|This needs a stretch. (Feel to remove when satisfied of completion.)|
The Scooby-Doo werewolf was Scooby-Doo after being dosed with a wolfsbane formula.
The Scooby & Scrappy Doo Puppy Hour
He only remained a werewolf in direct full moonlight. If the full moon was behind a cloud or he was inside away from a window he reverted to normal. As a werewolf, Scooby was wild, violent, and super-strong. He had no memory of his actions as a werewolf when he returned to normal. Scrappy-Doo and Shaggy were eventually able to mix up a formula to cure him.