Heartworm Treatment Cost in Colorado (2026)

Vet costs in Colorado are 10% 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 Colorado 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 Colorado

City	Wellness Exam	Notes
Denver	$74	High pet ownership density; above state avg
Boulder	$82	Highest in CO; affluent demographics
Colorado Springs	$68	Below Denver; competitive market
Fort Collins	$70	University city; near state avg

Heartworm Treatment Cost in Colorado — FAQ

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

Heartworm treatment in Colorado averages $1,650 in 2026 — 10% 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 Colorado?

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 $1,650 in Colorado is the only AHS-approved treatment. Humane societies and veterinary schools sometimes offer discounted treatment.

What happens if heartworms are left untreated in Colorado?

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 Colorado, heartworm prevention costs $130/year — about 8% of what treatment costs. Prevention is the clear choice.