Calvin Waffle doesn't believe in bad ideas Danny knows his friend Calvin has crazy ideas, so he's not surprised when Calvin suggests they start a Rent-a-Pet business. After all, Calvin's Aunt Ruth wants the boys to watch her dog while she's away, and what better way to get the miniature Collie off their hands than loaning him to a kid in the neighborhood for a few days? But in order to rent a pet, you need a renter...