Get one of those motion sensor lights... & use crazy bright lights!!

I also found that getting a sign that says "Warning Guard Dog", works sooooo much!!!

Back home people kept trying to break into our yard, luckly I was home with the dog & scared them away... After the 3rd time, not only did I let my pissed off dog into the yard (they were in the driveway trying to open the gate) & watched them nearly poop them selves.. I printed off guard dog signs with an APT picture on it & put one on the porch, the driveway window & the back door.. NEVER had an issue after that.