This is what I call the 'new horse - new house syndrome'.
He is among a new 'herd' (you and him) and he is trying to achieve the highest point he can on the new pecking order. It is your place to explain to him in a language he understands (horse herd 'talk') that you are FAR ABOVE him in the pecking order at your house. You are always supposed to be the 'head pecker' - no pun intended, of course.
Since you would get your head kicked off for biting a hunk out of his arse, even if you could, you have to settle for spanking it.
You should take the end of the lead-rope or a 5 foot stock whip and spank his butt with it until he turns and faces you. Then, take all pressure off by backing up a step and just stand there for a minute. Then, approach him again and hopefully he will keep his head turned toward you this time. If he does, just catch him and go on like nothing has happened. If he turns his butt again, spank him harder and repeat the whole process again until he decides turning his butt is bad for his health.
Please DO NOT hit him with your hand or a riding crop. It could get you kicked in the head. If he is trying out his would-be authority, he may also kick hard and may even kick 2 or 3 times -- especially if he got you to 'back off' at any time before this.
Many horses will 'check out the pecking order' when they come to a new place and are handled by different people that they have not yet learned to respect. You should always be ready to show them that you are on the top of his new pecking order. They, more often than not, will try something.
Last edited by Cherie; 04-04-2011 at 04:34 PM.
Reason: add a word