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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 T5/ttwR6M3znj8/6kPE354HrDNlTtPC1r6fL8T8P7VJbsDKVMAht3VMBrxSZxqQv
 XpuEWSvLbWBoeWaAWMRZog==

<SEC-DOCUMENT>0001193556-03-000011.txt : 20030527
<SEC-HEADER>0001193556-03-000011.hdr.sgml : 20030526
<ACCEPTANCE-DATETIME>20030527120055
ACCESSION NUMBER:		0001193556-03-000011
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030523
FILED AS OF DATE:		20030527

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			NAPOLITANO JASON A
		CENTRAL INDEX KEY:			0001206318

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	333-72155
		FILM NUMBER:		03719395

	MAIL ADDRESS:	
		STREET 1:		1613 PROSPECT PARKWAY
		CITY:			FORT COLLINS
		STATE:			CO
		ZIP:			80525

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			HESKA CORP
		CENTRAL INDEX KEY:			0001038133
		STANDARD INDUSTRIAL CLASSIFICATION:	BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
		IRS NUMBER:				770192527
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		1613 PROSPECT PARKWAY
		CITY:			FORT COLLINS
		STATE:			CO
		ZIP:			80525
		BUSINESS PHONE:		9704937272

	MAIL ADDRESS:	
		STREET 1:		1613 PROSPECT PARKWAY
		CITY:			FORT COLLINS
		STATE:			CO
		ZIP:			80525
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgardoc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0101</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2003-05-23</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001038133</issuerCik>
        <issuerName>HESKA CORP</issuerName>
        <issuerTradingSymbol>HSKA</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001206318</rptOwnerCik>
            <rptOwnerName>NAPOLITANO JASON A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>  </rptOwnerStreet1>
            <rptOwnerStreet2>  </rptOwnerStreet2>
            <rptOwnerCity>  </rptOwnerCity>
            <rptOwnerState>  </rptOwnerState>
            <rptOwnerZipCode>  </rptOwnerZipCode>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Exec Vice President, Chief</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeSecurity>
        <securityTitle>
            <value>Common Stock</value>
        </securityTitle>
        <transactionDate>
            <value>2003-05-23</value>
        </transactionDate>
        <transactionCoding>
            <transactionFormType>4</transactionFormType>
            <transactionCode>P</transactionCode>
            <equitySwapInvolved>0</equitySwapInvolved>
        </transactionCoding>
        <transactionAmounts>
            <transactionShares>
                <value>1900</value>
            </transactionShares>
            <transactionValue>
                <value>1.37</value>
            </transactionValue>
            <transactionAcquiredDisposedCode>
                <value>A</value>
            </transactionAcquiredDisposedCode>
        </transactionAmounts>
        <postTransactionAmounts>
            <sharesOwnedFollowingTransaction>
                <value>291100</value>
            </sharesOwnedFollowingTransaction>
        </postTransactionAmounts>
        <ownershipNature>
            <directOrIndirectOwnership>
                <value>D</value>
            </directOrIndirectOwnership>
        </ownershipNature>
    </nonDerivativeSecurity>

    <ownerSignature>
        <signatureName>Jason A. Napolitano</signatureName>
        <signatureDate>2003-05-23</signatureDate>
    </ownerSignature>

</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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