Mommy, Daddy, Cassie, and Baby Louie welcome Marley, a lovable puppy, into their home. But Marley doesn???t stay a pint-sized pup for long. He grows and grows, and the bigger Marley gets, the bigger trouble he gets into. Big, bad-boy trouble. Will this family have to find a new home for their misbehaving pooch, or will he prove he can be a good boy?