Heartworm Treatment Cost in Illinois (2026)

Vet costs in Illinois are 5% above national avg, so heartworm treatment prices run higher here too. Exact costs depend on your pet's size, age, and which clinic you use. The breakdown below shows what Illinois clinics charge for heartworm treatment in 2026, how each line item compares nationally, and practical ways to save. Low-cost clinics and humane societies can cut some of these prices by half or more.

Vet Cost by City in Illinois

City	Wellness Exam	Notes
Chicago	$72	Urban market; above state avg
Naperville	$70	Affluent suburb; near Chicago
Rockford	$62	Below state avg
Springfield	$63	Capital; rural-adjacent pricing

Heartworm Treatment Cost in Illinois — FAQ

How much does heartworm treatment cost for a dog in Illinois?

Heartworm treatment in Illinois averages $1,580 in 2026 — 5% above the national average. The standard melarsomine protocol (3 injections over 2 months plus pre-treatment bloodwork, X-rays, and strict exercise restriction) typically runs $1,000–$2,500 total. Annual heartworm prevention costs $130 and is far less expensive.

Is there a cheaper heartworm treatment option in Illinois?

The 'slow kill' method (monthly ivermectin without melarsomine) is cheaper but takes 1–2 years, doesn't kill adult worms directly, and is no longer recommended by the American Heartworm Society due to resistance concerns. The standard melarsomine protocol at $1,580 in Illinois is the only AHS-approved treatment. Humane societies and veterinary schools sometimes offer discounted treatment.

What happens if heartworms are left untreated in Illinois?

Untreated heartworm disease is fatal. Adult worms grow up to 12 inches long inside the heart and pulmonary arteries, causing progressive heart and lung damage. Dogs with heavy worm burdens develop congestive heart failure within 1–3 years. In Illinois, heartworm prevention costs $130/year — about 8% of what treatment costs. Prevention is the clear choice.