Check out the anti-theft system I have for mine...
My friend who is a mechanic has a large piece of property. He has a pond on his land also, and sometimes hunters come by, sometimes young folks come by to drink and screw, etc. One time, he had a thief. They guy was trying to break into one of his car trailers. He owns 2 German Sheppard dogs.
The thief took one look and saw the light.