Our vision:

A world without heartworms.

More than a million pets in the U.S. have heartworms. But heartworm disease is preventable.

True to its mission of leading the veterinary profession and public in understanding heartworm disease, the American Heartworm Society sponsors heartworm education and research.

2019 Heartworm Incidence Map

No state is heartworm-free

An American Heartworm Society survey of approximately 6,000 veterinary practices and shelters determined that heartworm disease continues to be diagnosed in all 50 states.
Managing heartworm during the COVID-19 pandemic

Managing heartworm during the COVID-19 pandemic

Heartworm management is a cornerstone of pet health care, but the need to reduce the risk of the COVID-19 virus has triggered questions from veterinarians. The American Heartworm Society has released recommendations to help.
Pet Owner Video Explaining Heartworm Disease

How do pets get heartworms?

Heartworm disease is a devastating disease that starts with a single mosquito bite. Learn how pets get heartworms—and how heartworms can be prevented.
Heartworm Guidelines

Preventing, diagnosing and treating heartworms

The American Heartworm Society is the veterinary profession’s leading resource on heartworm information. Our guidelines for heartworm management in dogs and cats incorporate the latest science and expert recommendations.