Outside of Whiterun on the western side of the plateau that the town sits on is a small cavern with some bandits. after you kill them and another wave of them that comes soon after you'll find a horse beside a carriage that it looks like they stole. Upon inspecting the horse you'll see that it says to "steal horse" but the horse has no aparent owner. I took it and rode it around and dismounted it in front of guards and re mounted it in front of them even though it still said to steal it. My question is, is there a way to lift the stolen flag from the horse and make it recognize you as its master? Because when i get off of it it begins to wonder away ( i think back to the cavern).