My dog was eating and my little brother went up to pat him which took the dog by surprise and before anyone could stop what was happening my dog instinctively bit at my brother and got him in the lip! He bit a bit of the lip off and swallowed it which means the doctors can't sew it back on. Because of this he had to have plastic surgery to replace the bit that was gone. He's back home now but his lip still needs time to heal.