I'll go to put the saddle on and then bring the girth over his belly and he pins his ears back as far as he and and raises head, and tries to bite me. Even if I just touch it with my hand...and he doesn't have the saddle on. Is this bad? Can I do anything about it? I've had him for three years and he's 13 years old, ever since I got him he was like this but it just never seemed to get any better. And whenever we would have the vet come over he would say he's a healthy horse?