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Though a gentle giant, the Bullmastiff was originally bred to stand guard. He's very obedient, but he will exert his power if he senses that his family is in trouble. These dogs are the perfect balance of toughness and devotion, and are great companions both in and out of the house. And here are eight Bullmastiffs that proved they had their owners' backs:

1. He starts his day out right — a Cup-o-Joe with his best friend always prepares him for morning lookout duty.


A photo posted by Rob Keefe (@keeferob) on Feb 20, 2016 at 6:29am PST


2. And when on duty watching over his family, he takes it as seriously. Checking out the situation from all sides is absolutely necessary.


A video posted by Jeremy Foss (@jeremyfoss87) on Feb 18, 2016 at 10:17am PST


3. And even while playing around, he still keeps an eye on his owner and the surroundings.


4. But serious guard-dog duties don't stop him from playing around.


A video posted by Martin Spittler (@piercing_huber) on Feb 18, 2016 at 2:28pm PST


5. But when he knows he's needed and will come through. Easily overcoming obstacles in his way.


6. Even mounds of snow…


A photo posted by chikkimok (@chikkimok) on Feb 22, 2016 at 2:31am PST


7. And surprise attacks.


A photo posted by @lovebarklife on Aug 1, 2015 at 2:11pm PDT


8. Just as long as he can relax with you when he's off duty. But don't worry, he'll still keep an eye out.
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