I went on vacation for a week last month, and I told my stable that they could use Remington in a couple of lessons. A rider went to get on him and he bolted and she came off and hit the wall. He does this with me also, but now I really need to get this problem taken care of. He stands very well when you get on, but as soon as you get onto his back, he bolts.
I don't know how to train him not to do this, I would be very greatful if you guys could give me some suggestions.