Do dogs smile? It sure looks like they sometimes do to me. I really don't have a good photo of Willow smiling but this kind of shows her with a grin. She will show her teeth and the corners of her mouth turn up. In the photo it looks like she has an overbite but she really doesn't. Most of the time you can't see her teeth. It's only when she is really contented, or when she is considering being mischievous.