The longest-lived dog on record was an Australian cattle dog named Bluey, who lived 29 years and 5 months. The second longest-lived dog was an American cocker spaniel named Butch, who lived to 27 years old. The current oldest living dog is a dachshund named Maggie, who is 26 years old. Small breeds of dogs tend to live longer than large breeds; the average lifespan of a small breed dog is 14 years, while the average lifespan of a large breed dog is 8 years.