We should realise the limitations of dogs for security. They can be a very effective and useful part of a security system, but on their own they do not magically and instantly make us safe. We need to factor in our whole lifestyle, and the possible threats to us and our family. Developing a multi-layered approach and having wide-ranging and well-drilled procedures should be the base, and the dog must integrate with all the other components. There are no guarantees- not even for professionals with millions of dollars of funding and sophisticated training behind them. In one instance, an intruder in the grounds of the White House was beating up the Secret Service malinois, until agents jumped on him and subdued him. In another instance, an ex-military combat veteran managed to get past the dogs by creeping through thick bushes, and was apprehended only after triggering an electronic alarm INSIDE the White House! :o