Learning that your dog has ... of a heart murmur, lethargy, chronic coughing, and fainting. Left untreated, heart disease can progress to congestive heart failure (CHF). Symptoms of this more ...

But it’s important to see a cardiologist or cardiothoracic surgeon if: your primary care doctor has told you that you have a heart murmur, and you have symptoms of an abnormal heart murmur, or you ...