Install an alarm system (& CCTV) or do actively train a dog to guard the house properly.
One of the best deterrents for would be thieves is to have an operational alarm system as thieves are left guessing, real or not! Though some do not set their alarm, we advise you to set it as a matter of precaution.
Training a dog to guard your house will assist in keeping thieves away. A dog barking ferociously will help you in the hour of need.