Cats and dogs can undergo significant metabolic changes when recovering from surgery, illness or injury, making it even more important to feed the right food to help them bounce back from these tough situations. Prescription Diet a/d is formulated with: Exceptional taste to encourage eating in sick inappetent pets High levels of high quality and easily digestible protein and fat to meet increased energy needs High levels of clinically proven antioxidants to support immune system Increased levels of B vitamins, potassium and added zinc to support recovery