In his stall, he'll reach out and bite any passing horse, he actual bit my mare once and apparently bit someone's saddle. In the field he's of course bossy, always moving the other horses feet whenever he can. I'm planning on taking a chair and my camera and just watching them for a while. Under saddle he cut's other horses off, it's like to his rider; F you, I have to go tell this horse off.
The thing is though, is that she's done the Clinton Anderson Beginner (and maybe Intermediate) stuff, and he does it to a T. Yielding hind quarter, giving at the poll (I was actually in the field, walked up to him and asked him to give and he was perfect, then proceeded, as soon as I walked away, to bite a horse.) and backing up, one day she backed him up all around the ring. I'm planning on free lounging him to see how he does with that.
Also, he hates the gelding next to him and vice versa. Every time one walks by the other's stall, the other will reach out and bite. Yesterday we spent some time just walking Chance by the other horse. If they made angry faces Chance would get a "Oui, listen to me." shake on the lead and the other horse would get a tap with a crop my friend was holding. If they bit it was a smack for both. The other horse isn't even dominate though.
So, any idea how I can get this horse to let his handler/rider be the boss, all of the time? It's just like he'll go back and forth between "your the boss" and "I'm the boss" despite her efforts of moving his feet and doing what normally create that "I'm the leader, your the follower" with the horse. Any help/advice/tips/trick/exercises are appreciated!