I think the biggest reason no one has even thought about hitting our house is the 70 lb poodle I have sitting in the front yard. When most people think "poodle" they think of the little 5 - 10 lb versions that sit in your lap. Make no mistake, ours would love to be a lap dog too, but having a standard poodle sitting in your lab is a bit much. Think "poodle on steroids" or just google it and you'll see what I mean.
Since moving to the country after retiring from the military, we've always had at least on poodle here on guard in the front yard. At one time we had two, a male and a female. Jet black fur, all you saw of them at night if you were a bad guy was eyeballs and teeth. <grin>
Having a really big dog in the front yard can sometimes deter someone looking for an easy mark. Just my $.02 worth on the subject.
And if they can get past the dog, like BF said "If some dude walked in my house I would not hesitate to pull the trigger."