This article originally appeared on USA TODAY: Can dogs smile? Here's what your pet is trying to tell you with that sweet smirk. Reporter Clare Mulroy's dog Star smiling for her family.© Clare Mulroy ...

And then, of course, there’s the comments sections on each of these videos. People are loving these videos, adding to the silliness by trolling creators in the comments, saying things such as “omg you ...

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

Dogs may also smile when they’re feeling guilty, or when you’re trying to get them to do something they don’t want to do, like take a bath. If they give you a submissive grin when they’ve done ...