Please note - for customers who fed this diet prior to the inclusion of ActivBiome+ technology, you are advised to gradually transition your dog to the upgraded formula over a 7-day period. Please consult your veterinarian for further information.Hill's PRESCRIPTION DIET z/d dog food is clinical nutrition specifically designed to support your dog's food sensitivities. This food for dogs with sensitive stomachs is clinically proven to reduce skin & digestive reactions caused by food intolerances. It is a dog food with hydrolyzed protein to help avoid negative food reactions and with new ActivBiome+ Technology for digestion. This dry food has a delicious taste that your dog will love. Food sensitivities and intolerances are potentially serious problems that can lead to irritated skin- & coat and ear problems and even gastrointestinal- problems. Dogs that have adverse food reactions due to a food allergy (usually to a protein in the food) or intolerance benefit from a food designed for fo