Hill's nutritionists and veterinarians developed Prescription Diet® k/d®, clinical nutrition to support your dog's kidney function and help sustain muscle mass.  In fact, the nutrition of k/d is clinically tested nutrition to improve & lengthen quality of life. It has Enhanced Appetite Trigger (E.A.T.)TM Technology for dogs. It has a High level of essential amino acids - the building blocks of muscle protein. It Enhances appetite & increases food intake. This product requires a veterinary prescription.