The oldest Chihuahua on record 2, Megabyte, died at the age of 20 years and 265 days. As is true with most very large breeds, the bullmastiff doesn't live as long as smaller dogs do. They also are known for snoring. Utilize the opportunity to check for rashes, infections, inflammation or any other indications that might further aggravate. The lifespan of a Mastiff Pitbull mix is between 8 to 12 years. Large dogs have shorter lifespans than medium and small-sized dogs. Knowing that some health issues will reduce the dog’s lifespan, keeping them healthy and fit is paramount. History: The bullmastiff was developed during the mid-19th century by British gamekeepers to protect country estates from poachers. A healthy Mastiff Pitbull mix has a lifespan of up to 8 and 12 years. (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) 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. Since it is a big dog, a Bullmastiff has an average life expectancy of 8 to 10 years. They average 15-20 years and are one of the smallest dog breeds. The Chihuahua is the smallest dog in the world and are fiercely loyal when it comes to their owners. 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. Here are 10 purebreds who live an average of 7 to 9.5 years. 15 Dog Breeds That Have the Longest Lifespan 1 Chihuahua 15-20 Years. The lifespan of an Old English Mastiff is very short – less than 10 years. ... Bullmastiff… The breed can have a life span beyond its average life expectancy. Best Mastiff Dog Breeds. What dog breed has the shortest lifespan? Pitbull Mastiff Mix is a cross of a Pitbull and a Mastiff, also known as Pit Mastiff or American Masti-Bull. Large dogs have shorter lifespans than medium and small-sized dogs. Life Expectancy. The truth is that the Old English Mastiff is probably "too much dog" for the average household. Does a dog’s size help determine how long he'll live? Average life expectancy is about eight to 10 years. 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. 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