Keep your dog's heart and circulatory system in the best shape possible, a healthy diet and exercise is your number one defense against a number of conditions and diseases. Some of the most common conditions that may affect the dog heart and circulatory system include heartworms, heart attacks, and aoritic stenosis, to name a few. There are a number of effective treatments for dog heart conditions that can be administered by your veterinarian. In some cases, medication may be enough to treat a heart condition while surgery may be required in others. Learn more about the dog heart and circulatory system, diseases and conditions of, symptoms, treatments, and prevention below.