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.
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:
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