 The 100-dog survey yielded a mean longevity of 13.41 years with a standard deviation of 2.36 years.The study concluded that while Australian Cattle Dogs are a healthy breed and do live on average almost a year longer than most dogs of other breeds in the same weight class, record ages such as Bluey's or Chilla's should be regarded as uncharacteristic exceptions rather than as indicators of common exceptional longevity for the entire breed.A random-bred dog (also known as a mongrel or a mutt) has an average life expectancy of 13.2 years in the Western world.