Petey was Dr. Dilbert Dinkle's evil sidekick in Super Diaper Baby 2: The Invasion Of The Potty Snatchers until Petey betrayed him. He also appears as the main antagonist if the Dog Man novels, until his alleged redemption in Lord of the Fleas.
He is an orange cat with black stripes across his body, pointy ears, long whiskers and a dotted nose.
- Super Diaper Baby 2: The Invasion Of The Potty Snatchers
- Captain Underpants and the Terrifying Return of Tippy Tinkletrousers - The Adventures of Dog Man
- Dog Man (book)
- Dog Man: Unleashed
- Dog Man: A Tale of Two Kitties
- Dog Man: and Cat Kid
Petey is nasty and teasing. He often picked on Dr. Dilbert and made fun of his plans. Then he betrayed him and tried to destroy the world with Dilbert's Mecha-Kitty robot.