Rufus

Rufus is a fluffy white dog originally built for 1968's Hey Cinderella special. He doesn't talk, but uses mime gestures to communicacte (very much like Sprocket from Fraggle Rock.

He also appears in The Muppets Valentine Show, and on Sesame Street in 1969.

By the time The Muppet Show came around, Rufus was given more realistic features (so that he could also be switched to a real dog when the camera switches) and renamed Muppy, owned by J.P. Gross.

Though converted into Muppy, both Rufus and Muppy can be spotted in the wedding scene in The Muppets Take Manhattan.

He was originally played by Frank Oz, then Dave Goelz when he became Muppy.