Equine Ulcers… What Every Performance Horse Owner Should Know: ↓ • 50–90% of horses have gastric ulcers. Yes, the majority. • Performance horses are hit hardest — exercise ramps up acid production and cuts blood flow to the gut. • A horse’s stomach makes acid nonstop — 24/7 — pumping out up to 9 gallons a day, even on an empty stomach. • Symptoms can be subtle: mood changes, poorer performance, girthiness, reluctance to train, tooth grinding, belly discomfort. • Only one way to know for sure: ga