Wuffles is Howlin' Jack Talbot's canine companion, seen in The Muppet Show Comic Book: Muppet Mash Part 3.
Throughout the issue, Wuffles keeps entering the stage while Howlin' Jack suddenly exits, leaving the others to believe that Howlin' Jack keeps turning into a dog. Eventually, they learn that Howlin' Jack does turn into a dog, but that Wuffles is his companion.