Can dogs really smile? The editors of The Bark decided to find out by launching a smiling dog contest at a reader’s request eight years ago – and have since received thousands of photos of pups that not only smile, but laugh, grin and even appear to share jokes with one another.

Over 400 of the best photographs from The Bark’s collection now reside in a book called DogJoy: The Happiest Dogs in the Universe. And we’ve got five copies to give away to the first five Dog Blog readers to respond to this post with a valid e-mail address (just so we can contact you for an address to send the book to.)

See more smiling dogs from DogJoy below!