The Mastiff is considered a breed with a short lifespan, but some Mastiffs have lived to 18 years of age.
When Mastiffs reach adulthood and overcome their clumsiness and energy, they are wonderful companions who are calm, quiet, well mannered, and self-assured.
The modern mastiff has somewhat lost the wildness of irascibility, but due to its colossal potential, it remains the most powerful fighting dog in the world.