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Flat-faced dogs, large dogs, and male dogs typically live shorter lives, the scientists discovered. Breeds that live longest, over 14.5 years, are Lancashire heelers, Tibetan spaniels, and Shiba Inus.

The study, however, did not aim to rank different dog breeds. "The purpose of the study was really to understand how dog breeds differ from each other in each of the studied traits," Junttila said.