A healthy, happy dog needs a healthy heart. To understand the treatments that combat heart disease in dogs, it's important to understand how a normal, healthy heart works.

The heart is part of the circulatory system, along with the lungs and blood vessels. The pumping of the heart pushes blood on its journey through the vessels, and around the body.

You can hear a dog's normal heart beat, as heard through a stethoscope, by clicking here.