ProHeart 6 Logo

Heartworm disease and your dog

Heartworm disease is a serious, potentially fatal illness

That’s no joke! Cases have been diagnosed in all 50 states4—so it’s important to protect your dog no matter where you live.

How do dogs get infected?

The short answer: mosquitoes. A single bite from an infected mosquito can put your dog at risk for developing heartworm disease.


A mosquito bites an infected animal and takes in young heartworms as it feeds.

You may be thinking, “This can’t happen to my dog!” Unfortunately, it can. Dogs that spend lots of time outside when mosquitoes are feeding may have a higher risk, but even dogs that rarely go outside are at risk. (We’ve all gotten mosquito bites in a house or car. So can your dog.)

Heartworm disease is a risk no matter where you live

Average number of cases per reporting clinic:

Heartworm Map

The severity of heartworm incidence as shown in this map is based on the average number of cases per reporting clinic. Some remote regions of the United States lack veterinary clinics, therefore we have no reported cases from these areas.

©2016 American Heartworm Society

Heartworm disease: symptoms and treatment.

Learn the Warning Signs

See the ProHeart 6 difference.

About ProHeart 6