Loose stools is a common occurrence if any new food is introduced to a pet as it takes about 1 week for your pet to get accustomed to the new food. Please try to follow the switching guide as propose on our feeding guide: 75% existing new food: 25% new food 50% existing new food: 50% new food 25% existing new food: 75% new food 0% existing new food: 100% new food