Ace Yu is the hero of Dog City, the Muppet special that aired as part of episode 104 of The Jim Henson Hour. He was raised by Mr. and Mrs. Howe Yu, and has a pink bow in the Pickanese art of "Whyioughta."

He had a cameo in "The Secrets of the Muppets" at the OMD.

The Ace Yu puppet was later reworked into Eliot Shag for the Dog City television series (the puppet was modified to have live hands instead of sticks). He was also the inspiration for Eliot's animated alter ego, Ace Hart.