Stories are told and songs are written about the strength of the human heart, the most important organ in the body. The heart is no less vital for dogs. It is responsible for pumping blood through the body and for keeping everything in good working order. But when the heart's own needs are not met, poor circulation and inflammation weaken the circulatory system and lead to heart disease. No cardiac irregularity in your dog should go unnoticed. By paying attention to early warning signs, taking preventative steps, and using natural treatments, it's possible to avert disease.