Dilated Cardiomyopathy (DCM) is a disease of the heart muscle. Although it is known that DCM can be caused by specific nutritional deficiencies, in many cases the cause of the disease is unknown. There are various theories, however. These include genetic factors, viral infections, exposure to chemical toxins and, amino acid deficiency.

DCM is more common in medium to large breeds of dog rather than small dogs. Some breeds are more susceptible to the disease than others, for example, Dobermann, Cocker and Springer Spaniels, Boxer, Irish Setters, German Shepherds, Great Danes, St Bernard and Irish Wolfhounds. Middle- aged male dogs tend to be most affected.

In DCM the heart fails to pump effectively. The contractions of the heart are weak and blood is not supplied to the body as efficiently as previously. In addition, the heart stretches and enlarges.

Because the heart's ability to pump is impaired, circulation is also impaired. For a time your dog's body may make adjustments to allow it to cope. However, at some point, the disease overrides the adjustments that have been made and the dog can become unwell and shows signs of heart failure. DCM may affect your dog's body in a number of different ways.