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Visit your vet for an annual blood test.

Avoid sites that claim "no prescription required" for U.S. customers. Buying from unverified sources carries significant risks: How to Avoid the Disasters of Counterfeit Pet Prescriptions buy heartworm prevention online

Look for pharmacies that are LegitScript or Vet-VIPPS (Veterinary-Verified Internet Pharmacy Practice Sites) accredited. Visit your vet for an annual blood test

You have the legal right to ask your vet for a written prescription to fill elsewhere. buy heartworm prevention online

A veterinarian must confirm your pet's current heartworm status via a blood test before starting or renewing a prescription.