good luck at the vets later today. one of mine kept chewing at the bars and the only way to stop him was to put him in next doors run with some other males it was a nervy moment but they accepted him and now Harvey does'nt do it anymore, he also found a way to climb the bars to get over he was one determined pig, but ever since he is happy and has'nt done it since so maybe this time he did know better then me, he is now in with Ginger an older piggy and bertie, a year old and peace is blissful lol, apart form finding out why he chews the bars there is'nt much you can do, believe me over the years I have tried all sorts, Alfie even got terrible sores on his lips from doing it and i had to use genetian violet to cure it I had a multi coloured pig for weeks, lol let us know what happens and make sure you ask why it happened,