregate of 300,000
shares of Common Stock for issuance in semiannual offerings over a three-year
period. During 1997, the Board of Directors approved the 1997 Employee Stock
Purchase Plan whereby the Company has reserved and may issue up to an aggregate
of 420,000 shares of Common Stock in semiannual offerings. Also during 1997 the
Board of Directors approved the 1997 International Employee Stock Purchase Plan
whereby the Company has reserved and may issue up to an aggregate of 30,000
shares of Common Stock in semiannual offerings. Stock is sold under each of
these plans at 85% of fair market value, as defined. Shares subscribed to and
issued under the plans were 119,027 in 1997, 71,734 in 1998 and 66,887 in 1999.

    Under SFAS No. 123, pro forma compensation cost is recognized for the fair
value of the employees' purchase rights, which was estimated using the
Black-Scholes model with the following assumptions for 1997, 1998 and 1999,
respectively: no dividend yield for all years; an expected life of one year for
all years; expected volatility of 72% for 1997, 64% for 1998, and 54% for 1999;
and risk-free interest rates of 6.14%, 5.34% and 5.45% for 1997, 1998 and 1999,
respectively. The weighted-average fair value of those purchase rights granted
in 1997, 1998 and 1999 was $7.15, $6.57 and $7.40 per share, respectively.

(10) PREFERRED STOCK PURCHASE RIGHTS

    On December 17, 1996, the Company adopted a Shareholder Rights Plan and
declared a dividend of one preferred stock purchase right for each outstanding
share of Common Stock to stockholders of record at the close of business on
December 30, 1996. Under certain conditions, each right may be exercised to
purchase one one-thousandth of a share of Series A Stock at a purchase price of
$200. The rights will be exercisable only if a person or group has acquired
beneficial ownership of 20% or more of the Common Stock or commenced a tender or
exchange offer that would result in such a person or group owning 30% or more of
the Common Stock. The Company generally will be entitled to redeem the rights,
in whole, but not in part, at a price of $.01 per right at any time until the
tenth business day following a public announcement that a 20% stock position has
been acquired and in certain other circumstances.

    If any person or group becomes a beneficial owner of 20% or more of the
Common Stock (except pursuant to a tender or exchange offer for all shares at a
fair price as determined by the outside members of the Company's Board of
Directors), each right not owned by a 20% stockholder will enable its holder to
purchase such number of shares of Common Stock as is equal to the exercise price
of the right divided by one-half of the current market price of the Common Stock
on the date of the occurrence of the event. In addition, if the Company
thereafter is acquired in a merger or other business combination with another
person or group in which it is not the surviving corporation or in connection
with which its Common Stock is changed or converted, or if the Company sells or
transfers 50% or more of its assets or earning power to another person, each
right that has not previously been exercised will entitle its holder to purchase
such number of shares of common stock of such other person as is equal to the
exercise price of the right divided by one-half of the current market price of
such common stock on the date of the occurrence of the event.



                                       27
<PAGE>   28





(11) IDEXX RETIREMENT AND INCENTIVE SAVINGS PLAN

    The Company has established the IDEXX Retirement and Incentive Savings Plan
(the "401(k) Plan"). Employees eligible to participate in the 401(k) Plan may
contribute specified percentages of their salaries, a portion of which will be
matched by the Company. In addition, the Company may make contributions to the
401(k) Plan at the discretion of the Board of Directors. There were no
discretionary contributions in 1997, 1998 and 1999.

(12) SIGNIFICANT CUSTOMERS

    During the years ended December 31, 1998 and 1999 one customer accounted for
11% and 10%, respectively, of the Company's revenue. The significant customer
was a wholesale distributor of the Company's veterinary products. No customer
accounted for greater than 10% of revenue in 1997.

(13) SEGMENT REPORTING

    The Company adopted the provisions of Statement of Financial Accounting
Standards No. 131 Disclosures about Segments of an Enterprise and Related
Information, (SFAS No. 131) during the fourth quarter of 1998. SFAS No. 131
requires disclosures about operating segments in annual financial statement and
requires selected information about operating segments in interim financial
statements. It also requires related disclosures about products and services and
geographic areas. Operating segments are defined as components of an enterprise
about which separate financial information is available that is evaluated
regularly by the chief operating decision maker, or decision making group, in
deciding how to allocate resources and in assessing performance. The Company's
chief operating decision maker is the chief executive officer.

    The Company is organized into business units by market and customer group.
The Company's reportable operating segments include the Companion Animal Group
("CAG"), the Food and Environmental Division ("FED") and other. The CAG
develops, designs, and distributes products and performs services for
veterinarians. The CAG also manufactures certain biology-based test kits for
veterinarians and develops products for therapeutic applications in companion
animals. FED develops, designs, manufactures and distributes products and
performs services to detect disease and contaminants in food animals, food,
water and food processing facilities. Both the CAG and FED distribute products
and services world-wide. Other is primarily comprised of corporate research and
development, interest income and non-recurring charges.

    The accounting policies of the operating segments are the same as those
described in the summary of significant accounting policies except that
non-recurring charges and most interest income and expense are not allocated to
individual operating segments.



                                       28
<PAGE>   29


Revenues are attributed to geographic areas based on the location of the
customer (in thousands):



<TABLE>
<CAPTION>
                                                  CAG            FED         OTHER           TOTAL
                                              ----------      -------      ---------       ---------

<S>                                           <C>             <C>          <C>             <C>
1999
  Revenue ..............................      $ 278,025       $78,189      $      --       $ 356,214
  Depreciation and Amortization ........         14,289         2,920             --          17,209
  Interest Income (Expense) ............           (151)           --          5,879           5,728
  Provision for Income Taxes ...........         14,182         4,108          1,677          19,967
  Net Income (Loss) ....................         23,140         6,704          2,734          32,578
  Segment Assets .......................        158,833        36,632        164,693         360,158
  Expenditures for Property ............          6,051         2,241             --           8,292

1998
  Revenue ..............................      $ 247,766       $72,123      $      --       $ 319,889
  Depreciation and Amortization ........         13,786         2,101             --          15,887
  Interest Income (Expense) ............            (48)           --          6,925           6,877
  Provision for Income Taxes ...........         10,150         2,017          1,865          14,032
  Net Income (Loss) ....................        (20,335)        3,154          1,966         (15,215)
  Segment Assets .......................        166,390        32,860        187,298         386,548
  Expenditures for Property ............          7,158         1,834             --           8,992

1997
  Revenue ..............................        200,366        62,349            255         262,970
  Depreciation and Amortization ........         12,612         1,807              6          14,425
  Interest Income (Expense) ............           (280)           --          6,950           6,670
  Provision for (Benefit of) Income
   Taxes ...............................         (2,248)        1,566        (10,458)        (11,140)
  Net Income (Loss) ....................         (3,373)        2,349        (20,096)        (21,120)
  Segment Assets .......................        149,806        36,596        186,662         373,064
  Expenditures for Property ............         10,916         1,591             --          12,507
</TABLE>


Revenue by principal geographic areas was as follows (in thousands):

                                                  YEARS ENDED DECEMBER 31,
                                           ------------------------------------
                                             1997          1998          1999
                                           --------      --------      --------

Americas
  United States .......................    $179,353      $229,934      $261,370
  Canada ..............................       9,668         8,719         9,667
  South America .......................       4,189         6,131         6,723

Europe
  United Kingdom ......................      20,088        22,011        23,370
  Germany .............................       9,594         8,737         8,996
  France ..............................       7,869         7,645         8,033
  Other Europe ........................      13,735        16,048        16,245

Asia Pacific Region
  Japan ...............................      10,250        11,271        11,629
  Australia ...........................       4,513         5,800         5,766
  Other Asia
   Pacific ............................       3,711         3,593         4,415
                                           --------      --------      --------

Total .................................    $262,970      $319,889      $356,214
                                           ========      ========      ========






                                       29
<PAGE>   30



    Net property by principal geographic areas was as follows (in thousands):

                                                       DECEMBER 31,
                                            ---------------------------------
                                              1997         1998         1999
                                            -------      -------      -------

Americas
  United States ........................    $69,570      $87,597      $83,065
  Other Americas .......................         13           59          514

Europe
  United Kingdom .......................      1,510        1,402        1,452
  Germany ..............................        321          229          137
  France ...............................        783          614           73
  Netherlands ..........................         73        1,445        1,631
  Other Europe .........................        507          568          519

Asia Pacific Region
  Japan ................................      1,539        1,284        1,178
  Australia ............................      1,650        1,501        1,420
  Other Asia Pacific ...................        645          597          661
                                            -------      -------      -------
Total ..................................    $76,611      $95,296      $90,650
                                            =======      =======      =======


(14) ACCRUED EXPENSES

    Accrued expenses consist of the following (in thousands):

                                                                DECEMBER 31,
                                                           --------------------
                                                             1998         1999
                                                           -------      -------
Accrued compensation and related
  expenses ..........................................      $11,197      $11,094
Accrued income taxes ................................        2,926       10,177
Accrued non-recurring operating
  charge ............................................        3,225          653
Other accrued expenses ..............................       14,698       18,259
                                                           -------      -------
                                                           $32,046      $40,183
                                                           =======      =======

(15)  ACQUISITIONS

(a) Acumedia Manufacturers, Inc.

    On January 30, 1997, the Company acquired all of the capital stock of
Acumedia Manufacturers, Inc. ("Acumedia") for $3.1 million and the issuance of
$1.5 million in notes payable. The Company also agreed to pay an additional
$250,000 based on the results of operations in each of 1997 and 1998. Based on
results for 1997 and 1998, the Company paid $250,000 in both years. The payments
were treated as additional purchase price. Acumedia, located in Baltimore,
Maryland, manufactures and distributes dehydrated culture media for testing in
the food industry. The Company also entered into employment agreements for up to
three years with certain former stockholders. The Company has accounted for this
acquisition under the purchase method of accounting and the Company has included
the results of operations in its consolidated results of operations since the
date of acquisition. Pro forma information has not been presented because of
immateriality. The Company subsequently sold this subsidiary in February 2000.
See Note 16(b).

(b) Veterinary Practice Information Management Software Providers

    The Company's consolidated results of operations include the results of
operations of two veterinary practice information management software businesses
acquired in 1997. These businesses were acquired for an aggregate purchase price
of approximately $19.5 million in cash. The Company paid an additional $500,000
as additional purchase price in February 1998. In connection with these
acquisitions, the Company entered into employment and non-competition agreements
for up to three years with certain former stockholders. The Company has not
presented pro forma financial information because of immateriality. These
acquisitions are as follows:


                                       30
<PAGE>   31

*       On March 13, 1997, the Company acquired all of the capital stock of
        National Information Systems Corporation, located in Eau Claire,
        Wisconsin, which operated under the trade name of Advanced Veterinary
        Systems ("AVS").

*       On July 18, 1997, the Company acquired all of the capital stock of
        Professionals' Software, Inc. ("PSI"), located in Effingham, Illinois.

(c) Wintek Bio-Science Inc.

    On July 1, 1997, the Company, through its wholly-owned subsidiary, IDEXX
Laboratories (Taiwan), Inc., acquired certain assets and assumed certain
liabilities of Wintek Bio-Science Inc. ("Wintek") for $960,000. Wintek, located
in Taipei, Taiwan, distributes diagnostic products to veterinarians and
hospitals in Taiwan. The Company also entered into employment and
non-competition agreements with the owners of Wintek for up to five years. The
Company has accounted for this acquisition under the purchase method of
accounting and the Company has included the results of operations in its
consolidated results of operations since the date of acquisition. Prior to the
acquisition, Wintek distributed the Company's products in Taiwan, however, the
annual sales of products to Wintek were immaterial. Pro forma information has
not been presented because of immateriality.

(d) Agri-West Laboratory

    On March 1, 1998, the Company, through its wholly-owned subsidiary, IDEXX
Food Safety Net Services, Inc. ("IFSNI"), acquired certain assets and assumed
certain liabilities of Agri-West Laboratory ("Agri-West") for $250,000 from
Agri-West International, Inc. ("AWI"). Agri-West, located in Dallas and San
Antonio, Texas, performs food contaminant testing for food processors and
research institutions. The Company also entered into employment, consulting and
non-competition agreements with the owners of AWI for up to five years. The
Company has accounted for this acquisition under the purchase method of
accounting and has included the results of operations in its consolidated
results since the date of acquisition. Pro forma information has not been
presented because of immateriality. The Company subsequently sold the assets of
IFSNI in December 1999. See Note 16(a).

(e) Blue Ridge Pharmaceuticals, Inc.

    On October 1, 1998, the Company acquired all of the capital stock of Blue
Ridge Pharmaceuticals, Inc. for approximately $39.1 million in cash, $7.8
million in notes, 115,000 shares of the Company's Common Stock and warrants to
acquire 806,000 shares of Common Stock at $31.59 per share which expire on
December 31, 2003. In addition, the Company agreed to issue up to 1.24 million
shares of its Common Stock based on the achievement by the Company's
pharmaceutical business (including Blue Ridge) of net sales and operating profit
targets through 2004. All former shareholders received equal value in the form
of cash/notes/stock, warrants and contingent shares on a per share basis. The
notes, which bear interest at 5.5% annually and are due in two equal annual
installments on October 1, 1999 and 2000, are due to certain key employees of
Blue Ridge, subject to certain contingencies. The shares of Common Stock are
issuable on October 1, 2001 to a key employee of Blue Ridge, subject to certain
contingencies. Blue Ridge is a development-stage animal health pharmaceutical
company located in Greensboro, North Carolina. The Company has accounted for
this acquisition under the purchase method of accounting and has included the
results of operations in its consolidated results since the date of acquisition.
The Company will record the issuance of any of the 1.24 million shares discussed
above as additional goodwill when the shares are issued. Pro forma results of
the Company, assuming the acquisition had been made as of January 1, 1997 are as
follows. Such information includes adjustments to reflect additional interest
expense and loss of investment income, both net of tax and goodwill amortization
(in thousands except per share data and unaudited):

                                                  YEARS ENDED
                                                  DECEMBER 31,
                                         -----------------------------
                                             1997              1998
                                         -----------       -----------
Revenue ...............................  $   262,970       $   321,441
Net income (loss) .....................      (25,765)           16,735
Earnings (loss) per share: Basic ......         (.68)              .43
Earnings (loss) per share: Diluted ....         (.68)              .42


    For purposes of these pro forma operating results, the in-process research
and development was assumed to have been written off on December 31, 1996. Pro
forma operating results presented include only recurring costs resulting from
the acquisition of Blue Ridge.


                                       31
<PAGE>   32


(f) Veterinary Reference Laboratories

    The Company's 1997, 1998 and 1999 consolidated results of operations also
include the results of operations of a veterinary reference laboratory business
acquired in 1997 for aggregate purchase price of approximately $844,000 in cash,
the issuance of $587,000 in unsecured notes payable, plus the assumption of
certain liabilities.

    The Company's 1999 consolidated results of operations include the results of
operations of two veterinary reference laboratory businesses acquired in 1999
for an aggregate purchase price of $4.1 million, the issuance of $539,000 in
unsecured notes payable, plus the assumption of certain liabilities.

    In connection with these acquisitions, the company entered into
non-competition agreements with the sellers for up to ten years. The Company has
accounted for these acquisitions under the purchase method of accounting. The
results of operations of each of these businesses has been included in the
Company's consolidated results of operations since each of their respective
dates of acquisition. The Company has not presented pro forma information
because of immateriality. These acquisitions are as follows:

*       On December 1997, the Company, through its wholly-owned subsidiary IDEXX
        Laboratories Pty. Ltd., acquired certain assets and assumed certain
        liabilities of Lording & Friend Pty. Ltd. and Clinpath Pty. Ltd.
        (operating under the name Central Veterinary Diagnostic Laboratory),
        which operated a veterinary reference laboratory in Australia.

*       On March 31, 1999, the Company acquired the assets and assumed certain
        liabilities of the veterinary laboratory business of Sonora Quest
        Laboratories, LLC (Sonora) which operated a veterinary laboratory in
        Arizona.

*       On December 1, 1999, the Company acquired the assets and certain
        liabilities of the veterinary laboratory business of the Tufts
        University School of Veterinary Medicine which operated a veterinary
        laboratory in Massachusetts.

(16) DIVESTITURES

    Through a series of transactions in December 1999 and February 2000 the
Company sold certain assets and subsidiaries of its Food and Environmental
Division. As a result of these transactions, the Company recorded a loss of
approximately $400,000 in 1999 and anticipates that it will record an immaterial
gain in 2000. The results of operations of these businesses have been included
in the consolidated results of operations through the respective sale dates. Pro
forma information has not been presented because of immateriality.

(a) IDEXX Food Safety Net Services, Inc.

    On December 21, 1999, the Company sold substantially all the assets and the
business of IDEXX Food Safety Net Services, Inc. to Food Safety Net Services
Ltd. for $350,000 in cash, $195,000 note payable and the assumption of certain
liabilities. The note bears interest at 6% and is due in twelve quarterly
installments. In addition, the Company entered into a non-compete agreement for
five years.

(b) Food Products and Acumedia Manufacturers, Inc.

    During February 2000, the Company sold certain assets and the rights to its
Lightning, Simplate and Bind product lines and its subsidiary Acumedia
Manufacturers, Inc. ("Acumedia") for $10.4 million in cash, $450,000 note
payable, and the assumption of certain liabilities. The Company will also
receive up to an additional $1.0 million based on revenue of the Acumedia
business between the sale date and February 16, 2001. The note bears interest at
7% and is due on February 16, 2001. In addition, the Company entered into
non-compete agreements for up to five years.



                                       32
<PAGE>   33



(17) SERVICE REVENUE

    Service revenue, which includes laboratory service revenue and maintenance
and repair revenue, totaled approximately $46.6 million, $62.5 million and $72.6
million in 1997, 1998 and 1999, respectively. The cost of service revenue in
1997, 1998 and 1999 totaled approximately $28.4 million, $45.6 million and $58.8
million, respectively.

(18) STOCK REPURCHASE PROGRAM

    During 1999, the Board of Directors authorized the purchase of up to six
million shares of the Company's Common Stock in the open market or in negotiated
transactions. As of December 31, 1999, approximately 3.9 million shares of
Common Stock were repurchased under this program.

(19)  INFORMATION REGARDING CLASSES OF SIMILAR PRODUCTS OR SERVICES (UNAUDITED)


    Approximately 71%, 70% and 69% of the Company's revenues were derived from
the sale of veterinary diagnostic products and services in 1997, 1998 and 1999,
respectively. Approximately 24%, 23% and 22% of revenues were derived from sales
of food and environmental products and services in 1997, 1998, and 1999,
respectively.


(20) SUMMARY OF QUARTERLY DATA (UNAUDITED)

   A summary of quarterly data follows (in thousands, except per share data):


                                              1998 QUARTER ENDED
                               -------------------------------------------------
                               MARCH 31     JUNE 30    SEPTEMBER 30  DECEMBER 31
                               --------     -------    ------------  -----------
Revenue ....................   $77,793      $80,886      $78,487      $ 82,723
Gross profit ...............    38,039       40,100       39,067        40,985
Operating profit (loss) ....     4,590        6,641        7,863       (27,154)
Net income (loss) ..........     3,761        5,098        5,996       (30,070)
Earnings (loss) per share:
  Basic ....................      0.10         0.13         0.16         (0.78)
  Diluted ..................      0.10         0.13         0.15         (0.78)

                                              1999 QUARTER ENDED
                               -------------------------------------------------
                               MARCH 31     JUNE 30    SEPTEMBER 30  DECEMBER 31
                               --------     -------    ------------  -----------
Revenue ....................   $89,648      $91,524      $86,422      $ 88,620
Gross profit ...............    44,874       44,614       41,487        43,122
Operating income ...........    10,433       11,610       11,951        12,823
Net income .................     7,281        8,025        8,428         8,844
Earnings per share:
 Basic .....................      0.19         0.20         0.22          0.24
 Diluted ...................      0.18         0.20         0.21          0.24





                                       33
<PAGE>   34





                                                                     SCHEDULE II

                    IDEXX LABORATORIES, INC. AND SUBSIDIARIES

                        VALUATION AND QUALIFYING ACCOUNTS
                                 (IN THOUSANDS)


<TABLE>
<CAPTION>
                                            BALANCE AT    CHARGED TO               BALANCE
                                             BEGINNING     COSTS AND               AT END
                                              OF YEAR      EXPENSES   WRITE-OFFS   OF YEAR
                                            ----------    ----------  ----------   -------
<S>                                          <C>          <C>          <C>         <C>
Allowance for doubtful accounts:
 December 31, 1997 ....................      $ 4,001      $ 2,246      $1,165      $ 5,082
 December 31, 1998 ....................        5,082        1,357       1,071        5,368
 December 31, 1999 ....................        5,368          270         810        4,828

Accrued non-recurring operating charge:
 December 31, 1997 ....................           --       21,300       9,360       11,940
 December 31, 1998 ....................       11,940           --       8,715        3,225
 December 31, 1999 ....................        3,225           --       2,572          653
</TABLE>




                                       34
<PAGE>   35


    MARKET FOR THE REGISTRANT'S COMMON STOCK AND RELATED STOCKHOLDER MATTERS

    The Common Stock is quoted on the Nasdaq National Market under the symbol
IDXX. The following table sets forth for the periods indicated the high and low
closing sale prices per share of the Common Stock as reported on the Nasdaq
National Market.

                                        HIGH            LOW
                                    ----------       ---------
CALENDAR 1998
   First Quarter .............      $ 18  7/8        $ 12  7/8
   Second Quarter ............        25  5/16         17  5/8
   Third Quarter .............        24 15/16         17  1/2
   Fourth Quarter ............        27 13/16         18  1/4

CALENDAR 1999
   First Quarter .............      $ 27 11/16       $ 19  3/4
   Second Quarter ............        27  7/8          19  5/16
   Third Quarter .............        22  7/16         15
   Fourth Quarter ............        19  5/8          14 11/16


    As of December 31, 1999, there were 1,687 holders of record of the Company's
Common Stock.

    The Company has never paid any cash dividends on its Common Stock and does
not anticipate paying any cash dividends in the foreseeable future. The Company
currently intends to retain future earnings to fund the development and growth
of its business.




                                       35



<PAGE>   1






                                                                      EXHIBIT 21

                           SUBSIDIARIES OF THE COMPANY

            NAME                                  JURISDICTION OF INCORPORATION
- -----------------------------                     -----------------------------

Acumedia Manufacturers, Inc.                      Maryland
Blue Ridge Pharmaceuticals, Inc.                  Delaware
Cardiopet Incorporated                            Delaware
IDEXX Distribution Corporation                    Delaware
IDEXX Europe B.V.                                 The Netherlands
IDEXX Food Safety Net Services, Inc.              Delaware
IDEXX GmbH                                        Germany
IDEXX Informatics, Inc.                           Delaware
IDEXX Laboratories B.V.                           The Netherlands
IDEXX Laboratories Canada Corporation             Canada
IDEXX Laboratories Foreign Sales Corporation      U.S. Virgin Islands
IDEXX Laboratories Italia S.r.l.                  Italy
IDEXX Laboratories, KK                            Japan
IDEXX Laboratories, Limited                       England and Wales
IDEXX Laboratories (NZ) Limited                   New Zealand
IDEXX Laboratories Pty. Ltd.                      Australia
IDEXX Laboratories, S. de R.L. de C.V.            Mexico
IDEXX Laboratories, S.L.                          Spain
IDEXX Laboratories (Taiwan) Inc.                  Taiwan R.O.C.
IDEXX Logistique et Scientifique Europe S.A.      France
IDEXX Management Services Europe S.A.             France
IDEXX S.A.R.L.                                    France
IDEXX Scandinavia A.B.                            Sweden
IDEXX Service, S.A. de C.V.                       Mexico
IDEXX Veterinary Services, Inc.                   Delaware
VetConnect, Inc.                                  Delaware
TD Acquisition Corp.                              Delaware



                                       36

<PAGE>   1



                                                                    Exhibit 23.1

                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

As independent public accountants, we hereby consent to the incorporation of our
report, included in this Form 10-K, into the Company's previously filed
Registration Statement File Nos. 33-41806, 33-42845, 33-42846, 33-48404,
33-61494, 33-64202, 33-64204, 33-95616, 333-11201, 333-11199, 333-36009,
333-36007, 333-56685, 333-78765 and 333-78769.

                                                         /s/ Arthur Andersen LLP

Boston, Massachusetts
March  23, 2000








                                       37



<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE IDEXX
LABORATORIES, INC. CONSOLIDATED FINANCIAL STATEMENTS AS OF AND FOR THE 12 MONTHS
ENDED DECEMBER 31, 1999 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000874716
<NAME> IDEXX LABORATORIES, INC.
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS

<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<EXCHANGE-RATE>                                      1
<CASH>                                          58,576
<SECURITIES>                                    46,835
<RECEIVABLES>                                   63,181
<ALLOWANCES>                                     4,828
<INVENTORY>                                     47,488
<CURRENT-ASSETS>                               232,415
<PP&E>                                          88,658
<DEPRECIATION>                                  49,108
<TOTAL-ASSETS>                                 360,158
<CURRENT-LIABILITIES>                           75,524
<BONDS>                                            293
                                0
                                          0
<COMMON>                                         3,958
<OTHER-SE>                                     280,383
<TOTAL-LIABILITY-AND-EQUITY>                   360,158
<SALES>                                        283,573
<TOTAL-REVENUES>                               356,214
<CGS>                                          123,364
<TOTAL-COSTS>                                  182,117
<OTHER-EXPENSES>                               127,010
<LOSS-PROVISION>                                   270
<INTEREST-EXPENSE>                                 476
<INCOME-PRETAX>                                 52,545
<INCOME-TAX>                                    19,967
<INCOME-CONTINUING>                             32,578
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    32,578
<EPS-BASIC>                                       0.85
<EPS-DILUTED>                                     0.82


</TABLE>


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