Treat for Trigger is a term used to describe a type of diet for horses that suffer from gastric ulcers. This diet consists of OATS and HAY, which are both common ingredients in horse feed. OATS, which has four letters, is a cereal grain that is high in fiber and protein, while HAY, which has three letters, is a type of grass that is dried and used as a source of nutrition for horses. Both OATS and HAY are important components of the Treat for Trigger diet, as they help to reduce the symptoms of gastric ulcers.