Its not a party trick, one of our sows is only walking on her front 'elbows' but using back leggs normally if that makes sense. She started yesterday morning after being moved to a new paddock. I washed her trotters and had a good look for injuries, swelling or stiffness but she seemed fine. Yesterday afternoon she was back up on all four trotters as usual butthismorning was crawling around again. Any ideas what's wrong or what else I could try?