I own a 13.0 hand high pony that I have been contesting for about 5 years. He has recently started rubbing his hocks on barrels in his turnout, on his water buckets and on his stall walls. I make sure to brush him daily and he does not appear to have any insect problem. I was wondering if he is starting to develop a hock problem. He has no heat in his hocks, but he does switch on and off resting his back legs. Does the rubbing of the hocks mean anything? I also gave him MSM and it seemed to help him move a lot smoother. I am just not sure because there is no heat or swelling. I also have been putting a poultice on them every time I work him hard. What is your opinion? I will have the vet out too, I just want to know what you think.