Bowdrie's horse

He was lean, rawboned and irritable, yet Bowdrie had developed an affection for him. Pet the roan and he would try to bite you. Curry him and he'd kick. But on a trail he would go all day and all night with a sort of ugly determination. Bowdrie had never known a horse with so much personality, and all of it bad.

(from McNelly Knows a Ranger, by Louis Lamour)