Ace hart is a German Shepherd Private Eye, in the traditional gumshoe mold. Working alone, or in an uneasy alliance with Police Chief Rosie O'Gravy, he tackles the underworld of Dog City in case after case. There is a twist, though. He is also the creation of animator Eliot Shag (a muppet German Shepherd animator), who takes the events in his own life as inspiration for Ace's adventures. Though the show is predominantly 2D animation it does have 'live' muppet sequences, sometimes involving Eliot interacting with Ace via his storyboards.