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Giving preventative to a dog that already has adult heartworms can cause a severe, potentially fatal reaction as the larvae die off.

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

Visit your vet for an annual blood test. Giving preventative to a dog that already has

Vets ensure the product and dose are correct based on your pet’s exact weight and health history. 2. How to Buy Online Legally To purchase safely, follow these steps: This regulation exists because: Visit your vet for

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 status via a blood test before starting or renewing a prescription.