Gerbil Nibbles At Dog's Tongue Every Time The Dog Licks His Face

To be honest, we have never owned a gerbil so we have never even had the opportunity for this kind of behavior to be normal. Is it? No clue. To be honest, though, we have never seen a dog just hold its mouth open like this before. It's very odd. The black Labrador is holding his mouth open and kind of licking at the gerbil. Meanwhile, the gerbil nibbles and bites and licks at the dog's open mouth. Maybe this dog likes to have really clean front teeth and his gerbil friend is his personal dental hygienist. Who knows, these two have a relationship that has no description.