: Pets under 6–7 months old can often start prevention without a test because it takes about six months for adult worms to develop.
Buying heartworm medicine for your pet is a multi-step process that requires a veterinarian's involvement due to safety and legal regulations. In the U.S., the FDA regulates these medications as to ensure proper dosage and safety. Step 1: Get a Heartworm Test
: Giving preventative medication to an already-infected pet can cause a sudden, massive die-off of larvae, which may lead to a fatal shock-like reaction.
Your vet will recommend a specific product based on your pet’s weight, age, and health history.