Two sisters at an orphanage find a puppy and hide it. When they are adopted by a couple at Central Park, they bring it secretly with them. Even in a big apartment, it's a problem hiding and feeding a growing Great Dane.

Two young girls from an orphanage are adopted by a family in New York. The only problem is the apartment they move to doesn't allow dogs. The girls try to sneak a puppy they find into the home and keep it hidden. Chestnut (a Great Dane) grows and grows while getting into more and more trouble.