Hill's® Prescription Diet® z/d® Canine Small Bites is a complete and balanced food that provides all the nutrition your dog needs. It is appetizing kibble for small jaws. It Promotes healthy skin barrier and supports a healthy immune system. There are High levels of vitamin E and natural fiber. Hill's nutritionists and veterinarians developed Prescription Diet® z/d® Small Bites clinical nutrition especially formulated to support your dog's skin and food sensitivities. Z/d is clinically proven nutrition to help avoid adverse reactions to food. This product requires a veterinary prescription.