Prescription pet food is food formulated and prescribed by veterinarians with intent to help pets with food sensitivities. Unfortunately, the ingredients are not much different from traditional dried kibble and is loaded with synthetic vitamins and minerals that are hard to process/digest and the main ingredients are by-products.
how to feed
Because prescription pet food is filled with by-products, starchy, processed carbohydrates, inferior ingredients that are not bioavailable and lots of synthetic vitamins and minerals (excess Vitamin D, at that) we do not recommend you feed your dog any prescription diets sold by a Vet.
Hill's Science Diet recently had a recall for excess Vitamin D in their foods which led to vomiting, lethargy, kidney failure and some dogs even died. More and more food from Hill's they are finding has excess Vitamin D, if you can't trust what your vet tells you, who are you supposed to trust?