Hill's Prescription Diet Derm Complete dry dog food is clinically tested nutrition for both food and environmental sensitivities. It’s made in the USA with global ingredients you can trust, and was developed by Hill’s nutritionists and veterinarians. This nutrition is formulated to promote an environment that makes it difficult for struvite and calcium oxalate crystals to form. Please consult your veterinarian for further information on how Prescription Diet foods can help your dog continue to enjoy a happy and active life.