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Nasty-Doo was the "Were-Doo" disguise of Professor Digby. He based it on the real Nasty Doo.
Nasty-Doo is a werewolf with brown fur and yellow eyes with red pupils. He wore a red spiked collar.
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A Pup Named Scooby-Doo
Digby was digging for a missing leg bone in Doo Manor so he could be famous, and he dressed up as Nasty-Doo to cover his tracks. (The Were-Doo of Doo Manor)