Hi, I was wondering if anyone can help me....when you pull my ponies hind leg backward her hock goes further back and her leg appears straight which looks strange to how a normal horses leg looks in this position. My pony is walking, trotting and cantering ok....she even jumped a rather large pool of water in the field with no signs of pain. When moving the leg up under her belly or backwards she doesnt show any signs of pain.....its a mystery?? Can you solve it???