Which breed of dog has the longest life expectancy? Which breed has the shortest?

Here is a table of 94 breeds with average life expectancies. It covers the most familiar ones, and a lot of less commonly-recognised ones. Individuals can vary significantly from the breed average, though. A general summary is that the smaller they are, the longer they live.

The longest average life expectancy here is the New Guinea singing dog, at 18 years. It is followed by the Chihuahua (17), Toy Poodle, Jack Russell Terrier and Cockapoo (all 16).

The shortest life expectancies on the list are large dogs: Dogue de Bordeaux (5-7 years), Irish Wolfhound (5-7), Bernese Mountain Dog (6-9), Great Dane (7-10).

https://www.petcarerx.com/article/lifespan-of-a-dog-a-dog-years-chart-by-breed/1223