Exactly what the others above me said. My new guy, has been doing the same thing, or really I had been doing the same thing. We love our new guys, and want to be really really nice to them so they can have that great bond with us but the horse is looking for a leader, and if we cant be that then they will assume the rule. I've been standing straighter and doing what I want to do with him, I'm still gentle and loving with him. My boy is a big baby, only 2 and half, and was very under weight when i got him, not that he getting healthier he has a lot more energy and had become quite the divo. I started leading him around but only letting him stop when i want him to, if he stops pn his own then I make him turn in a circle and eventually he decides to do what i want. This is a good way to gain his respect in hand. Good luck, and I look forward to reading updates since we are sort of in the same boat. My boy is also believed to be a standardbred although no one knows for sure, just lots of opinions leading that way.