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.
Renal failure in dogs occurs when your dog's kidneys can no longer function well enough to clear the toxins from your dog's body. Acute renal failure is sometimes reversible; chronic renal failure requires fluid therapy and sometimes other medications to compensate for your dog's lack of kidney function.