Below are the typical symptoms of heartworm disease. However, by the time these symptoms become apparent in your dog, the disease – and damage – may already be extensive.

If your dog exhibits any of the following symptoms, get to your vet as soon as possible for a proper diagnosis and treatment plan.

Initial Symptoms:

• Lethargy and Fatigue
• Coughing
• Weight Loss
• Lack of Appetite
• Intolerance of even regular exercise

Advanced Symptoms (Requiring Surgical Intervention)

• Swollen Belly
• Labored Breathing
• Pale Gums
• Dark Bloody or Coffee-Colored Urine

(Source: HeartwormSociety.org)