11/11/11 - What will occur? What DID occur?

[Monica]

That reminded me of something. I've always wondered how baring one's teeth became a sign of friendliness. Seems like for most animals that is a clear sign to stay back.

Cats and dogs have opposite body language. A cat twitches his tail when antagonized, whereas a dog wags his tail when happy. But yes, both bare their teeth when threatened, though dogs do smile.