Heartworm Treatment Cost: $1,000–$3,500 for Dogs (2026)
Heartworm treatment costs $1,000–$3,500 for the full protocol: three melarsomine injections over 60 days, antibiotics, steroids, and strict cage rest. Monthly prevention costs $6–$18. A lifetime of prevention is cheaper than one treatment. The American Heartworm Society reports heartworm in all 50 states — this isn't a regional problem anymore.
Cost at a Glance
Dog
$0–$0
Private vet, national avg
CA / NY
$0–$0
25–35% above avg
What Affects the Cost
- ▸ Treatment is a 60-day process, not a single visit. Day 1: first injection. Day 30: second injection. Day 31: third injection. Plus 30 days of doxycycline before injections start. Total treatment timeline: ~90 days with strict exercise restriction.
- ▸ Cage rest is not optional. Dead heartworms break into fragments that travel to the lungs. Exercise increases blood flow and can cause fatal pulmonary embolism. Your dog must be confined for 6–8 weeks after the last injection. This is the hardest part for most owners.
- ▸ Prevention costs $72–$216/year. Treatment costs $1,000–$3,500 once, plus the risk of permanent heart/lung damage. There's no scenario where skipping prevention saves money.
- ▸ No approved treatment for cats. Cats get supportive care and wait for worms to die naturally (2–4 years). Even 1–2 worms can kill a cat. Monthly prevention is the only protection.
- ▸ Rescue dogs from the South are high-risk. Heartworm prevalence is highest in the Gulf Coast states and Mississippi River valley. Always test rescue and adopted dogs regardless of stated history.
Cost by State
National average adjusted by state cost-of-living index. Urban areas run ~30% higher than suburban; rural ~25% lower.
| State | Dog | vs. Avg |
|---|---|---|
| Alabama | $0–$0 | -18% |
| Alaska | $0–$0 | +25% |
| Arizona | $0–$0 | -5% |
| Arkansas | $0–$0 | -20% |
| California | $0–$0 | +35% |
| Colorado | $0–$0 | +10% |
| Connecticut | $0–$0 | +25% |
| Delaware | $0–$0 | +5% |
| Florida | $0–$0 | 0% |
| Georgia | $0–$0 | -10% |
| Hawaii | $0–$0 | +40% |
| Idaho | $0–$0 | -10% |
| Illinois | $0–$0 | +5% |
| Indiana | $0–$0 | -12% |
| Iowa | $0–$0 | -15% |
| Kansas | $0–$0 | -15% |
| Kentucky | $0–$0 | -15% |
| Louisiana | $0–$0 | -15% |
| Maine | $0–$0 | 0% |
| Maryland | $0–$0 | +15% |
| Massachusetts | $0–$0 | +30% |
| Michigan | $0–$0 | -10% |
| Minnesota | $0–$0 | 0% |
| Mississippi | $0–$0 | -22% |
| Missouri | $0–$0 | -15% |
| Montana | $0–$0 | -8% |
| Nebraska | $0–$0 | -12% |
| Nevada | $0–$0 | +5% |
| New Hampshire | $0–$0 | +10% |
| New Jersey | $0–$0 | +25% |
| New Mexico | $0–$0 | -12% |
| New York | $0–$0 | +30% |
| North Carolina | $0–$0 | -8% |
| North Dakota | $0–$0 | -12% |
| Ohio | $0–$0 | -10% |
| Oklahoma | $0–$0 | -18% |
| Oregon | $0–$0 | +10% |
| Pennsylvania | $0–$0 | 0% |
| Rhode Island | $0–$0 | +10% |
| South Carolina | $0–$0 | -12% |
| South Dakota | $0–$0 | -15% |
| Tennessee | $0–$0 | -12% |
| Texas | $0–$0 | -8% |
| Utah | $0–$0 | -5% |
| Vermont | $0–$0 | +5% |
| Virginia | $0–$0 | +5% |
| Washington | $0–$0 | +15% |
| West Virginia | $0–$0 | -20% |
| Wisconsin | $0–$0 | -8% |
| Wyoming | $0–$0 | -10% |
Data: AVMA fee surveys, BLS cost-of-living data. Ranges reflect typical private practice prices — low-cost clinics and university teaching hospitals charge significantly less.
Common Questions
How much does heartworm treatment cost for a dog? ▼
Can cats get heartworm? ▼
What happens if I don't treat heartworm in my dog? ▼
How much does monthly heartworm prevention cost? ▼
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Use the Full CalculatorData: Nationwide Pet Insurance Claims Data, AVMA U.S. Pet Ownership and Demographics Sourcebook, APPA National Pet Owners Survey, VECCS Emergency Cost Data
Last updated: March 2026
How we calculate this · Pet insurance terms vary. Read the policy carefully, especially exclusions for pre-existing and breed-specific conditions.