What is a notable sign of lungworm in dogs?

A notable sign of lungworm in dogs is bloody stool. Lungworm, particularly caused by the parasite Angiostrongylus vasorum, can lead to various health issues, including significant internal bleeding. When these parasites affect the dog's respiratory system, they can also cause blood clotting disorders, which might manifest as bloody feces. This symptom is particularly alarming and requires immediate veterinary attention, as it indicates a serious condition that could be life-threatening if not treated promptly.

Other symptoms that may accompany lungworm infection include coughing, respiratory distress, and lethargy, but bloody stool stands out as a specific indication of the condition’s severity and potential complications. Recognizing such symptoms not only aids in the diagnosis of lungworm but also allows for timely intervention to support the dog's health.