Heartworm Treatment Cost in California (2026)

Vet costs in California are 35% 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 California 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 California

City	Wellness Exam	Notes
San Francisco	$110	Among highest in the US; 70% above national avg
Los Angeles	$90	High demand, high overhead
San Diego	$85	Near state major-metro avg
Sacramento	$75	More affordable than coastal metros
San Jose	$95	Tech corridor wages push prices up

Heartworm Treatment Cost in California — FAQ

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

Heartworm treatment in California averages $2,030 in 2026 — 35% 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 $160 and is far less expensive.

Is there a cheaper heartworm treatment option in California?

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 $2,030 in California is the only AHS-approved treatment. Humane societies and veterinary schools sometimes offer discounted treatment.

What happens if heartworms are left untreated in California?

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 California, heartworm prevention costs $160/year — about 8% of what treatment costs. Prevention is the clear choice.