While we were riding down the road, my mare kicked the snot out of a neighbor's dog one time. The whole side of his head swelled up and it looked awful - but it was just nasty bruising and the dog was healed up after a couple of weeks. Neighbor was furious and called the sheriff out, thinking I would be in trouble. He got a ticket for violating the state leash law. Ticket was only $50, but it was enough to get his attention. He kept his dog up after that.
It's funny, because the leash law isn't usually enforced out our way - guess the obnoxious guy really ticked the deputy off.