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 appeared as the main antagonist of 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 (his first appearance)
- Captain Underpants and the Terrifying Return of Tippy Tinkletrousers - The Adventures of Dog Man (his first defeat by Dog Man)
- Dog Man (book)
- Dog Man: Unleashed
- Dog Man: A Tale of Two Kitties
- Dog Man: and Cat Kid
- Dog Man: Lord of the Fleas (his conversion)
- Dog Man: Brawl of the Wild
- Dog Man 7
Prior to Lord of the Fleas, Petey was nasty and teasing. He often picked on Dr. Dilbert and made fun of his plans (and breath.) Then he betrayed him and tried to destroy the world with Dilbert's Mecha-Kitty robot. He also disliked Dog Man, a referance to cat & dog rivalries. When Super Diaper Baby and Diaper Dog took him to jail, he was excited at first, but whenever he got arrested thanks to Dog Man, he, almost every time, ends up saying “Rats!”
Petey could get very annoyed by his clone, L’il Petey at times, like when he calls him “Papa,” which always ended up in him reminding L’il Petey that he is “NOT YOUR PAPA!” And L’il Petey’s jokes counted as well, like jokes about poop and diarrhoea, which, any way possible, was absolute nonsense.
In Lord of the Fleas, L’il Petey told Petey to change his ways and be good. Now he has a deep heart for the kitten, and finally accepts being call Papa (although he still gets annoyed by his jokes.) but as proven by a hard time with Big Jim, he is still trying to learn to be as good as Dog Man.