Benson, a three-legged mastiff, lives alone in a quiet house. He spends his days contentedly watching the world through his living room window. One day a mysterious dog arrives at his doorstep and quickly makes himself at home, much to Benson’s surprise. Glad to have the company, they spend their days together watching through the window until more and more dogs arrive at their doorstep. Who are these mysterious house guests and where could they be coming from?