2. Get a Dog
Any dog can help alert you to the presence of an intruder on your property. Thus, even a King Charles Spaniel can provide you with the benefit of early detection.
A large dog will provide the benefit of intimidation. Even an untrained guard dog may have instincts for running off an unknown intruder, especially if they get the sense that their owner is tense (which is a given during a crisis).
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Watch dogs, such as a Chihuahua or a German Shepard has a strong bark that will let a trespasser know that he’s being watched. An actual guard dog, such as a Chow Chow or a Doberman, will keep an trespassers attention and give you the element of surprise.