I have a 6 yr old Bouvier cross with king Shepard. He is very active. I took him to the vet and had blood work came back elevated kidney levels. Vet told me to put on kidney vet diet and to retest in 6 months. Only food I could find was performatrin large breed senior it has low phosphorus. Hese been on it two months. He hates the food and ingredients are crap. Does anyone have any recommendations on a non prescription low phosphorus and or protein diet they would recommend. I can not do raw or home cooked. He use to be on grain free kibble.