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About what share of adult horses have stomach ulcers, according to Merck?

Ulcers show up in roughly 30 percent of adult horses.

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  1. About 1 percent
  2. About 30 percent ✔
  3. About 95 percent

Why: Merck says ulcers can be found in approximately 30 percent of adult horses, and in up to 90 percent of racehorses. Stress, housing changes and illness are linked to them.

Huh, didn't know that: A horse's stomach secretes hydrochloric acid continuously, Merck says.

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References

Answer: About 30 percent. Merck says ulcers can be found in approximately 30 percent of adult horses, and in up to 90 percent of racehorses. Stress, housing changes and illness are linked to them.

  1. Stomach (Gastric) Ulcers in Horses (Merck Veterinary Manual) www.merckvetmanual.com/horse-owners/digestive-disorders-of-horses/stomach-gastric-ulcers-in-horses
    Ulcers can be found in approximately 30% of adult horses.
    Checked 2026-10-10.
  2. Stomach (Gastric) Ulcers in Horses (Merck Veterinary Manual) www.merckvetmanual.com/horse-owners/digestive-disorders-of-horses/stomach-gastric-ulcers-in-horses
    Horses' stomachs secrete hydrochloric acid continuously.
    Checked 2026-10-10.
  3. Stomach ulcers in horses (UMN Extension) extension.umn.edu/node/31786
    The best way to diagnose gastric ulcers is by flexible endoscopy of the stomach.
    Checked 2026-10-10.

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