Hey guys, thanks for all the advice. What I'm gonna do is call the owner again and ask if he's had any recent vet checks on the horse and if he does then I want to see the papers next time I come up.

I don't have my "own" vet parsay, and the horse vet here would not drive three hours just to check out one horse.

But I had a horse expert with me and she didn't see anything wrong with him. Here is another pic where he wasn't like that:
Just in case though I am going to email my cousin (who knows horses better than anyone I know, and see what she thinks)

That's dirt on him by the way.