So theres this shetland pony that I like to help 'train' with my neighbor, and he gets bored, really easily. When we bring him in to groom, (he lives in a pasture, so he's ALWAYS dirty) we tie him up. He stands for about a minute, then starts to move (which is a pain when you're trying to pick his hooves or fit splint boots) so I had to crosstie him, loosely at first, since he doesnt have much experience with crosstying. Then he starts chewing the crossties, and I tighten it so he can't move his head, to either side. What can we do to keep him to stand still!! I would rather just tie him, but he chews either the rope or me! (he gets a smack for chewing on people, and the rope) what should we do?????