I have always had a hard time picking up my Percheron's hooves, especially the hind feet. It sounds like classic draft horse stuff: legs like immovable posts; if I leaned on him to shift his weight, he leaned back harder. Once his feet are up in your hand he rests his weight in your hand and then often slams his foot down when he's had enough.
After two months of clicker training, he now picks them up willingly but honestly, it seems physically hard for him. I don't lean on him anymore, just ask, but he shifts his weight back and forth several times, picks up an easier foot, and seems to lose his balance frequently. How do I tell if it's still a behavior problem or a physical problem?