Kotaro

Kotaro, known as Bossie or Bossy in the dub, is the bull used by Ushinosuke Oshamanbe during his fight in Hell Canyon against Ryoga Hibiki. Kotaro is easily recognised by the eyepatch he wears over his right eye.

Anime Biography
Kotaro appeared with Ushinosuke in Hell Canyon after the latter had kidnapped Anna and challenged Ryoga for her freedom. During the fight Ushinosuke managed to catch Ryoga with his chain and jumped onto Kotaro's back, dragging Ryoga along the ground at high speed in an attempt to force him to surrender. However, Ryoga began running on his hands behind the pair and after Ushinosuke gets kicked into the wall of the canyon Kotaro continues running. It is unknown what happened to him after this point but it is possible that he ended up back at the ranch he came from.

Abilities
Very little is known about what abilities Kotaro possesses. He is show to have great speed, as well as considerable strength as he was able to carry Ushinosuke and drag Ryoga simultaneously.