Man's best friend turns out to be a family nightmare. The story centers around a suburban family and the harrowing experiences they endure from a possessed dog they innocently adopt. A household pet is conveniently killed, only to be replaced by a new dog, who turns out to be evil incarnate. Mysterious accidents claim the lives of those who suspect the dog's true nature. Betty Barry and her two children fall under the dog's spell, until father and husband Mike gets some useful advice from an Ecuadorian shaman, which helps him send the beast back to hell.