By day, Arthur is a mild-mannered museum guard; by night, his alter ego, Art Dog, is a mysterious artist who makes the city his canvas. However, when Leonardo Dog Vinci’s Mona Woofa goes missing from the Dogopolis Museum of Art, Art Dog is a prime suspect. Not to be deterred, the canine superhero simply paints his way out of a jail and collars the thieves with his brush strokes. While the town applauds his heroism and celebrates his artistic brilliance, the only thing still at large is Art Dog’s true identity.