These guys have the shortest lifespans.
The tallest (as high as 38″) dog breed lives the shortest life (rarely more than 10 years, averaging passing away at only age 7.) Irish wolfhounds are quite, loyal dogs with a deep love for people. They tend to develop cancer.
BERNESE MOUNTAIN DOG
Originally from Switzerland, Bernese mountain dogs were effective herders for Bernese farmers. They make loving pets for both adults and children. They tend to suffer from cancer and typically live to 7 or 8 years, never more than 10.
These long-legged, tall, lean bodied dogs live to 7 to 10 years. Very friendly and affectionate, they grow to bond especially well to other dogs when socialized early. Commonly Great Danes succumb to bloat, hip dysplasia and congenital heart diseases.
BORDEAUX MASTIFF or FRENCH MASTIFF
These beautiful dogs with the distinctive red coat typically only live to 5 or 6 years old. They are the oldest breed in France, being traced back to the 14th century. French Mastiffs tend to develop genetic heart problems.
These massive dogs come from Italy. They have loose, floppy skin folds that cover their entire body. Neapolitan Mastiffs weigh 160 to 200 pounds. They are fiercely protective of their family and need to be socialized early to accept strangers and other pets. Neapolitan Mastiffs tend not to have strong immune systems, can suffer from thyroid disease, bloat, heart disease and various joint dysplasia. They tend to only live between 7 to 9 years.