I have noticed that when my girl Cali bumps into things around the house or while out playing, the area swells up pretty fast. Even when she only bumps into it a little bit.. Like if she turns around real fast in the hallway while trying to keep up with me and might clip a table leg or something and its usually in her jaw area that swells up pretty quickly. Is this a normal sheltie thing? I have noticed it in the past and it never seems to bother her and will go away in a day or two so I was just curious if anybody else has come across this? We were just outside playing frisbee and she turned her head on the disc just a bit too late and it struck her in what seemed to be the side of her face and now she has a big knot kinda on the side but under her bottom jaw. My poor girl seems to be the biggest klutz sometimes!