I have a 6 year old 81 pound lab/retriever mix and a 10 year old 24 pound mix breed and am looking for a food that will work for both. I currently feed them Natural Balance Reduced Calorie, but my lab has loose stools often and can’t eat any other brand treats without distress. I like the smaller size kibble, easy for the little guy to eat. Can you recommend a food that will work for both size dogs and improve the digestion results? thanks for your help!