The truth is that the Old English Mastiff is probably "too much dog" for the average household. 15 Dog Breeds That Have the Longest Lifespan 1 Chihuahua 15-20 Years. They are relatively large, as a result of being a mastiff mix, around 25 to 29 inches. Though rare, there are more mastiff dogs than presented in this list. The oldest Chihuahua on record 2, Megabyte, died at the age of 20 years and 265 days. 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. The breed can have a life span beyond its average life expectancy. ... Bullmastiff… 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 Australian Cattle Dog is known for having one of the longest life expectancies. Best Mastiff Dog Breeds. The Pitbull Mastiff also goes by these other names as: Bullmastiff Pitbull Mix Get your Mastiff accustomed to regular grooming sessions. Here are 10 purebreds who live an average of 7 to 9.5 years. What dog breed has the shortest lifespan? Average life expectancy is about eight to 10 years. Life Expectancy. Utilize the opportunity to check for rashes, infections, inflammation or any other indications that might further aggravate. Does a dog’s size help determine how long he'll live? Chihuahuas are normally referred to as the breed with the longest lifespan. Pitbull Mastiff Mix is a cross of a Pitbull and a Mastiff, also known as Pit Mastiff or American Masti-Bull. The lifespan of an Old English Mastiff is very short – less than 10 years. They average 15-20 years and are one of the smallest dog breeds. The lifespan of a Mastiff Pitbull mix is between 8 to 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) A healthy Mastiff Pitbull mix has a lifespan of up to 8 and 12 years. Large dogs have shorter lifespans than medium and small-sized dogs. Overall, the Mastiff may not be suitable for a first-time dog owner. History: The bullmastiff was developed during the mid-19th century by British gamekeepers to protect country estates from poachers. Since it is a big dog, a Bullmastiff has an average life expectancy of 8 to 10 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. They also are known for snoring. 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