He's a little cow-hocked but not too badly. However, he does turn out pretty severly in his lower legs on both of his hinds. You see how he's a little turned in going down to the hocks (but not that badly) and after the hocks he turns out more? It seems to be the worst after the fetlocks and more so on the right side. I don't think that would cause the problem you're experiencing, but I wouldn't be surprised if he has an arthritis issue (maybe long term caused by the conformation) that has started to act up and is now causing the difference.