Lightning and Thunder, two three-year-old puppies, and their masters, Gabe and Alex Zanadu, are transported in a dream to the house next door with cats Salt and Pepper and their two owners, Sylvia and Penelope. After settling in to the back yard, Penelope, the youngest girl, takes them up to the attic for a secret party, which turns into a dressing contest for the dogs and cats. Lightning, however, get's distracted by a scratching sound...