I live out in the country, and if someone broke in here, they must be mad or stupid. We have 6 farm dogs, all related, and the biggest is the grand dad. He is a rottweiler x German Shepherd, bred for the police force.
He used to go to work with my OH, and sleep in the back of the Landy. One day, some men came round wanting to buy scrap. OH was a bit suspicious and worried they would come back later. They heard the dog in the landy, and peered in the back window. One said OMG - he has a head the size of a football. OH said yes, he runs loose at night. Men said I bet you don't have anyone troubling you, and left!!!
There was a spate of burgleries a while back near here, and they were targetting isolated farms, taking quads and vehicles. They have not been here, maybe the dogs put them off, or they realise we do not have anything worth taking.