Motion lights around the building(s), and I'll add this to the aiming discussion - light up the foundation of your house so you, or the cops, can see if someone is lurking underneath your windows. Illuminate an area around your house. Don't bother illuminating the street like so many people do.

The idea of putting fencing on the ground to discourage digging is tried and true, but don't think you need to get the same expensive fencing that you used to go around your house - a decent grade chicken wire works just fine. See if you can bury it an inch or two so the animals won't see the edge and realize it stops.

Ground hogs won't fall for it though.