<?xml version="1.0"?>
<ownershipDocument>
    <schemaVersion>X0101</schemaVersion>

    <documentType>3</documentType><periodOfReport>2003-06-09</periodOfReport>
    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001084103</issuerCik>
        <issuerName>NETWOLVES CORP</issuerName>
        <issuerTradingSymbol>WOLV</issuerTradingSymbol></issuer><reportingOwner><reportingOwnerId>
            <rptOwnerCik>0001246439</rptOwnerCik>
            <rptOwnerName>LUTTINGER LEONARD M</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>Vice President</officerTitle></reportingOwnerRelationship></reportingOwner><derivativeSecurity><securityTitle><value>2002 Stock Option Plan</value></securityTitle><conversionOrExercisePrice><value>1</value></conversionOrExercisePrice><exerciseDate><value>2005-12-20</value><footnoteId id="F1"/></exerciseDate><expirationDate><value>2007-12-19</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>75000</value></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value></value></natureOfOwnership></ownershipNature></derivativeSecurity><derivativeSecurity><securityTitle><value>2000 Stock Option Plan</value></securityTitle><conversionOrExercisePrice><value>6</value></conversionOrExercisePrice><exerciseDate><value>2003-11-20</value><footnoteId id="F2"/></exerciseDate><expirationDate><value>2005-11-19</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>160000</value></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value></value></natureOfOwnership></ownershipNature></derivativeSecurity><footnotes><footnote id="F1">Options to purchase vest one-third one year from issuance, December 20, 2002, one-third two years later and one-third three years later.</footnote><footnote id="F2">Options to purchase vest one-third one year from issuance, November 20, 2000, one-third two years later and one-third three years later.</footnote></footnotes><ownerSignature><signatureName>Leonard M. Luttinger</signatureName><signatureDate>2003-06-26</signatureDate></ownerSignature></ownershipDocument>

