Spank is the Larkin family dog. He is brown and white, and is rather short and plump. He is a mutt. He is very lazy and lies down a lot, and he also has a big appetite, and will eat anything that resembles food. Mrs. Weebles thinks he is smelly and accuses him of "urinating all over the place", however Spank has never actually urinated anywhere inappropriate. Andy describes Spank as being the fattest member of the Larkin clan, with himself being the second fattest.
(In the books, Andy had a dog named Sooty, but Sooty was more energetic than Spank).