Over 30% burglars said would avoid a house with a dog inside based on a University of North Carolina Study. To make this work for you, you need to either have a dog or create the illusion that there is a dog on your property. A trained guard dog preferred. Some tips:

• Have an especially loud and/or vicious dog. 
• Dogs can also be trained not to take food bait.
• You can add beware of dog signs and leave outdoor 'proof' such as a dog bowl and dog chain at the front or back door to encourage a burglar to look elsewhere regardless if you have a dog or not!
• Here’s a list of The 10 Best Guard Dog Breeds 
• Some information on How To Train a Guard Dog