<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2017-07-20</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001668673</issuerCik>
        <issuerName>PetIQ, Inc.</issuerName>
        <issuerTradingSymbol>PETQ</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001256578</rptOwnerCik>
            <rptOwnerName>FIRST MARK L</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>320 PARK AVENUE, 9TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>5311523</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F1"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Includes 4,470,531 shares of Class A Common Stock held by Eos Capital Partners IV, L.P. and 840,992 shares of Class A Common Stock held by Eos Partners, L.P., which are affiliates (collectively the &quot;Eos Funds&quot;).  Mr. First has investment and voting control over and may be considered the beneficial owner of stock owned by the Eos Funds.  Mr. First disclaims beneficial ownership of such securities, and this report shall not be deemed an admission that Mr. First is the beneficial owner of the securities for purposes of Section 16 or for any other purpose, except to the extent of his pecuniary interest therein.</footnote>
    </footnotes>

    <remarks>See Exhibit 24.1 - Power of Attorney.</remarks>

    <ownerSignature>
        <signatureName>/s/ Robert Mooney, by power of attorney</signatureName>
        <signatureDate>2017-07-20</signatureDate>
    </ownerSignature>
</ownershipDocument>
