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    <element id="PETV_IndefiniteNetOperatingLoss" name="IndefiniteNetOperatingLoss" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_IncomeTaxReconciliationExpenseOther" name="IncomeTaxReconciliationExpenseOther" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="PETV_EffectiveIncomeTaxRateReconciliationExpenseOther" name="EffectiveIncomeTaxRateReconciliationExpenseOther" nillable="true" xbrli:periodType="duration" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
</schema>
