train german shepherd attack

How to train a dog to be a watchdog?
Hello, I have a German shepherd and 8 months is too sweet. I want to learn not leave strangers in our backyard (where you live). How can I train to be a watchdog? I do not want to attack, but only the crust and intimidate anyone who wants to enter
That is not something to teach a dog! Learn to protect your property with time on his own! If you love him and treat him well, his greatest thrill in life is to protect you and your belongings! Why not place lives at home with you? Do you have a shelter and a warm nest to sleep? Do you have toys and cold drink water at all times? Did you give him attention or are simply left outside your password?
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