What is a common symptom of heartworm disease in dogs?

Coughing is a common symptom of heartworm disease in dogs because the adult heartworms reside in the pulmonary arteries, which are located in the lungs. As the worms grow and reproduce, they cause inflammation and damage to the blood vessels, leading to coughing as a primary response. This is often a result of the dog’s body reacting to the presence of the worms, and it can vary in severity depending on the number of worms present and the overall health of the dog.

While vomiting, diarrhea, and lethargy can also be associated with heartworm disease or other health issues in dogs, coughing is one of the most distinctive signs that veterinarians look for during examinations for heartworm. Early detection and treatment are crucial since the condition can progress to more severe issues, such as heart failure, if left untreated.