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: The FDA classifies all heartworm preventatives as prescription-only drugs.

: Even for dogs on year-round prevention, annual testing is recommended to ensure the product is working and that no doses were missed or spit out. Where to Purchase Heartworm in Dogs buying heartworm medication for dogs

: Dogs must test negative before starting or renewing a prescription, as giving medication to an infected dog can cause severe, life-threatening reactions. : The FDA classifies all heartworm preventatives as

Heartworm prevention is a lifelong commitment that requires a veterinarian's prescription and regular testing. While online pharmacies offer convenience, purchasing through your vet ensures product safety and often includes manufacturer guarantees that internet retailers cannot provide. Buying Requirements buying heartworm medication for dogs