Which is best protection against burglary or thief from enter your home.

[Purplegrasshopper]

A trained guard dog is best.

Gun won't help if you're not home.

Alarm systems take too long to respond to. Statistics show that thieves are in the home 3-5 mins, that's all. I have ADT, and there's no way they could respond that fast. Also, alarms can be disabled. But now-a-days you can get ones that even if you kill the power and land line; they will use cell phone technology with battery back up to call the response center.

Another thing to consider, which is what I did is install a loud (and I mean LOUD) alarm in your attic. What you do is buy and install motion sensors, which aren't too expensive. Wire those to a loud bell/alarm (think old school fire alarms or that episode of Home Improvement when they install their home alarm system). My alarm is so loud, my entire street can hear it when it goes off. No joke.

No thief is gonna stick around with that thing going off, guaranteed.