Rebel bites when I even think about getting on his back. If I reach up to take a hold on his mane he throws his head around and bites. I've been giving him a quick swat on the nose when he does it but it just irritates him more. I've tried putting my foot in the stirrup until he relaxes and taking it out as a reward for relaxing, but that's not working either. I've been doing this since I rescued him last spring and its not working. I had my trainer tell me one thing about smacking him: "It's either going to make him stop, or he's just going to do it faster."
She promised to help me with it, but I'd like to hear from you guys too. :)