When changing the staple food of the dog, it is taboo to change it all at once. Changing the food without adapting to it can easily cause gastrointestinal discomfort to the dog. Furthermore, different foods have different nutritional components, which makes it easy for the dog to change at the beginning. Symptoms of diarrhea and loose stools occur. It is recommended that the owner add new food to the original food and gradually add new things, so that the dog can adapt to the change of food and will not suffer from discomfort.