Assuming there is no behavioral component to this, if a horse is reluctant to keep one hind leg up for hoof picking or for shoeing, what part of the leg is most likely causing the pain? My horse is only 9 years old, but is someone post legged and I have heard a little clicking back there in recent months. I'm suspecting a little arthritis might be starting the settle in. I don't want to just put him on an overall glucosamine supplement and hope for the best. Ideally I would like to target and treat the specific area. I'm thinking hock, but am not sure. Just curious if anyone had any ideas.