DogDay is a minor character introduced in Poppy Playtime Chapter 3: Deep Sleep. He is the leader of the Smiling Friends.

DogDay is an anthropomorphic canine, characterized by an orange fur that complements his expressive black eyes, floppy ears, and sleek black nose. His features extend to a sunshine-yellow outer mouth and belly, while a touch of Golden-Brown graces his paws, ears, and the left side of his face. In line with other Smiling Critters, DogDay sports a perpetual wide toothless grin, his inner mouth shrouded in mysterious darkness. A distinct black zipper gracefully traces down his center, showcasing a captivating gold sun pendant surrounded by radiant orange sun rays.

The Bigger Bodies version of DogDay takes on a ragged, monstrous appearance. Completely bisected at the waist, all that remains of DogDay is a thin dilapidated torso stained with blood and held together with a tan leather belt likely to keep the remains of his innards from falling out. He has large black stitches connecting both arms to his body which end in two massive human-like hands, and like CatNap, his black pupils have white irises. Also like CatNap, he possesses large black sockets with no discernable eyes (until possessed by Mini Smiling Critters), and a large gaping mouth with no semblance of teeth.

DogDay’s cartoon appearance is roughly the same as his toy appearance, albeit with his zipper line removed, the addition of white pupils, and the zipper pendant now attached to a black necklace.