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.
Urgent: Submit Your 2025 Heartworm Data
The American Heartworm Society (AHS) is asking veterinarians to contribute to the profession’s understanding of heartworm disease in the U.S. by participating in the 2025 AHS Heartworm Incidence Survey.
The AHS maps, which date back to 2001, are generated every three years and are widely used by veterinarians, animal shelters, animal rescue organizations and media to educate the pet-owning public about the threat of heartworm disease. The maps, which are built using data submitted by thousands of veterinary practices and animal shelters, also provide vital insights for veterinary professionals about heartworm incidence trends and the spread of heartworms into new areas of the country.
The deadline to submit survey data is February 14, 2026. The new 2025 AHS map will be made public in April as part of Heartworm Awareness Month.
Veterinarians participating in the survey are eligible for a gift card drawing (see terms and conditions). Only one survey per practice will be accepted.
Find your heartworm resources here
Whether you’re a veterinarian looking for info on heartworm—or you’re a dog or cat owner who wants heartworm disease explained in easy-to-understand language—you’ve come to the right place. Our Resource Center will link you to hundreds of heartworm education tools, from articles, podcasts and videos to brochures, posters and infographics.
Every asset on the American Heartworm Society (AHS) website can be downloaded for free, because it’s our mission is to lead the veterinary profession and the public in the understanding of heartworm disease.
Subscribe to AHS Updates
Stay up to date on all things heartworm by subscribing to free updates from the American Heartworm Society. When there’s new science to share, new continuing education opportunities, new educational resources or new tools for you to use, you’ll be among the first to know about them. Subscription is free!
Preventing, diagnosing and treating heartworms
According to a 2025 veterinary survey conducted by the AHS, the American Heartworm Society’s canine and feline guidelines are the leading resources for veterinary practitioners looking for scientific guidelines on heartworm management in dogs and cats. Our guidelines are considered living documents and are continually updated to incorporate the latest science and expert recommendations.
