Stomach Ulcers Molly Powell explains what stomach ulcers are and the easiest ways to prevent them. By H&R Editors | August 11, 2021 Click here to watch now! Stomach ulcers are common in performance horses and something that should be treated as soon as possible. The stress of competition and travel makes barrel racing horses prime candidates for ulcers so Molly explains how to prevent them. Click here to watch now!