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Beaver (Jerry Mathers) and Wally (Tony Dow) are pressed into service as baby-sitter when their next-door neighbors go out of town. Well, actually, their not baby-sitters, they're kind of pet-sitters, since their charge is the Donaldson's cat, Puff Puff. Unfortunately, the boys let the cat out of the bag when Eddie Haskell's dog, Wolf, chases Puff Puff away to parts unknown! This was the final episode of Leave It to Beaver's first season, and the last one to be telecast on CBS.