My 4 year old arabianxwarmblood gelding has started recently having a popping sound when he walks and trots. We started training around October, and there was no sound when we started. I have been doing research and found that backing up and hill work are good for it (and I have been doing a lot of it). Through the research, I found that it can get to the point that the horse's leg locks up. Nothing that severe has happened, but I don't want to get to the point where it does. Is there any supplements that I could feed him so that we can maintain the state he is at, or make his condition better?