limping pigsI have two pigs, they live in a 1 acre pen. One morning when I went out to feed them my small white piglet was limping very badly and couldn't put her foot on the ground. I looked at her whole leg and the bottom of her hoof and she had no marks or nothing in it. about 2 days later my older pig started limpinng, she too had no marks on her leg or hoof! What is it and how can I help them stop limping?