Breed: Great Dane
Original Appearances: The Scooby-Doo Show, 1976-1978.
Other Appearances: Laff-A-Lympics (1977). He may have also appeared in some merchandising.
Biography: I believe Scooby-Dum was the first of Scooby-Doo's relatives presented in the program, although what relative he is remains unclear! In most instances, he's referred to as Scooby's cousin, although in one show he's identified as Scooby's brother. Dum lives with Ma and Pa Skillet in the Okefenokee Swamp of Southern Georgia. When he hears the word “clue,” he pulls out a magnifying glass and chants the first four notes of Beethoven's Fifth Symphony.
Powers: Scooby-Dum has the ability to speak, like Scooby-Doo does, although without the “speech impediment” of starting every word with an “r” sound.
Group Affiliation: Ally to Mystery, Inc.
Miscellaneous: Obviously, at this point Scooby was being considered as the family name, with Doo being the individual's name. At least, it would've been if anyone had been thinking of doing anything but coming up with “Dum” to imply that he's stupid! All other relatives of Scooby-Doo's have had “Doo” as the family name. I suppose it's possible that both dogs were named “Scoobert,” nicknamed “Scooby,” with parents that were related, one with the family name of “Doo” (Dum's mother) and the other “Dum,” but perhaps I'm overthinking it.