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According to reviewers from The Spruce Pets , the following are top-rated for reliability and service:

Legitimate sites like Chewy or PetMeds will ask for your vet's contact information to confirm the script or require you to mail it in. 3. Trusted Online Retailers buy heartworm prevention online

A veterinarian must confirm your pet's current heartworm status via a blood test before starting or renewing a prescription. According to reviewers from The Spruce Pets ,