When does Dog City return?

Dog City is an animated television series that was produced by Nelvana Limited and Jim Henson Productions. The series ran for three seasons, airing on Fox Kids from September 26, 1992, to November 26, 1994; in Canada, the series aired on YTV until 2000. Dog City was spawned following an hour-long live-action television film, titled Dog City: The Movie, which was created for an episode of The Jim Henson Hour in 1989, with the cast created for the film incorporated into the series.
Dog City focuses on the lives of various anthromorphic dogs and cats that reside in two different worlds. The stories themselves focus on animator Eliot Shag and his cartoon creation canine private investigator Ace Hart. Each episode focuses on Elliot creating new animated stories featuring Ace for a television program named after the character.