A Harvard psychologist has shared what she believes dogs dream about on a night - and it'll likely put a smile on your face if you're a dog owner or simple an animal lover ...

Oh, sweet Lotti. To be a girl in the big, confusing world is too real. This is a sly smile that could win anyone over, maybe even bring cat people to the dog side — and she doesn't even know it!

Bitsy the rescue dog has a winning smile but it hasn't earned her a home yet. The pit bull mix arrived at the City of Arlington, Texas Animal Services on April 22 after an eventful day as a stray.

Seeing a smile from your dog will likely turn your own frown upside down. But what are dogs trying to tell you when they smile? We've got the answer.

Watch a video of a smiling dog – it should do the trick. You could go for the dog smiling as his owner takes a selfie or the one where the owner is training their puppy to smile on cue.