Nitro is a Boston Terrier dog, Nitro narrates this story and claims dogs are not from this planet. He says dogs are kept in dog yards, neck chains and harnesses on earth. All dogs all did something wrong on their planet Niko, known as the planet of lost tails. Nitro has to serve his time on earth in Penrose Colorado and look for his own tail that he lost when another dog took it from a tail closet on planet Niko when he yelled dog catcher.He has to find his own tail by smelling other dogs. If a dog is missing or dies they are probably looking for their own tail. He returns back to his own planet when he dies on earth. Good for hospice patients too.