Which animal is particularly at risk for developing heartworm disease?

Dogs are particularly at risk for developing heartworm disease due to their biological and environmental factors. Heartworms, specifically Dirofilaria immitis, are transmitted through mosquito bites, and dogs are the primary host for these parasites. This means that when a dog is bitten by an infected mosquito, the larvae can develop into adult heartworms within the dog's bloodstream, leading to serious health issues, including heart failure and even death if left untreated.

While cats can also contract heartworms, they are not as commonly affected as dogs. The heartworm lifecycle and larval development are less optimal in cats, which often leads to fewer worms developing and a different clinical presentation. Other animals like rabbits and birds are not typical hosts for heartworms, and their anatomy and immune responses generally prevent the establishment of these parasites. This makes dogs the most susceptible species, highlighting the importance of preventive care, including regular testing and administration of heartworm preventatives for canine patients.