DATA-BACKED GUIDE · UPDATED JULY 2026
What Does a Year of Heartworm Testing and Prevention Cost?
Heartworm protection is really two costs bundled together: the annual test and the twelve months of prevention that follow. Vets treat them as a pair because they refill prevention off the back of a clean test. Looking at the yearly total, rather than just the test, gives you a truer picture of what heartworm care costs and where you can trim it.
The quick version
- Yearly heartworm care is a test plus twelve months of preventive medication.
- The prevention, not the test, is usually the larger part of the annual cost.
- Where you buy prevention, whether the vet or an online pharmacy, changes the total a lot.
- Year-round prevention is standard advice now, even in colder states.
- Combo products that also cover fleas and ticks cost more but replace separate meds.
What people actually paid
The gap: advertised vs actually paid (medians)
People reported paying 71% more than the advertised list price for heartworm.
List prices are advertised prices; paid figures are what people reported, often for different cases. Treat the gap as a signal, not a quote.
Real prices, in people's own words
- $35“Heart worm rest 35, rabies 14.15 and dhpp 24.15”
- $36“Both dogs received Zoetis (ZD) heartworm rapid test $36.00 Bordetella Oral $23.00”
- $48“Heart worm 48.30”
- $65“Liberty Veterinary Clinic — Diag.Lab.Snap Test $65”
- $73“Annual Vaccines & Heartworm Injection — Total: $73 — preventative care for dog”
- $104“Confirmation Blood Panel $104”
Genuine amounts posted publicly. We publish the price and the quote, never the person.
Why the price varies so much
Two things move the yearly number the most: your dog's weight and where you buy. Prevention is dosed by weight, so a big dog costs more to protect than a small one. And the same product can be noticeably cheaper from an online pharmacy than from the in-house shelf, which is the easiest lever most owners have. Your region affects how aggressively heartworm is managed, and whether you pick a heartworm-only product or a combo that also handles fleas and ticks changes the price. The test portion is relatively stable, so the prevention choices are where your yearly total is really decided.
How to pay less
- Price the prevention at Chewy Pharmacy and against GoodRx for Pets before buying in-house.
- Buy in twelve-month packs, which usually cut the per-dose price versus short packs.
- Look for manufacturer rebates and instant coupons, which are common on the big prevention brands.
- Bundle the annual test into the wellness exam so you are not paying a standalone visit fee.
- Consider whether a combined heartworm, flea, and tick product is cheaper than buying each separately.
- Ask your vet to write a prescription so you are free to fill it at the cheapest pharmacy.
Common questions
Is prevention really needed all twelve months?
Most vets now recommend year-round prevention even in colder states, because mosquito seasons are unpredictable and consistent dosing is what keeps protection reliable. Skipping winter months is how gaps and infections happen.
Is buying prevention online safe?
Yes, from reputable pharmacies like Chewy Pharmacy that require a valid prescription. Be wary of sellers that do not ask for a prescription or offer prices that seem too good, which can signal counterfeit or improperly stored product.
What is the difference between heartworm-only and combo products?
Heartworm-only meds cover just heartworm, and often intestinal worms. Combo products add flea and tick protection in one dose. Combos cost more per dose but can end up cheaper than buying separate flea, tick, and heartworm products.
Does pet insurance cover heartworm prevention?
Standard accident-and-illness plans usually do not cover routine prevention unless you add a wellness rider. They would, however, help with the much bigger cost of treating a heartworm infection. Read your policy's preventive terms.
Why does my big dog's prevention cost more than my neighbor's small dog?
Heartworm preventives are dosed by body weight and sold in weight tiers. Larger dogs fall into higher-priced tiers. It is the same reason a year of prevention for a giant breed costs more than for a small one.