They’re a cartoon dog and cat from the book series. Mother goose and Grimm Grimmy: an oddly colored Bull Terrier who belongs to Mother Goose though she often refers to him a kid or child. he's far less of a Jerkass and is usually portrayed as well-meaning or even heroic, even if he tends to make a mess of things. Atilla is A purple cat who lives with Grimmy and Mother Goose. Attila is far less mean than Grimmy, and he can almost come across as the dog's punching bag on occasion...