I have a very diligent & loud dog.
A few years ago my neighbor (across the street) asked me why I always let my dog bark at everything?
I promptly reminded him that I was the only one of his neighbors with a dog & also the only one (including him) never to be burglarized. The look on his face was priceless!
Along with my dog I've employed the 'Home Alone' effect.
You see my camper is sitting facing the entrance to my greenhouse. Well I've set it up to look like someone is inside.
1.The back door is opened & the screen door is closed. So you can't see in.
2.The radio is on low to a talk station. (several times while I've been in the greenhouse I would have sworn that someone had walked up my driveway, and it was the damn radio in the camper!)
3.A lump in the bed to look like someone sleeping.
4. pare of old boots outside the door.
5. And icing on the cake; about a 1/2 doz .45 shells laying around the ground.
That camper door is like looking into a bear cave, you 'just feel' like someone is watching you! Kinda eerie!
Just trying to make them a little 2 nervous to proceed.
Try setting up a pup ten & put a radio in it. It has quite an effect!