The gastrointestinal tract includes the esophagus, stomach, small intestine, large intestine, and colon. Therefore, gastrointestinal disease is defined as any abnormality involving one or more of these structures. By feeding your pet a diet that contains precise amounts of key nutrients, you can: •Help minimize vomiting, diarrhea,or constipation. •Help to support and improve the function of the gastrointestinal structures. •Maintain or improve appetite.Royal Canin