He is indirectly mentioned by Petey in Dog Man: The Scarlet Shedder. Despite only being a relative to Petey, Li'l Petey, and Grace, he is referred to as "Grampa" by everyone in the series, except for Petey, who calls him "Dad."

Mr. "Grampa" TheCat, also briefly known as Crud or as his "superhero" alter-ego Sprinkles, is the overarching antagonist of the Dog Man franchise. He is Petey the Cat 's abusive and selfish father who abandoned Petey and his mother, Grace, when the former was very young.

Petey the Cat is the main antagonist (for the first four books) turned deuteragonist (alongside his son, Li'l Petey) of the Dog Man series. His first appearance was seen in Super Diaper Baby 2: The Invasion of the Potty Snatchers which was declared canon in Dog Man: Mothering Heights.

Li'l Petey (also known as the Cat Kid/The Firecracker Kid), is one of the two deuteragonists (alongside his father Petey) of the Dog Man series, and the main protagonist of Cat Kid Comic Club. He is a smart yet naïve orange kitten.

Petey's father (also known as Grampa, or Crud in Dog Man: Grime and Punishment) is one of the two overarching antagonists (alongside Rip Van Tinkle) of the Dog Man franchise. He is Petey the Cat’s abusive and selfish father, abandoning Petey and his mother and is …

"Grampa" TheCat is the secondary antagonist of the Dog Man movie. He is the elderly and abusive father of Petey and the husband of a presumably deceased Grace who abandoned the two of them when Petey was merely young.

Mr. "Grampa" TheCat, also temporarily known as Crud or as his superhero alter-ego Sprinkles, is the overarching antagonist of the Dog Man franchise. He is the abusive and corrupt father of Petey the Cat and the indirect reason he turned evil

Grime and Punishment took Petey's issues with his dad up to eleven by revealing that his father not only abandoned him when he was young, but around the time that his mother had gotten sick. Petey: Look — your Grampa... He ABANDONED me and my mom! He left when I was just a kitten! He left when… He left when my mom was sick.

Grampa is the overarching antagonist from the book franchise Dog Man by Dav Pilkey and its 2025 animated film adaptation. He is Petey's estranged father and Lil' Petey's grandfather. He is voiced by Stephen Root.

Grampa is Petey’s dad. Unlike Petey, Grampa is a static character; he fulfills the role of the story’s villain; he remains villainous throughout the series and this storyline. Grampa left Petey and Petey’s mom when Petey was a child.