Hi there, first thing I would do is get a bag of Fromms pork and peas and switch him to that, there's no transition time with the 4 star grain free line. We had to do that with Buster, we switched from the beef to the pork and peas and his allergies cleared up and if you aren't doing it already I would start giving him a teaspoon of yogurt every morning for breakfast it acts as a probiotic.. We also started a daily routine of wiping out his facial folds and wrinkle with Duoxo pads twice a day and that's whats really helped keep the tear stains away, got them off Amazon. Hope this helps.