The story of how a stray dog, Pluto, comes out of nowhere and impacts the Davis family, who are struggling in many ways. In just a short time, Pluto the Wonderdog manages to save a toddler, bring comfort and companionship to a hurting 9-year-old boy, help restore a marriage, and repair a broken father-son relationship. Pluto is not only a guard dog - he is a guardian angel.