Select a disease:
View Map

Risk of Heartworm Infection in Dogs and Cats

Pets & Breed Sizes Prone to Heartworm Infection

Cats

Toy/Small Dogs

Medium Dogs

Large Dogs

Giant Dogs

The Southeastern states have the highest prevalence of dogs testing positive for heartworms.
Although the risk of heartworm infection is highest in warmer months, dogs are susceptible year-round.
Share