Doctor Dolittle decides to expand his zoo to include a home for crossbred dogs and a club for rodents. The Doctor's Zoo is unlike any other zoo in the world. In his zoo there are no cages; the animals stay there voluntarily and are free to leave whenever they want. While expanding the zoo the doctor takes some time to solve a mystery with the aid of Kling, the Dog Detective. Another wonder adventure with the greats veterinarian the world has ever known!