Both Charlie and Sadie are on Purina One Sensitive Stomach. Both have done well with the food. Charlie has a sensitive stomach and is prone to loose stool. He poo has firmed up for the most part, and I'm glad that both of mine are pooping 2 times a day now (or less). Sadie doesn't have stomach issues, but she did have an outbreak of acne that I'm thinking may have been food related. Before this, we fed Solid Gold Mmellinia.