When this woman is recording her daughter and pup, she asks the little girl to smile and gets an unexpected surprise. While the girl smiles and says "cheese", she's not the only one grinning. The adorable Collie dog is also showing his smiling teeth at the camera in this vintage footage from February 7, 1990. Dogs that are happy are said to have more looseness in their bodies, and thus, their corners of their mouth might point a bit higher. However, this dog seems to pull off a full grin, shiny white teeth included. It's believed that dogs don't smile just as humans do, but after seeing this dog's expression, many people might beg to differ.