Gastric ulcers associated with the squamous tissue of the stomach are termed Squamous gastric ulcers. The squamous tissue is located in the upper region of the stomach and is not buffered or protected from the harmful acid secretions in the stomach. Ulcers associated with the squamous tissue are the most common ulcers in the equine stomach. Ulcers associated with the Glandular region of the stomach are ulcers in the lower portion of the stomach. These are less common in horses since this area of the digestive system is mostly protected from the harmful effects of stomach acid.