Simple. If your working with him carry a dressage (long) whip in your pocket. If he so much as crinkles his nose he gets a hard whack and yell "hey!". It has to be hard enough to mean something so the memory sticks. If you tap him with it your probably just going to tick him off more. One swift whack, then go back to what your doing.
If he threatens to kick you, ie moving his butt toward you, lifting a legs, kicking the air, tail swishing, etc make him think that he is about to DIE. Use your whip, a bucket, your shoe, back him, let him bump his butt into things (safe things, stall door, split rail fence), shake the lead. If you do it right he is going to say "whoa, better NEVER do that again". Then just go right back to what your doing with him.
Make sure when your around him he is ALWAYS on his best behavior. Little habits can snowball into big ones. Mouthiness to biting. Kicking out at the air turns to kicking a human. Expect nothing but good behavior from him. Don't let him get away with rubbing his head on you and biting then discipline him for kicking. Keep everything the same across the board.
Practice moving him out of your space. Make use you can easily move his hindend, shoulders, back and forward out of your space. All I have to do is say "move over" or "over" and sometimes touch her with my finger and she scoots over. If she doesn't listen I grab a cotton lead and lightly reinforce what she knows.
Make sure what your doing isn't causing your horse pain. Check to see if his back is sore by running your fingers on either side about two inches away from his spine. Run them over his hips and all the way to the base of his tail. I don't think its an acceptable thing for a horse to kick out when they.are in pain, but its worth a check.
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