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    <element id="PETV_CorrectionofErrorinPreviouslyIssuedWarrantsAndRightsOutstanding" name="CorrectionofErrorinPreviouslyIssuedWarrantsAndRightsOutstanding" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_CorrectionofErrorinPreviouslyIssuedRetainedEarningsAccumulatedDeficit" name="CorrectionofErrorinPreviouslyIssuedRetainedEarningsAccumulatedDeficit" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_CorrectionofErrorinPreviouslyIssuedStockholdersEquity" name="CorrectionofErrorinPreviouslyIssuedStockholdersEquity" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_PercentageOfNetRevenue" name="PercentageOfNetRevenue" nillable="true" xbrli:periodType="duration" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_EmployeeStockOwnershipOfDirectorsCompensation" name="EmployeeStockOwnershipOfDirectorsCompensation" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_EmployeeStockOwnershipOfWarrantExpense" name="EmployeeStockOwnershipOfWarrantExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_CorrectionEliminated" name="CorrectionEliminated" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_PrepaidInvestorRelationExpense" name="PrepaidInvestorRelationExpense" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_PrepaidSoftwareSubscriptionFees" name="PrepaidSoftwareSubscriptionFees" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_PrepaidExpenseTradeShow" name="PrepaidExpenseTradeShow" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_LicensingAgreementAccumulatedImpairment" name="LicensingAgreementAccumulatedImpairment" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_LicensingAgreementContractPayable" name="LicensingAgreementContractPayable" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_LicensingAgreementAccumulatedAmortization" name="LicensingAgreementAccumulatedAmortization" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_LicensingAgreementNet" name="LicensingAgreementNet" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_LicensingAgreementTerm" name="LicensingAgreementTerm" nillable="true" xbrli:periodType="duration" type="xbrli:durationItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_LicensingFee" name="LicensingFee" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_ContractPayable" name="ContractPayable" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_RoyaltyFeePaymentPercentage" name="RoyaltyFeePaymentPercentage" nillable="true" xbrli:periodType="duration" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_ImpairmentExpense" name="ImpairmentExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_LicensingAgreementContractLiability" name="LicensingAgreementContractLiability" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_StockIssuedDuringPeriodSharesCommonStockIssuedForLicensingAgreement" name="StockIssuedDuringPeriodSharesCommonStockIssuedForLicensingAgreement" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_StockIssuedDuringPeriodValueCommonStockIssuedForLicensingAgreement" name="StockIssuedDuringPeriodValueCommonStockIssuedForLicensingAgreement" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_AccruedExpensesCurrent" name="AccruedExpensesCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_FairValueOfDerivativeReclassifiedToEquity" name="FairValueOfDerivativeReclassifiedToEquity" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_UnrealizedGainLossOnDerivative" name="UnrealizedGainLossOnDerivative" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_FairValueImmediatelyPriorToConversion" name="FairValueImmediatelyPriorToConversion" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_DerivativeLiabilitiesExtinguishedUponConversion" name="DerivativeLiabilitiesExtinguishedUponConversion" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_AmortizationOfDebtDiscount" name="AmortizationOfDebtDiscount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearThree" name="LesseeOperatingLeaseLiabilityPaymentsDueAfterYearThree" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_OperatingLeaseLiabilityGross" name="OperatingLeaseLiabilityGross" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_BaseRentPaymentsIncludedInPrepaidExpenses" name="BaseRentPaymentsIncludedInPrepaidExpenses" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_OperatingLeaseLiabilities" name="OperatingLeaseLiabilities" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_OperatingLeaseRightofuseCurrentAsset" name="OperatingLeaseRightofuseCurrentAsset" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_PercentageOfIncreaseInRent" name="PercentageOfIncreaseInRent" nillable="true" xbrli:periodType="duration" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_AdditionalGainLossOnTerminationOfLease" name="AdditionalGainLossOnTerminationOfLease" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice" nillable="true" xbrli:periodType="instant" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_SharebasedCompensationArrangementBySharebasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageRemainingContractualTerm" name="SharebasedCompensationArrangementBySharebasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageRemainingContractualTerm" nillable="true" xbrli:periodType="duration" type="xbrli:durationItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableWeightedAverageExercisePrice" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableWeightedAverageExercisePrice" nillable="true" xbrli:periodType="instant" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantedInPeriodWeightedAverageExercisePrice" name="ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantedInPeriodWeightedAverageExercisePrice" nillable="true" xbrli:periodType="duration" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_SharebasedCompensationArrangementBySharebasedPaymentAwardNonOptionEquityInstrumentsGrantedAndIssuedWeightedAverageRemainingContractualTerm" name="SharebasedCompensationArrangementBySharebasedPaymentAwardNonOptionEquityInstrumentsGrantedAndIssuedWeightedAverageRemainingContractualTerm" nillable="true" xbrli:periodType="duration" type="xbrli:durationItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantedAndIssuedWeightedAverageExercisablePrice" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantedAndIssuedWeightedAverageExercisablePrice" nillable="true" xbrli:periodType="duration" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisedInPeriodWeightedAverageExercisePrice" name="ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisedInPeriodWeightedAverageExercisePrice" nillable="true" xbrli:periodType="duration" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionEquityInstrumentsExpirationsInPeriodWeightedAverageExercisePrice" name="ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionEquityInstrumentsExpirationsInPeriodWeightedAverageExercisePrice" nillable="true" xbrli:periodType="duration" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_ProceedsFromSubscriptionReceivable" name="ProceedsFromSubscriptionReceivable" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_StockIssuedDuringPeriodSharesConversionOfAccruedDividends" name="StockIssuedDuringPeriodSharesConversionOfAccruedDividends" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_StockIssuedDuringPeriodValueConversionOfAccruedDividends" name="StockIssuedDuringPeriodValueConversionOfAccruedDividends" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_AmortizationOfStockIssuedForServices" name="AmortizationOfStockIssuedForServices" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_UnrecognizedWarrantExpense" name="UnrecognizedWarrantExpense" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_InvestmentsInEquitySecuritiesAbstract" name="InvestmentsInEquitySecuritiesAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_InvestmentsInEquitySecuritiesTable" name="InvestmentsInEquitySecuritiesTable" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" />
    <element id="PETV_GrantEconomicBenefits" name="GrantEconomicBenefits" nillable="true" xbrli:periodType="duration" type="xbrli:integerItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_WarrantsToPurchaseCommonStockMember" name="WarrantsToPurchaseCommonStockMember" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_CommonStockParValue0.001Member" name="CommonStockParValue0.001Member" nillable="true" xbrli:periodType="duration" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_StockIssuedDuringPeriodValueCommonStockToBeIssued" name="StockIssuedDuringPeriodValueCommonStockToBeIssued" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_LossOnSaleOfLeaseVehicles" name="LossOnSaleOfLeaseVehicles" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
</schema>
