I'm sorry, are you trying to join the forum? If so, you'll have to tell us a little bit about yourself. There's a sample intro sticky in this forum.
If you're just looking for info on the poor chi's bite, I don't think anyone can help you. From the photo, it doesn't even really look like a bite. Assuming it is a bite, which makes sense, I think the vet would be the one best equipped to offer an opinion on the source.