Very true...I just never thought, until it was said, about the claustrophobia, that could cause and issue. I haven't had Halo long enough, to know about spooking yet. I've seen her spook once, but her spook wasn't to flee, but just more a startle, head up thing. Yes, I have a long time, before I even get there. I'm thinking I may not even get to ground driving, until she is around 3, which is a whole other year. Just depends on how far along we are in our relationship. Not going to rush it. Want to do obstacles first. I can see where a horse, that has had an accident, could be a problem. They probably never forget.