Life span: 12 to 15 years
Pugs are prone to respiratory issues and overheating, but other than that, they have few major genetic problems.
Bonus Breed: The New Guinea singing dog is an exception to the “small dog = long life” equation. That’s because the rare New Guinea singing dog (also known as a “bush dingo”) is a medium-sized dog with a maximum height of 18 inches and a maximum weight of 31 pounds. The life expectancy of this breed? An impressive 20 years. The reason this breed doesn’t appear on many lists is because this is technically considered a wild dog.