Dogs smile by pulling one or both lips back and may show all or some teeth. This smiling is accompanied by other greeting behavior, like approaching, wagging or even whining.

Seeing a smile from your dog will likely turn your own frown upside down. But what are dogs trying to tell you when they smile? We've got the answer.

It could be, humans, we smile with our teeth without, and dogs do the same. There's some dogs that may never smile with their teeth, and there's some dogs that do smile. James Brown: ...

Yes, it’s normal for dogs to bare their teeth when they smile. The bigger problem is that people often misinterpret a toothy smile as aggression and become scared, Haug says.

Dogs may seem like they're smiling, but are they really? Here's what a veterinary behavior specialist says about dogs smiling with and without teeth.