The main reason diabetics are cautious when it comes to potatoes is their very high glycemic index (GI) value. The glycemic index is important for diabetics because it is a measure of the impact a particular food has on blood glucose levels once it has been digested.
The two most common causes of congestive heart failure in dogs are mitral valve insufficiency and dilated cardiomyopathy. In cats, hypertrophic cardiomyopathy is the most common heart disease. Genetic predisposition is clearly the most common underlying reason for the development of congestive heart failure.
Fatigue. The end stages of heart failure typically show with fatigue in dogs. Your pet may be unwilling or unable to move around and some show heavy, laboured breathing after exertion. He may become less active and tire easily. Your dog may suddenly collapse or faint (called syncope).