Teaching a dog to smile isn't one of the classics ... Credit: Mashable Original image has been replaced. Credit: Mashable Back on Reddit, the reactions to this smiling Dalmatian were just as ...

This indicated that the angry faces caused the most powerful emotional reaction in the dogs. Under the influence of oxytocin, however, images of smiling faces enhanced the dogs' emotional state ...

She's obsessed!" "She's waiting so politely," posted a third commenter. A stock image of a brown dog smiling on its back. A video of a pup that looks similar has left internet viewers in hysterics.

Unfortunately for many dogs ... cute pictures on Instagram are anything to go by. The pit bull mix pooch has settled in well to his home, and two years on, he still can’t stop smiling.

A dog owner from the United Kingdom shared her pup's reaction to being told he is loved ... At that point, his facial expression morphs into a big smile that goes from ear to ear.

Snapshot of the dog being adopted. The video shows a dog standing at a desk, smiling brightly ... Updates on Trending News Viral News, Video, Photos and Weather Updates of India and around ...

The image is taken the Reddit video shows ... A few also pointed how the dog’s polite reaction left them smiling. “It looks like the dog is trying to work out what’s happening and why ...