Spoiler warning: Plot or ending details follow.

Good-Sized Horse is a side quest in The Legend of Zelda: Breath of the Wild. It is given to Link by Zyle, who can be found at Gerudo Canyon.

He asks to be brought a horse. It can be one that has already been registered at a stable, or still wild, but either way, the player will not be able to get the horse back. Only regular horses are accepted, but the quest-giver has unique dialogue when refusing a Giant Horse (which is too big), a Stalhorse (which is too scary), or others (any of which are "not a horse", including the Lord of the Mountain).

Spoiler warning: Spoilers end here.