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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2020-09-09</periodOfReport>

    <dateOfOriginalSubmission>2020-09-11</dateOfOriginalSubmission>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001752836</issuerCik>
        <issuerName>COVETRUS, INC.</issuerName>
        <issuerTradingSymbol>CVET</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001624514</rptOwnerCik>
            <rptOwnerName>CD&amp;R Investment Associates IX, Ltd.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O M+C CORPORATE SERVICES LIMITED</rptOwnerStreet1>
            <rptOwnerStreet2>P.O. BOX 309 UGLAND HSE, SOUTH CHURCH ST</rptOwnerStreet2>
            <rptOwnerCity>GEORGE TOWN</rptOwnerCity>
            <rptOwnerState>E9</rptOwnerState>
            <rptOwnerZipCode>KY1-1104</rptOwnerZipCode>
            <rptOwnerStateDescription>CAYMAN ISLANDS</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001766983</rptOwnerCik>
            <rptOwnerName>CD&amp;R VFC Holdings L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O M+C CORPORATE SERVICES LIMITED</rptOwnerStreet1>
            <rptOwnerStreet2>P.O. BOX 309 UGLAND HSE, SOUTH CHURCH ST</rptOwnerStreet2>
            <rptOwnerCity>GEORGE TOWN</rptOwnerCity>
            <rptOwnerState>E9</rptOwnerState>
            <rptOwnerZipCode>KY1-1104</rptOwnerZipCode>
            <rptOwnerStateDescription>CAYMAN ISLANDS</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2020-09-09</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>14357478</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>25423956</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By affiliate</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">On September 9, 2020, 159,368 shares of 7.5% Series A Preferred Stock (the &quot;Preferred Stock&quot;) of Covetrus, Inc. (the &quot;Issuer&quot;) were converted into 14,357,477 shares of common stock of the Issuer (the &quot;Common Stock&quot;) at the option of the Issuer, pursuant to the terms of the certificate of designations, preferences and right governing the Preferred Stock.</footnote>
        <footnote id="F2">These securities are owned directly by CD&amp;R VFC Holdings, L.P. (&quot;CD&amp;R Stockholder&quot;). CD&amp;R Investment Associates IX, Ltd., as the general partner of CD&amp;R Stockholder, may be deemed to beneficially own the shares of Common Stock and Preferred Stock held by CD&amp;R Stockholder. CD&amp;R Investment Associates IX, Ltd. expressly disclaims beneficial ownership of the shares of Common Stock and Preferred Stock held by CD&amp;R Stockholder, except to the extent of its pecuniary interest therein.</footnote>
    </footnotes>

    <remarks>This Form 4 Amendment is being filed to correct the transaction code which was inadvertently misstated on the Form 4 file on September 11, 2020.</remarks>

    <ownerSignature>
        <signatureName>CD&amp;R Investment Associates IX, Ltd., By: Theresa A. Gore, CFO, Treas. and Sec.</signatureName>
        <signatureDate>2020-11-20</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>CD&amp;R VFC Holdings, L.P., By: CD&amp;R Investment Associates IX, Ltd, general partner; By: /s/ Theresa A. Gore, CFO, Treas. and Sec.</signatureName>
        <signatureDate>2020-11-20</signatureDate>
    </ownerSignature>
</ownershipDocument>
