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<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20031024
<FILING-DATE>20031027
<REPORTING-OWNER>
<OWNER-DATA>
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<CITY>WESTBROOK
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<CONFORMED-NAME>IDEXX LABORATORIES INC /DE
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<STATE-OF-INCORPORATION>DE
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<FORMER-COMPANY>
<FORMER-CONFORMED-NAME>IDEXX CORP / DE
<DATE-CHANGED>19600201
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<DOCUMENT>
<TYPE>4
<SEQUENCE>1
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    <footnotes>
        <footnote id="F1">Reporting person also indirectly holds 5,046 shares of Common Stock of IDEXX Laboratories, Inc., which shares are held by the Andrew Q. Tonelli UTMA and Bret C. Tonelli UTMA. Reporting person disclaims beneficial ownership of these shares and this report should not be deemed an admission that the reporting person is the beneficial owner of such shares for purposes of Section 16 or any other purpose.</footnote>
        <footnote id="F2">Grant of option to buy shares of Common Stock exercisable in annual increments of 40 shares on the first anniversay of the date of grant (12/15/93).</footnote>
        <footnote id="F3">Grant of option to buy shares of Common Stock exercisable as to 664 shares on 2/22/95 and 2/22/96; 1,298 shares on 2/22/97 and 1,600 shares on 2/22/98 and 2/22/99.</footnote>
        <footnote id="F4">Grant of option to buy shares of Common Stock exercisable as to 1 share on 2/13/97 and 1,050 shares on 2/13/99, 2/13/00 and 2/13/01.</footnote>
        <footnote id="F5">Grant of option to buy shares of Common Stock exercisable as to 750 shares on 2/04/99, 2/04/00, 2/04/01 and 2/04/02.</footnote>
        <footnote id="F6">Grant of option to buy shares of Common Stock exercisable as to 710 shares on 2/08/98 and 2,000 shares on 2/08/99 and 2/08/00.</footnote>
        <footnote id="F7">Grant of option to buy shares of Common Stock exercisable as to 100 shares on 5/26/99 and 5/26/00.</footnote>
    </footnotes>


    <ownerSignature>
        <signatureName>Conan R. Deady, Attorney-in-Fact for Quentin J. Tonelli</signatureName>
        <signatureDate>2003-10-27</signatureDate>
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