I think that presence is more important to deter human intrusion than a gun. If you aren't home, it won't matter if you have a gun. Dogs help, and so do visible cameras. A thief who is looking for a few bucks to score some drugs is looking for soft targets. Things sitting outside are more likely to go missing, gas cans, RE batteries - assuming you keep those outside -, copper pipes, wires, etc. Anyone who comes into your house while you are at home is a whole other category of intruder. Dogs help. My dogs let me know when anyone gets too close to the property. They wouldn't hurt anyone. They'd be as likely to run from an intruder as anything else, but folks don't know that.
I have a shotgun, long rifle, and a revolver. I spent twenty years in the Navy, so am comfortable around firearms. The shotgun was a gift, the rifle was to help me get my marksmanship scores up for work. I had some wild dogs come at me once, so picked up the revolver because I don't like to look like I'm on patrol when taking a walk around the property. I don't like to kill things, so hopefully the sound will be sufficient to deter the buggers should I see them again. We also have coyotes on the property that get pretty brave at times, going through trash, and worrying my animals.
I did have a frank discussion with the people who were suspected of doing most of the thieving around here. I explained, in no uncertain terms, my stance on crime and firearms, as well as the castle doctrine as it applies in our state. I haven't had many of the problems that some of my neighbors have with things turning up missing. I'd much rather people think I'm trigger happy than that they make a poor decision regarding unauthorized entry into my home.