So the shelter I rescued my cat told me to feed him purine pne urinary tract health for a healthy cat. He started having diarrhea. Took him to a real vet the checked his stool and said he was fine. He was wondering why we fed him with purine one urinary. We didn't thibk it could have been the food. He started his chiken and rice diet and there was no more diarrhea. We started feeding him his regular food and the diarrhea came back so we think its the purine brand. My question is what's the best brand I should use to feed him. Price is not a problem. Thanks