Which large farm animal is physically unable to vomit?

Hints

It's an animal that can sleep standing up.
In chess, it's the piece that moves in an L-shape and is often called a knight.
Its baby is called a foal, and it wears shoes on its hooves.

Reveal the answer

Answer: Horse

Also accepted: horses

Horses have a very strong band of muscle at the entrance to their stomach that acts like a one-way valve, so food can go down but can't come back up. Their stomach also sits in a position that makes vomiting nearly impossible. That's why vets take stomach problems in horses so seriously: a horse can't get rid of something bad by throwing it up.

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