A couple dogs might help, if you know what you are doing.

You can escalate security measures right up to fort knox level. Ultimately, it is going to depend on what resources (money) you have to work with. There's tons of information on the web. If you have the money, you can even hire a consultant.

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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)