My big guy stands with his right hind leg rotated to the outside and either back or forward of the other leg most of the time. He is short in the trot and canter on that leg. He has now begun to avoid picking up right lead canter (which should be indicative of something going on in left hind so it just confuses me more). He also does not want to go down hills or slopes when hacking out. He is on pasture with hills 24/7. I have tried Adequan, fetlock and hock injections, joint supplements, back injections as result of lameness exams. (We never got past the fetlocks and hocks since he flexed positive in those). Just wondering if it could be a stifle or SI issue. Any thoughts?