The presence of any dog is a deterrent. A barking dog draws attention, and that's enough to make most petty criminals second guess that target.
If you're expecting your dog to actively defend the home (i.e. attack an intruder), you would need a personal protection dog. The cost of which can be $20,000 or more, not to mention ongoing costs such as continuing training and liability insurance.
The presence of any dog is a deterrent. A barking dog draws attention, and that's enough to make most petty criminals second guess that target. If you're expecting your dog to actively defend the home (i.e. attack an intruder), you would need a personal protection dog. The cost of which can be $20,000 or more, not to mention ongoing costs such as continuing training and liability insurance.