5. Saint Bernard: massive and challenging
The Saint Bernard is one of the largest dog breeds, weighing as much as 180 pounds. Their size alone makes them challenging for anyone with limited space. You'll also need a sizable food budget to keep up with the dog's ample appetite. Saint Bernards are not especially aggressive but do need a firm hand, or they can become unruly. Their protective instinct also causes them to bark at any disturbance.
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