Sprocket

Sprocket is Doc's pet sheepdog in the Jim Henson television series Fraggle Rock. Like his master, Sprocket spends much of his time in Doc's workshop, where his bed and food dish are, observing Doc at work. As a result, he often catches Gobo Fraggle in the act of retrieving a discarded postcard from Uncle Traveling Matt. Sprocket frequently tries to make Doc aware of the Fraggles, but his efforts are generally for naught.

Appearances in Christmas specials

 * "The Bells of Fraggle Rock"
 * A Muppet Family Christmas
 * The Muppet Christmas Carol