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| | <link:loc xlink:href="pets-20191231.xsd#pets_EmployeeAndDirectorPlansMember" xlink:label="pets_EmployeeAndDirectorPlansMember" xlink:type="locator"/> |
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| | <link:loc xlink:href="pets-20191231.xsd#pets_TwoThousandAndSixOutsideDirectorEquityCompensationRestrictedStockPlanTheDirectorPlanMember" xlink:label="pets_TwoThousandAndSixOutsideDirectorEquityCompensationRestrictedStockPlanTheDirectorPlanMember" xlink:type="locator"/> |
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| | <link:definitionArc order="1" xbrldt:closed="true" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain-default" xlink:type="arc"/> |
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| | <link:loc xlink:href="pets-20191231.xsd#pets_EmployeeAndDirectorPlansMember" xlink:label="pets_EmployeeAndDirectorPlansMember" xlink:type="locator"/> |
| | <link:loc xlink:href="pets-20191231.xsd#pets_EmployeeEquityCompensationRestrictedStockPlan2016Member" xlink:label="pets_EmployeeEquityCompensationRestrictedStockPlan2016Member" xlink:type="locator"/> |
| | <link:loc xlink:href="pets-20191231.xsd#pets_EmployeeEquityCompensationRestrictedStockPlanTheEmployeePlanMember" xlink:label="pets_EmployeeEquityCompensationRestrictedStockPlanTheEmployeePlanMember" xlink:type="locator"/> |
| | <link:loc xlink:href="pets-20191231.xsd#pets_OutsideDirectorEquityCompensationRestrictedStockPlan2015DirectorPlanMember" xlink:label="pets_OutsideDirectorEquityCompensationRestrictedStockPlan2015DirectorPlanMember" xlink:type="locator"/> |
| | <link:loc xlink:href="pets-20191231.xsd#pets_TwoThousandAndSixOutsideDirectorEquityCompensationRestrictedStockPlanTheDirectorPlanMember" xlink:label="pets_TwoThousandAndSixOutsideDirectorEquityCompensationRestrictedStockPlanTheDirectorPlanMember" xlink:type="locator"/> |
| | <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="us-gaap_AllocatedShareBasedCompensationExpense" xlink:type="locator"/> |
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| | <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:type="locator"/> |
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| | <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="us-gaap_PlanNameAxis" xlink:type="locator"/> |
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| | <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:type="locator"/> |
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| | <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross" xlink:label="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross" xlink:type="locator"/> |
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