Hello and welcome to the forum. The type of protein is important, digestibility being the key feature. From what I understand, dogs digest animal protein more easily than protein from other sources. You therefore want to be looking for a food with a named meat source right at the top of the list of ingredients. We can help you to source a suitable food but it would be useful if you could ask the vet what percentage of protein (dry matter) she would like your dog to have. We also need to know if you are wanting dry food or wet. I think you would be better off with wet since it does not dehydrate the dog. However, dry food can be moistened with water and I think it might be useful to do this routinely.