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 parasitic worms in the heart and pulmonary arteries, transmitted by mosquitoes. Treatment uses arsenic-based injections (melarsomine) to kill the worms. As worms die and break apart, strict rest is required 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. No running, playing, or excitement - crate rest, leash walks for bathroom only. As worms die, fragments travel to the lungs; exercise increases 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 dog tests negative at enrollment and positive after waiting period. Some exclude heartworm entirely or require consistent prevention proof. Coverage includes diagnostics, injections, hospitalization, and medication.
Standard illness waiting period: 14 days. A positive heartworm test before or during becomes pre-existing. Some insurers require a negative heartworm test at enrollment. Missed prevention doses may affect coverage.
$1,000-$3,000 treatment exceeds most deductibles. With $500 deductible and 80% reimbursement, you save $400-$2,000. Bigger savings come from complications: heart failure or pulmonary embolism treatment can add thousands more.
Some policies exclude heartworm treatment if owner failed to maintain prevention. Pre-existing infection never covered. Preventive medication is classified as wellness, not covered by standard policies. Some wellness add-ons reimburse prevention costs.
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