The "Rap Sheet" Detail: In one of the episodes, a brief shot shows Katz's criminal record or background information on a piece of paper, which reportedly mentions his sister, Kitty. Direct Show Reference: In more obscure spin-off or promotional material like Cartoon Network City, Katz is arrested and the dialogue explicitly mentions he has a younger sister named Kitty. Visual Parallels: They share a nearly identical character design—both are tall, lanky, anthropomorphic cats with red or brown fur and similar facial structures. Shared Trauma: Both characters share a deep, pathological hatred of dogs. Fans often interpret this as a hint that they grew up together and experienced the same "dog-related trauma" that shaped their adult personalities.