Dog Heartworm Treatment Cost: $300 to $1,800

A dog heartworm treatment costs $300 to $1,800 in the United States, and $1,200 is the typical price. Regionally the typical price runs from $500 in Columbus, Ohio (nonprofit clinic) to $1,296 in the Northeast — a 2.6x spread for the same procedure.

One price list shows exactly what your dog's weight does to this bill

Dog heartworm treatment cost is driven by body weight, because melarsomine is dosed by weight, and one nonprofit publishes the whole ladder. SPCA of Texas prices its treatment package as:

• $300 for a dog of 3 to 20 lbs
• $425 at 21 to 40 lbs
• $650 at 41 to 60 lbs
• $725 at 61 to 80 lbs
• $850 at 81 to 100 lbs

That is 2.8x across the same protocol, the same drug and the same disease. Each band follows the American Heartworm Society's three-injection protocol and includes doxycycline, prednisone, gabapentin, radiographs if needed and bloodwork.

Note before you plan around it: that page currently carries a notice that the treatment is unavailable until further notice. It is a real published price list, but not a bookable one today.

Three injections or two is a treatment choice, not a discount

The American Heartworm Society recommends three doses of melarsomine for every dog. The drug is also labelled for two doses given 24 hours apart in dogs with asymptomatic, mild or moderate disease, and AHS says that shorter course should clear approximately 90% of the worms.

Ninety percent is the number to hold. The two-dose protocol exists because it is cheaper and faster, and AHS is explicit that it is not the recommended approach.

So when one quote is half another, the first question is not about mark-up. It is how many injections are in the price, and what the plan is for the worms the short course leaves behind.

The two months before the injection the price is named after

Adulticide treatment does not begin when you say yes. AHS requires a four-week doxycycline course and a monthly macrocyclic-lactone preventive before melarsomine where it cannot be given immediately, with exercise restriction maintained throughout.

SPCA of Texas schedules its injections 60 days after the consultation. Two months of drugs, prevention and confinement are spent before the treatment starts.

That period is also where a cheap-looking quote quietly grows. Ask whether the doxycycline, the prednisone and the pre-treatment preventive doses are in the package price or billed separately — at SPCA of Texas they are included, which is not the norm.

Staging comes first and it is billed separately

A veterinarian has to establish how advanced the infection is before choosing a protocol. SPCA of Texas requires a non-refundable $40 deposit for a 40-minute staging consultation, prices pre-treatment bloodwork at $60 and possible radiographs at $75, and charges $25 for a heartworm test if the dog was diagnosed elsewhere.

The equivalent figures at a full-service practice are several times that. On CareCredit's national averages, a heartworm antigen test is $71, a CBC $104, a chemistry panel $164 and two to three radiographic views $172.

The gap between what a laboratory charges and what an owner pays is visible here for once. The University of Missouri's diagnostic laboratory charges a practice $18.00 for a heartworm antigen ELISA; the in-clinic test the owner pays $25 to $128 for costs the practice a fraction of the fee.

The cheapest tier is closed to the dogs that need it most

SPCA of Texas will not treat dogs aged seven and over, and cannot see pets aged nine and over at all, referring them to a full-service veterinary facility.

That restriction lands on exactly the population whose infection has had longest to progress. A ten-year-old heartworm-positive dog is priced out of the nonprofit tier by policy, not by the disease.

The other nonprofit route in our data is flat-rate rather than banded: Columbus Humane publishes $500 for heartworm treatment regardless of weight, alongside a $50 wellness examination and $125 comprehensive bloodwork. Our low-cost vet listings for Columbus cover the rest of that clinic's published pricing.

Flat rate or weight band: which is cheaper depends on the dog

The two nonprofit models in our data price the same treatment on opposite principles, and the crossover is easy to compute.

Columbus Humane charges a flat $500 regardless of weight. SPCA of Texas charges $300 at 3 to 20 lbs, $425 at 21 to 40 lbs, $650 at 41 to 60 lbs, $725 at 61 to 80 lbs and $850 at 81 to 100 lbs.

For a dog under about 40 lbs the weight-banded list is cheaper. Somewhere between 40 and 60 lbs the flat rate wins, and by 100 lbs it is $350 cheaper.

The point is not that you can choose between two clinics in different states. It is that a clinic's pricing model is worth asking about, because a big dog at a flat-rate clinic and a small dog at a banded one are both getting the better half of the deal.

The 50-state heartworm tables are testing prices, not treatment prices

This is the most-repeated error in the category and it is worth naming. CareCredit publishes a 50-state heartworm table, and the figures in it are the cost of testing a dog for heartworm, not the cost of treating one.

Those numbers get reprinted as treatment pricing across the web, which is how a reader ends up expecting a state-average heartworm bill of well under $100.

We deliberately did not use that table. The census-region rows further down this page are indexed from the national range instead, and they are labelled as estimates because that is what they are. The real spread in this procedure is not regional at all — it is the gap between a nonprofit clinic and a private practice, which CareCredit itself puts at $225 to $614 against $1,200 to $1,800.

Why is heartworm treatment so much more expensive at a regular vet?

Because the two tiers are buying different things. CareCredit reports reduced- cost protocols at $225 to $614 and warns in the same breath that low-cost protocols may not follow the AHS recommendations. Its $1,200 to $1,800 figure is for the average 40-pound dog at a full-service practice, citing AHS.

A full-service practice prices a staged case: its own hospitalisation capacity, individual monitoring around each injection, and the three-dose protocol AHS recommends for every dog.

A nonprofit clinic with a fixed protocol and a healthy young patient prices volume. Both are legitimate. They are not the same product, and the gap between $614 and $1,200 is where that difference lives.

Is prevention included in the treatment price?

No, and it is required during treatment. SPCA of Texas states directly that heartworm prevention is the one thing not included in its price and is still needed while the dog is being treated.

CareCredit puts prevention at a $14 national average per month, ranging $11 to $25; Columbus Humane publishes heartworm medication at $5. Over the two-month pre-treatment window and the twelve months that follow, that is $154 to $350 nobody quotes.

Set against a $1,200 to $1,800 treatment, that is the whole argument for prevention, and it is the same shape as every other lifelong-medication bill on this site — the Cushing's disease treatment cost page makes the annual version of the same point.

What this price does not cover

Class 3 disease and caval syndrome. In advanced infections the worm burden obstructs blood flow through the heart, and the dog needs hospitalisation or surgical removal of the worms rather than a course of injections.

Nothing we could verify publishes a US price for either. The high end of this page therefore reflects an uncomplicated adult infection only, and a severely-affected dog will cost more than $1,800.

Imaging is what separates the two pictures, and the dog ultrasound cost page prices that side of the workup. Everything else we have priced is on the vet cost index.

Dog Heartworm Treatment cost by region

These are the prices behind the range at the top of the page, one row per geography we could source. The basis column says how each row was arrived at.

What changes the price

Two invoices for the same procedure diverge for a small number of reasons. These are the ones that move the total most.

Body weight of the dog

Melarsomine is dosed by weight, and SPCA of Texas publishes the whole package that way: $300 at 3-20 lbs, $425 at 21-40, $650 at 41-60, $725 at 61-80 and $850 at 81-100. That is nearly a threefold spread for the same disease and the same protocol, and it is the largest single lever on the price

Two melarsomine injections or three

The American Heartworm Society recommends three doses for every dog. The drug is also labelled for two doses 24 hours apart in dogs with asymptomatic, mild or moderate disease, which AHS says should clear about 90% of the worms. The shelter protocol exists because it is cheaper and faster, and AHS is explicit that it is not best practice

Nonprofit clinic or full-service practice

CareCredit puts reduced-cost protocols at $225-$614 against $1,200-$1,800 for the average 40-pound dog at a full-service practice, and warns that low-cost protocols may not follow the AHS recommendations

The dog's age and other health problems

SPCA of Texas will not treat dogs aged seven and over and cannot see pets nine and over at all, referring them to a full-service veterinary facility. The cheapest tier in the market is closed to exactly the dogs whose disease has had longest to progress

The two months before the first injection

AHS requires a four-week doxycycline course and a monthly macrocyclic-lactone preventive before adulticide therapy when melarsomine cannot be given straight away, with exercise restriction maintained throughout. SPCA of Texas schedules the injections 60 days after the consultation. Two months of drugs and prevention are spent before the treatment the price is named after begins

Staging the disease

SPCA of Texas prices pre-treatment bloodwork at $60 and possible x-rays at $75; CareCredit's national averages are $104 for a CBC, $164 for a chemistry panel and $172 for two to three radiographic views. Staging decides whether the dog is a candidate for the cheap protocol at all

Prevention is not in the price

SPCA of Texas states that heartworm prevention is the one thing not included in the treatment price and is still required during treatment. CareCredit puts prevention at $14 a month nationally, ranging $11 to $25

What the itemized invoice looks like

Clinics quote a bundled number and itemize afterwards. This is the decomposition, so you can read a real estimate line by line before you sign it.

For dogs with asymptomatic, mild, or moderate disease, melarsomine dihydrochloride is also labeled for two treatments given 24 hours apart. Limiting the treatment course to two treatments should result in the clearance of approximately 90% of the worms.American Heartworm Society, Frequently Asked Questions on Heartworm Treatment in Shelters

Does pet insurance cover dog heartworm treatment?

Dog Heartworm Treatment is normally covered by a standard accident-and-illness policy. Heartworm treatment is covered by an accident-and-illness policy where the infection was not present before enrolment or during the waiting period - but a positive test at the adoption or enrolment examination excludes it, and that is when most dogs are tested. Prevention is not covered by an accident-and-illness policy at all; it belongs to a wellness add-on where one is offered. Carriers can also decline or restrict cover on a dog with a heartworm history, so the cheap outcome here is not the cheap treatment, it is never needing one.

What you would get back: 70-90% of the covered bill after the deductible, where the infection was acquired after the waiting period ended. A dog that tested positive before enrolment gets nothing.

Coverage rules differ enough between carriers that the only useful answer is a side-by-side: our pet insurance comparison for dog heartworm treatment shows which policies pay for it, what the waiting period is, and what counts as pre-existing.

Common questions

Why a pet needs dog heartworm treatment

The pages below are the reasons this bill happens. Each one carries the same price data you are reading, in the context of the problem that produces it.

Conditions treated with dog heartworm treatment

• dog coughing Can be an emergency — A cough is a sign, not a diagnosis, and the same dry hack can come from an infection that clears itself in two weeks or from a failing heart valve.
• worms in dogs Can be an emergency — Four different worms with four different stories, grouped together only because they all live in a dog's gut.

More surgery costs

• acl surgery cost dog — Dog ACL surgery costs $1,000 to $10,000, and up to 60% of dogs tear the other knee too.
• hernia dog surgery cost — Dog hernia surgery costs $150 to $5,000 because hernia names four operations.
• cherry eye dog surgery cost — Cherry eye surgery costs $275 at a nonprofit clinic, $544 on average and up to $1,900 with an ophthalmologist.
• hip dysplasia surgery cost dog — Dog hip dysplasia surgery costs $1,200 to $10,000.
• cost of hip replacement surgery in dogs — Dog hip replacement costs $6,000 to $10,000 per hip, but the two universities that publish a price bill $8,700 to $14,000 for the whole surgical episode..
• canine lipoma removal cost — Removing a fatty lump from a dog costs $250 to $1,800, and the first question is whether to remove it at all.
• luxating patella surgery cost — Luxating patella surgery costs $400 to $5,000 per knee.
• tplo dog surgery cost — TPLO dog surgery costs $2,500 to $7,500.
• how much does chemo for dogs cost — Dog chemotherapy costs $1,800 to $16,000.
• boas surgery costs — BOAS surgery costs $1,450 to $5,500.
• dog ear hematoma surgery cost — Dog ear hematoma surgery costs $535 to $1,804.
• dog bowel obstruction surgery cost — Dog bowel obstruction surgery costs $1,200 to $7,976.
• cat bowel obstruction surgery cost — Cat bowel obstruction surgery costs $755 to $5,500, about half the dog figure.
• cost of chemo for cats — Cat chemotherapy costs $2,500 to $9,500.
• dog ruptured anal-gland abscess treatment cost — A ruptured dog anal gland abscess costs $100 to $1,000 per episode.
• dog anus gland removal cost — Dog anal gland removal costs $650 to $5,600 — an 8.6x spread across nine published fee sheets, the widest on this site.
• entropion in dogs surgery cost — Entropion surgery for dogs costs $125 to $3,000 and is priced per eyelid, not per dog.
• eye removal surgery for dogs cost — Dog eye removal costs $200 at a nonprofit clinic and $3,000 at a full-service hospital.
• cost of leg amputation for dog — Dog leg amputation costs $735 to $6,800.
• dog splenectomy cost — Dog splenectomy costs $1,700 to $5,000 across seven published fee sheets.
• eye removal surgery cat cost — Cat eye removal costs $415 to $2,000, and both US clinics that split fees by species charge less for a cat than a dog.
• cat surgery costs — Cat surgery costs $350 to $6,282.
• dog tumor removal cost — Dog tumor removal costs $250 to $3,000, and histopathology is billed separately.
• cat pu surgery cost — Cat PU surgery costs $995 to $2,395 across thirteen published fee sheets.
• how much is a biopsy for a dog — A dog biopsy costs $144 to $1,110.
• cost of dog bladder stone surgery — Dog bladder stone surgery costs $587 to $5,000 across fifteen fee sheets.
• gastropexy cost — Gastropexy costs $600 to $2,200 planned and $2,200 to $7,500 as emergency bloat surgery.
• how much does it cost to fix paraphimosis in dogs — Fixing paraphimosis in dogs costs $300 to $1,500 on three published prices.
• cat cataracts surgery cost — Cat cataract surgery costs $2,000 to $2,500 per eye and $3,000 to $3,500 for both.
• broken leg dog surgery cost — Dog broken leg surgery costs $1,371 to $5,803.
• dog eye surgery cost — Dog eye surgery costs $300 to $6,700, and which operation your dog needs decides the bill.
• dog eyelid tumor removal cost — Removing an eyelid tumor from a dog costs $320 in general practice and $2,200 with an ophthalmologist.
• lymphoma dog treatment cost — Treating canine lymphoma costs $3,600 to $16,000.
• pyometra dog surgery cost — Dog pyometra surgery costs $500 to $4,000.
• salivary mucocele dog surgery cost — Salivary mucocele surgery in dogs costs $1,681 to $2,400 — three fee sheets within 1.4x.
• dog spinal surgery cost — Dog spinal surgery costs $2,500 to $15,000, and the MRI is billed first.
• cost of stenotic nares surgery — Stenotic nares surgery costs $485 to $1,519, a 3.1x spread between practices for the same short operation.
• how much are dog stitches — Dog stitches cost $182 to $2,600 because the word covers four different injuries.

Every procedure we have priced is listed on the vet cost index.

Sources

1. Frequently Asked Questions on Heartworm Treatment in Shelters — American Heartworm Society, 2026.
2. What Is Heartworm Disease in Dogs? — CareCredit (Synchrony), 2026.
3. How Does Heartworm Treatment Work, and What Does It Cost? — CareCredit (Synchrony), 2025.
4. Heartworm Treatment — SPCA of Texas, Dallas, 2026.
5. Community Healthcare and Enrichment Center Veterinary Services — Columbus Humane, Columbus, Ohio, 2026.
6. Veterinary Costs: The Average Cost of Vet Visits and Procedures — CareCredit (Synchrony), 2026.
7. Canine Tests and Fees — Veterinary Medical Diagnostic Laboratory, University of Missouri, 2026.