Hybrid Origin: The Mastador is a hybrid between the Labrador Retriever and the Mastiff. Erroneous Alias: Masador Country of Origin: Mastadors originate in the United States of America. Original Purpose: The Mastador is a great family companion. Breed Characteristics: Mastadors are a great dog for the entire family but should be supervised with young children as they are large and excitable. Mastadors are very friendly dogs that make great companions. Mastadors are well built, muscular, lean dogs with a deep chest. Mastadors require daily exercise and are not well suited for apartment living. Life Expectancy: Average life expectancy for the Mastador is 10 - 13 years.