Your boy is overreaching, OK. Have his farrier roll his toes on the hind hooves. I think with over exuberate play, ie: the pasture even in the stall….they do get creative at times. The bell boots are a good thing. My guy occasionally over reaches in play rather than work sessions. So try the rolling of the toes. Also as he becomes more balances and knows where his feet are…he should do this less and less. You may have to put shoes on him too, depending on your farrier so the toes can be rolled. Rolling the toes will cause him to break over a little quicker. Its not a bad thing.