My horse cannot for the life of her get the left lead. Would you think hocks, stifles, or something else. She struggled with it over a year ago but not to this degree. The past 9-10 months she has gotten it 99.9% and could easily do simple changes right to left without a fuss. (We've never asked for flying changes.) She seems pretty unhappy to work to the left in general but will do it. When asking for the left lead she will counter bend and put her nose to the rail and pick up the wrong lead every time. She just is very against bending and putting her nose inward going that direction. No limping so short striding. Flexion test were all negative. I guess xrays are next on the list but just seeing if anyone has experienced this. As I said when we got this horse she only got this lead about 50% of the time then this past year she has been perfect with it. She even offered a flying change to the left lead over a jump. But the past 4 days it is just not there. Tried putting a ground pole down and tried the corners and even in a circle she just throws herself to the right lead.