|What's missing, Scoobypedia?|
He looks like a hairy man.
He acts dog-like, except when he is struck by the light of a full moon, which caused him to morph into a fearsome wolf-monster.
Shaggy & Scooby-Doo Get A Clue!
He is one of the monsters that got out of the movie when the techies were testing it. Phibes thought he was just annoying until Rusty's wolf transformation made him run for his life. (Super Scary Movie Night)