Both dogs and cats can have heart murmurs, and this is usually the first sign that heart disease is present. Cats are are different than dogs though. They can have benign heart murmurs and no heart disease or can have no murmur and significant heart disease.
The diagnostic test of choice to determine the cause of a heart murmur is an echocardiogram or ultrasound of the heart. The echocardiogram is a non-invasive test which allows us to look at the anatomy of the heart chambers, valves, and great vessels entering and leaving the heart. During this study we can determine the cause of the heart murmur.