The Walkers are moving to a new town, and staying with an aunt who's allergic to dogs. Too bad for Andi and her brother Bruce, who love dogs -- and happen to meet a stray dog that needs help. Soon, Andi thinks of a plan, turning the abandoned house down the block into a hotel for dogs.

But as more and more "tenants" move in, the secret gets too big to keep. Can the kids save their canine castle? Or will the hotel have to close?