Sad dog is a funny image of a dog, that shows the true nature of the breed. This dog photo displays the dog's true instincts and his interactions with his surroundings. Sad dog black and white boston terrier. Play and solve Sad dog puzzle with 12, 24, 35, 40, 54, 60, 70, 96, 104 or 260 pieces. This online jigsaw puzzle, is the perfect way to relax. Or create your own puzzles from photos.