So I had my firrer come out and do my horses hooves. And when he was doing my 4 year old he would lean on him and try to get him to drop his hoof and (hes 16.2hh and is probley 1400 pounds) just be a butt, this isnt the first time he's done his feet but this is the first time he's done this. He really good when I pick his feet he's fine and lets me even when he's not tied and in the pasture. Any reason for this? Anyway to prevent him from doing it again?