Just the basics for security - don't keep valuables or anything visible in the car, make sure the exterior of your house is well-lighted on all exposed sides, get an alarm system AND TEST IT frequently (to prove to anyone lurking that you do, in fact, have more than a sign you can get on eBay), make sure it isn't too easy to get into your windows (ex. big bushes in front of them can hide a person, and a trellis next to an upstairs window, etc.)...I think there are a lot of books and websites about this, actually.
A large dog may not deter all robbers, but it will deter some by making your house look less appealing than the house next door that doesn't have a dog.
Mainly I'd say concentrate on your personal safety and trust your insurance company to worry about the rest. They might even have resources to help make your home less attractive to burglars.