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. A healthy Mastiff Pitbull mix has a lifespan of up to 8 and 12 years. They also are known for snoring. They average 15-20 years and are one of the smallest dog breeds. (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) Get your Mastiff accustomed to regular grooming sessions. The lifespan of an Old English Mastiff is very short – less than 10 years. Though rare, there are more mastiff dogs than presented in this list. Utilize the opportunity to check for rashes, infections, inflammation or any other indications that might further aggravate. Pitbull Mastiff Mix is a cross of a Pitbull and a Mastiff, also known as Pit Mastiff or American Masti-Bull. 15 Dog Breeds That Have the Longest Lifespan 1 Chihuahua 15-20 Years. History: The bullmastiff was developed during the mid-19th century by British gamekeepers to protect country estates from poachers. The truth is that the Old English Mastiff is probably "too much dog" for the average household. Chihuahuas are normally referred to as the breed with the longest lifespan. Overall, the Mastiff may not be suitable for a first-time dog owner. Here are 10 purebreds who live an average of 7 to 9.5 years. Large dogs have shorter lifespans than medium and small-sized dogs. What dog breed has the shortest lifespan? Large dogs have shorter lifespans than medium and small-sized dogs. Average life expectancy is about eight to 10 years. Life Expectancy. Since it is a big dog, a Bullmastiff has an average life expectancy of 8 to 10 years. Best Mastiff Dog Breeds. The lifespan of a Mastiff Pitbull mix is between 8 to 12 years. Knowing that some health issues will reduce the dog’s lifespan, keeping them healthy and fit is paramount. The Pitbull Mastiff also goes by these other names as: Bullmastiff Pitbull Mix ... Bullmastiff… The Bullmastiff isn’t quite as large as his close cousin the Mastiff.Still, standing as high as 27 inches at the shoulder and weighing between 100 and 130 pounds, this is still a whole lot of dog. Does a dog’s size help determine how long he'll live? 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. The oldest Chihuahua on record 2, Megabyte, died at the age of 20 years and 265 days. The Chihuahua is the smallest dog in the world and are fiercely loyal when it comes to their owners. As is true with most very large breeds, the bullmastiff doesn't live as long as smaller dogs do. 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