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

Visit your vet for an annual blood test. buy heartworm prevention online

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 A veterinarian must confirm your pet's current heartworm

You cannot legally buy legitimate heartworm prevention in the U.S. without a vet’s authorization. This regulation exists because: buy heartworm prevention online

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

Look for pharmacies that are LegitScript or Vet-VIPPS (Veterinary-Verified Internet Pharmacy Practice Sites) accredited.