That's one of my questions... I guess he got an abcess back in the day on the race track (no big deal). He was xrayed and the only thing the paper work said was low palmer angles Posted via Mobile Device
My 5-yr old TB has the same problem. I have a full set of shoes on him with pads on the front, and he kept throwing shoes until we had the farrier put a new type of shoe on that grips on the sides kind of so if they step on it from behind it won't come off. He's just learning where to put his feet and his legs are TREMENDOUSLY long, so he's just getting used to where his feet go. I'll bet your horse has the same problem.
My guy is very knowledgeable, has been doing this for 30 some years, I herd nothing but good from people around here about him. I don't think he is the problem. We had pads on him last month till he got some growth going, I just hate not being able to ride, I put an easyboot on him but he is still out of balance!