: Most pet owners buy directly from their vet during their annual checkup. This is often the most convenient way to ensure you get the correct dosage immediately.

: Retailers like Petco and PetSmart have online and in-store pharmacy services that can fulfill prescriptions. Why a Prescription is Required

: Reputable sites like 1-800-PetMeds , Chewy, and Allivet offer competitive pricing on brands like Heartgard and Interceptor. You will need to provide your vet's information so the pharmacy can verify the prescription.