The mastiff is one of the largest breeds of low-maintenance dogs. They can weigh as much as 220 pounds are generally lazy and docile. They're a fairly healthy breed and require minimal exercise because they're low energy and do not have a lot of endurance. One downside to their size is they have a shorter lifespan than other dogs. Many do not live beyond 11 years old or so and become even lazier and more docile with age.

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