One commenter said the Chihuahua's joyful expression made their "heart cry happy tears" because she looks so grateful to be loved.

Newsweek spoke to the shelter’s director, who said Billie “smiles so big” whenever someone comes to visit her.

Anybody who owns a dog knows that their dog has the cutest smile in the world. (Somehow every dog in the world has the cutest smile in the world, it’s just a law of the universe.) Which is why it’s so ...

Dogs can absolutely look like they’re smiling. You’ll see that open mouth, relaxed lips, maybe a little tongue, and... The ...

A smile can be so contagious. You know how hard it is not to yawn after seeing someone else do it, so just imagine keeping a straight face when someone is smiling hard right at you. When someone is ...

Sometimes smiling can be tough. Sometimes it's raining outside, you're running on three hours of sleep, you can't find your keys, your commute was heinous, Starbucks is out of pumpkin spice lattes, ...