One more reason to have a couple of dogs. Years ago, a friend of mine, who is a paraplegic, was at home, and asleep. His dog, a Rottweiler, was in bed with him on the second floor of the house (He has an elevator). He heard glass break off in the distance, it didn't sound like it even came from his house, but it did, two teenagers broke the glass out next to his front door, and just opened up deadbolt by reaching inside. My friend could feel the air change when the door opened, so he knew someone had opened the door. The dog was still asleep, he always slept very soundly. My friend got his gun out of the drawer, a Browning BDA .380, and then shook the dog awake. All he had to say was "Who's there?", and the dog started sniffing the air and went into alert mode. Almost at the same exact instant, one of the kids pops up in the doorway, and the dog went after him. The house has been remodeled for handicap access, and the bathroom has two doors. The dog chased him into the bathroom, slid on the tile floor, and crashed into the walk in shower. The kid closed the rear door, and the dog was barking and trying to get through that door, when the kid closed the other one, trapping him inside the bathroom. The phone line had been cut, and my friend learned never to let your cell phone's battery go dead, so he couldn't call anyone. The kid came to the doorway again, and said, " Give us your money, and we won't hurt you!". My friend said, "I'll give you a bullet!" The kid freaked as he didn't expect a man to be there, they had seen his mother going in and out, and thought she lived there alone. He yelled to the other kid, "There's a guy upstairs and he's got a gun!", the other kid comes up and walks into my friends' bedroom, and my friend yelled "STOP!", and the kid tossed a hammer at him, and they take off. After my friend let the dog out of the bathroom (He really tore it up trying to get out), the dog went through the house, looking for the kid who locked him in the bathroom, but he was gone. One of the neighbors was getting up to go to work and saw the kids drive away in an old S-10 Chevy pickup, and as it went down the street, he got a good look at the primered paint job on the bed. When he saw the lights come on at my friend's house, he realized something was up, and he went over to see what was going on. He told the police about the truck. The police also found a couple drops of blood from when they broke the window, and when they arrested two kids in an old S-10 a couple of hours later, one of them had a cut on his hand, and confessed when told they had blood and would run his DNA, so he folded up. The other kid was hard core, and he ended up getting 5 years out of it, and the one who bled got to go to the local jail for 6 months.
I have two dogs, littermates, one can sleep through anything, but the other one hears and reacts to any noise that she doesn't expect, from a quick walk around the house, to a full blown "RED ALERT" barking fit. She probably doesn't have the guts to attack an intruder herself, but her brother does, and once he's awake, an invader who would hang around with both of them barking is pretty stupid. Someone broke one of my windows a couple years ago. I didn't hear it, and my male dog didn't either, but the female did, and she went off the deep end. The bad guy never got all the way in, and he cut himself on the glass slightly when he started to come inside and had to bail out. They never caught him, but his DNA came back as a match when he was arrested after attacking his ex-girlfriend's fiancee outside a bar a year later. He ended up getting 7 years for the attack, and he agreed to that sentence to avoid being charged with a bunch of break ins and burglaries on top of the assault.