Once more, you need to find out why your horse is kicking. Another common reason is aggression. If you find that the horse either doesn’t like the horse in the stall next to him, or across the aisle, or he wants to get out and teach that horse passing by a lesson, then try the method below. I suggest you do not punish your horse for this display of temper. He has nothing else to do. The best remedy for this is to put him in a pen with other horses and let them sort out their differences. Horses are born to fight out their social order. If he isn’t allowed to do this he begins to feel very insecure. At least when he knows his place, be it top or bottom of the pecking order, he knows who he is subordinate to and who he can boss around and this makes him much more comfortable with his surroundings. Every horse needs to know his place.
Aggression toward humans is a more serious problem. As with the horses in the method above, he needs to know his place among his ‘herd’ of humans, and this knowledge does not enter his brain through beatings! The way to deal with this is a technique called round-penning. However, if done improperly, this can cause serious damage to the horse either physically or mentally. I do not at this time feel qualified to explain how this works, as I am figuring it out myself right now by trial and error. I am beginning to get a good grasp on it, but not good enough to teach about it just yet. I suggest you find a trainer, such as myself, to help you and your horse work through this problem.