Question 1

How much does a dog heartworm test cost?

Accepted Answer

A dog heartworm test costs $25 to $50, with an average of $35. A 4DX test (heartworm + 3 tick diseases) costs $35–$60. The test is required annually even if your dog is on year-round heartworm prevention. It's typically done during the annual wellness exam and results are available in 10 minutes.

Question 2

Does pet insurance cover heartworm testing?

Accepted Answer

Standard pet insurance typically doesn't cover routine heartworm testing — it's considered preventive care. Wellness add-on plans may cover the test ($25–$60 reimbursement). If your dog tests positive and needs treatment, the treatment ($600–$6,000) is covered under illness coverage.

Question 3

Does my dog need a heartworm test if they're on prevention year-round?

Accepted Answer

Yes. Annual heartworm testing is required even for dogs on year-round prevention. No preventive is 100% effective — a dog can become infected if a dose is missed, vomited, or if the preventive fails. Early detection allows for easier, cheaper, and safer treatment. The American Heartworm Society recommends annual testing for all dogs.

Question 4

What happens if my dog tests positive for heartworms?

Accepted Answer

If your dog tests positive, the vet will confirm with a second test (microfilariae or PCR test, $25–$150). Once confirmed, treatment begins — a series of injections (melarsomine) over 3–6 months, costing $600–$6,000. Your dog must be strictly exercise-restricted during treatment. See heartworm medication cost for prevention pricing.

Dog Heartworm Test Cost