The Fire Pony
It is the best book I have read!
Young orphaned Roy and his arsonist adult brother, Joe Dilly, are heading West, fleeing an earlier arson scene and looking for work on a horse ranch. At the Bar None, they find a place where they can avoid the law and earn their keep. Roy can also earn a pony, if he can break her. Lady is a beautiful, wild palomino that has already stolen his heart, but even if she lets him ride her, he worries that Joe Dilly's uncontrollable emotions and fascination with fire will destroy all of his hopes and force them to move on yet again.