Heartworm treatment in dogs costs $1,000-$3,000 for the full protocol. Treatment involves a series of Immiticide (melarsomine) injections to kill adult heartworms, combined with strict exercise restriction for 2-3 months. Prevention costs $50-$200 per year — treatment costs 10-30 times more.
Heartworm disease is caused by foot-long parasitic worms living in the heart and pulmonary arteries, transmitted by mosquitoes. Treatment kills the adult worms using arsenic-based injections (melarsomine/Immiticide). As worms die, they break apart and are absorbed by the body — this process is dangerous and requires strict rest to prevent fatal pulmonary embolism. Prevention costs $50-$200/year vs $1,000-$3,000 to treat
The standard protocol spans 2-3 months. First: 30 days of doxycycline antibiotic and heartworm preventive. Then: first melarsomine injection (day 60). One month later: two more injections 24 hours apart (days 90-91). Strict exercise restriction throughout — the most critical part. Follow-up heartworm test 6 months after treatment. Strict rest is absolutely critical
Diagnostics (X-rays, blood work): $200-$400. Doxycycline (30 days): $50-$100. Melarsomine injections (3 total): $500-$1,500. Hospitalization for injections: $200-$500. Prednisone and pain medication: $50-$100. Follow-up testing: $50-$100. Severe cases needing surgical worm extraction cost $5,000+.
Strict exercise restriction for 2-3 months — this is the hardest part. No running, playing, or excitement. Crate rest or confined to a small room. Leash walks for bathroom only. As worms die and decompose, fragments travel to the lungs. Exercise increases heart rate and blood flow, risking fatal pulmonary thromboembolism. Exercise restriction is life or death
Full treatment protocol. Severe cases cost more. Monthly prevention at $5-$15/month prevents this entirely.
Treatment carries real risks. Dying worms can cause pulmonary embolism. Severe infections have higher complication rates.
Full protocol takes 2-3 months. Follow-up testing at 6 months. Restriction throughout the entire treatment period.
When a heartworm test is positive. Treatment should begin promptly — the longer worms are present, the more heart and lung damage occurs.
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Full treatment protocol.
Many policies cover heartworm treatment if the dog tests negative at enrollment and tests positive after the waiting period. Some policies exclude heartworm treatment entirely or require proof of consistent prevention. Coverage typically includes diagnostics, injections, hospitalization, and medication.
Standard illness waiting period of 14 days. A positive heartworm test before or during the waiting period makes it pre-existing. Some insurers require a negative heartworm test at enrollment. If your dog was on prevention but missed doses, coverage may be affected.
At $1,000-$3,000, heartworm treatment exceeds most deductibles. With a $500 deductible and 80% reimbursement, you save $400-$2,000. The bigger savings come from treating complications — heart failure or pulmonary embolism treatment can add thousands more.
Some policies exclude heartworm treatment if the owner failed to maintain prevention. Pre-existing heartworm infection is never covered. Preventive heartworm medication is classified as wellness and not covered by standard policies. Some wellness add-ons reimburse prevention costs.
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