Heartworm treatment costs $1,000-$3,000 - but prevention costs only $50-$200 per year. Parasitic worms transmitted through mosquito bites lodge in the heart and lungs. Left untreated, it's fatal. Treatment requires melarsomine injections and months of strict rest. Prevention is simple, cheap, and far safer.
Dirofilaria immitis - parasitic worms transmitted through mosquito bites. Larvae mature into adult worms over 6-7 months, lodging in the heart, lungs, and blood vessels. Adults reach 12 inches long. Without treatment, worm burden grows each season. Present in all 50 US states
Early: mild cough, fatigue after activity. Progressive: persistent cough, exercise intolerance, decreased appetite, weight loss. Advanced: swollen belly from fluid, difficulty breathing, heart failure. Symptoms may take months to appear. Often no symptoms early on
Simple blood test (antigen test) detects adult female heartworms in minutes. Costs $35-$75. If positive: chest X-rays ($150-$300) and blood work ($100-$200) assess damage before treatment. Average $35-$75
Melarsomine (immiticide) injections kill adult worms - given as 3 injections over weeks. Pre-treatment: doxycycline and steroids. Dogs require strict exercise restriction for 2-3 months. Severe cases may need hospitalization. Average $1,000-$3,000
Testing, X-rays, blood work, treatment, and follow-up. Severe cases with complications cost $2,500-$3,500+.
Any dog bitten by an infected mosquito is at risk. Outdoor dogs in warm climates face highest exposure.
Absolute exercise restriction during treatment. Dead worms break apart and can cause embolisms. 2-3 months crate rest.
Monthly preventives (Heartgard, Interceptor, Simparica Trio) are nearly 100% effective. $50-$200/year.
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Testing, X-rays, blood work, treatment, and follow-up.
Most accident-and-illness policies cover heartworm treatment if your dog tests negative at enrollment. Standard 14-day illness waiting period applies. Treatment costs of $1,000-$3,000 make this a condition where insurance clearly pays off.
Many insurers require proof of heartworm prevention to cover treatment. If your dog gets heartworm without documented preventive use, your claim may be denied. Some policies specifically exclude heartworm if prevention lapsed. Keep all receipts.
Treatment at $1,000-$3,000 easily exceeds most deductibles. With a $500 deductible and 80% reimbursement, you save $400-$2,000. Some wellness plans cover preventive medication separately - $50-$200/year additional savings. Check if your plan offers a preventive add-on.
If your dog tests positive before or during enrollment, heartworm is permanently excluded as pre-existing. Even after successful treatment, some insurers won't cover future complications. Always get a negative test before enrolling.
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That moment stuck with me. When you're scared, you'll pay anything - and some vets price accordingly. I dug into vet costs and insurance. Confusing policies, buried exclusions, impossible to compare. So I built the resource I wish existed: real costs, real exclusions, plain language. Not here to sell you a policy. Here so you don't get blindsided.
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