Leave It to Beaver S03 E29 Beaver's Monkey

"Gee, Wally!"

Beaver wants a pet and when Ward and June object to his latest one, a mouse. They tell him they can have a sensible pet, so when Beaver and Larry see an ad at the market giving away a free monkey, Beaver jumps at the chance and Ward and June find their house the new home for Stanley, the Monkey.