Scooby-Dum

Scooby-Dum is an animated cartoon dog created by Hanna-Barbera Productions, who appeared in four episodes of the ABC Saturday morning cartoon series Scooby-Doo between 1976 and 1978.

About
Scooby-Dum, a grey Great Dane with spots, buck teeth, and a generally dim-witted demeanor, is Scooby-Doo's cousin. Dum lives with Ma and Pa Skillet in the Okefenokee swamp of southern Georgia. Whenever Doo and Dum greet each other, Scooby-Doo yells, "Scooby-Dum" and Scooby-Dum says, "Scooby, doobie, doo." They then do a special handshake involving two high fives. Whenever he heard the word "Clue", he would invariably pull out a magnifying glass and, intoning the opening four notes of Beethoven's Fifth Symphony, chant "Dum dum Dum DUM!" The character of Scooby-Dum was partially derived from that of Mortimer Snerd, one of comedian/ventriloquist Edgar Bergen's popular radio and puppet characters.

Dum made his first appearance during the Scooby-Doo half of The Scooby-Doo/Dynomutt Hour on September 25, 1976, in an episode entitled "The Gruesome Game Of The Gator Ghoul". In this episode, Scoobies Doo and Dum, and the Mystery Inc. gang of Fred, Daphne, Velma, and Shaggy, help solve a mystery involving an alligator monster who is trying to put an end to the Skillets' production of their popular "Finokey Fizz" soft drink.

Dum appeared in one more 1976 episode of Scooby-Doo, "The Headless Horseman of Halloween", which first aired on October 9, 1976. He made two appearances in 1977, when The Scooby-Doo/Dynomutt Hour was expanded into Scooby's All-Star Laff-a-Lympics: "Vampire Bats and Scaredy Cats" on September 17, 1977, and "The Chiller Diller Movie Theater" (also featuring Doo and Dum's female cousin Scooby-Dee) on October 1, 1977. Dum also appears in all of the Laff-a-Lympics segments of Scooby's All-Star Laff-A-Lympics as a member of the "Scooby Doobies" team.