You know that face your dog makes, the one that’s a little bit quizzical, maybe a bit sad, a bit anticipatory, with the eyebrows slanted? Sometimes you think it says, “Don’t be sad. I can help.” Other times it quite clearly asks, “No salami for me?”

Scientists have not yet been able to translate the look, but they have given it a very serious label: “AU101: inner eyebrow raise.” And a team of evolutionary psychologists and anatomists reported Monday in Proceedings of the National Academy of Sciences that dogs make this face more often and way more intensely than wolves. In fact dogs, but not wolves, have a specific muscle that helps raise those brows.

Here’s an example of the look in a talking-dog video that nearly 200 million people have watched online. Watch for the twitch up of the inner eyebrow at 15 seconds.