Home - American Heartworm Society

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.

Find Heartworm Resources Here

Support the AHS mission

Heartworm disease can be a devastating disease—and it’s also one of the most preventable diseases in pets. You can help the American Heartworm Society expand our educational mission by supporting us in one of the following ways:

Become a member. AHS members receive the AHS Bulletin, participate in exclusive quarterly Zoom discussions with AHS experts and receive special pricing on client brochures and Triennial Heartworm Symposium registration.
Donate. Looking for a good cause? Both one-time and ongoing donations help us make a difference in the lives of people, their pets, and the veterinary professionals devoted to caring for them.

Find your heartworm resources here

Every three years, the AHS conducts a Heartworm Incidence Survey with U.S. veterinary practices and shelters and creates a new incidence map showing where heartworms are being diagnosed in dogs. The latest survey was conducted in early 2026 and gathered data on diagnoses from throughout the 2025 calendar year. Check out our new map and all the details!

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.

When warm weather hits, you will want to ramp up your heartworm education efforts. To help make this goal easy--and fun--the AHS has created a new set of posters to print or post on your social pages.

To save or print a poster, just click on the image below, then click on the “download” button and save the PDF file.
To save a poster for use on your social pages, simply open the downloaded poster, then right click on the file and follow the menu instructions to save the file as a JPEG image.