Prescription Diet^® z/d low fat hydrolyzed soy recipe is clinical nutrition to help avoid skin and digestive signs of adverse food reactions in dogs. It’s made in the USA with global ingredients you can trust and was developed by Hill’s^® nutritionists and veterinarians. This nutrition is fortified with Hill's proprietary ActivBiome+ ingredient technology clinically shown to rapidly activate the gut microbiome and help normalize stool. Formulated without intact animal protein sources and to promote a urinary environment that reduces the risk of developing struvite and calcium oxalate crystals.