Smile Dog, also known as Smile.jpg, is a long-running internet creepypasta centered on a photograph of a grinning dog that is said to haunt anyone who sees it. The image spread through forums and horror story sites, becoming a shorthand for unsettling, cursed pictures in online horror culture. Short jumpscare versions like this one strip the story down to a single moment of sudden suspense, which is why editors reuse it for pranks, horror shorts and reaction clips rather than for telling the full legend.