Baby horses, just like baby people, explore their world with their mouth. Biting is a part of that testing out their environment. ... It can be playful and harmless when they are small, but mother horse knows to put a stop to excessive rough play while a foal is learning its boundaries.

How do you get a yearling to stop biting?

You just have to avoid getting bitten, learn to keep yourself out of his reach so that he can't bite you. Ignore him when he does bite. When leading him, hold the lead rope up under his chin so you have more control of his head. They grow out of it.

Why does my horse want to bite me?

Horse Biting Out of Discomfort or Agitation

Your horse may bite you if they are uncomfortable because of a saddle that doesn't fit or a girth that is too tight. Biting can be a sign that your horse is trying to protect themselves or that they are intimidated by a situation.