(Average human life expectancy in Japan is 83.1 years and the dog breed Akita has an average lifespan of 12) If you own a Rottweiler in The United States, then your dog’s 1 year equals your 8.7 years (Average human life expectancy in the US is 78.74 years and the dog breed Rottweiler has an average lifespan of 9 years) Large dogs have shorter lifespans than medium and small-sized dogs. They also are known for snoring. A healthy Mastiff Pitbull mix has a lifespan of up to 8 and 12 years. The Australian Cattle Dog is known for having one of the longest life expectancies. And an alarming number of Mastiffs are crippled by bone and joint diseases and/or succumb to cancer at only 6 or 8 years old. Overall, the Mastiff may not be suitable for a first-time dog owner. Get your Mastiff accustomed to regular grooming sessions. 15 Dog Breeds That Have the Longest Lifespan 1 Chihuahua 15-20 Years. Pitbull Mastiff Mix is a cross of a Pitbull and a Mastiff, also known as Pit Mastiff or American Masti-Bull. Chihuahuas are normally referred to as the breed with the longest lifespan. The Pitbull Mastiff also goes by these other names as: Bullmastiff Pitbull Mix Though rare, there are more mastiff dogs than presented in this list. Knowing that some health issues will reduce the dog’s lifespan, keeping them healthy and fit is paramount. They average 15-20 years and are one of the smallest dog breeds. Since it is a big dog, a Bullmastiff has an average life expectancy of 8 to 10 years. The Chihuahua is the smallest dog in the world and are fiercely loyal when it comes to their owners. The lifespan of a Mastiff Pitbull mix is between 8 to 12 years. The Bullmastiff is a large-sized breed of domestic dog, with a solid build and a short muzzle.The Bullmastiff is a mastiff type dog, and was originally developed by 19th-century gamekeepers to guard estates. Does a dog’s size help determine how long he'll live? Large dogs have shorter lifespans than medium and small-sized dogs. The breed was created by crossing the English Mastiff with the now extinct Old English Bulldog.It was recognized as a purebred dog by the English Kennel Club in 1924. What dog breed has the shortest lifespan? The truth is that the Old English Mastiff is probably "too much dog" for the average household. They are relatively large, as a result of being a mastiff mix, around 25 to 29 inches. Utilize the opportunity to check for rashes, infections, inflammation or any other indications that might further aggravate. As is true with most very large breeds, the bullmastiff doesn't live as long as smaller dogs do. The breed can have a life span beyond its average life expectancy. Best Mastiff Dog Breeds. Life Expectancy. Here are 10 purebreds who live an average of 7 to 9.5 years. 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