How To Be Guard Dogs

Question
Hi, I am the owner of two nine months old german shepherd sister pups. I got them at seven months,they're loving, energetic and alert, the problem is that they don't bark. I take them for walks but they're shy and a bit coward towards other dogs and extremely friendly toward humans. The purpose for which I bought them was to protect my home from intruders ......had a couple of break ins. Instead they fit in like children, they're a bit too playful.
What can I do to ?

Answer
Start by building their confidence.  Start with obedience training. The key to most behavior problems is approaching things using the dog's natural instincts. Dogs see all the people and dogs in the household as a pack with each having their own rank in the pack and a top dog. Life is much easier if the 2 legged pack members outrank the 4 legged ones. You can learn to play the role of top dog by reading some books or going to a good obedience class. A good obedience class or book is about you being top dog, not about rewarding standard commands with a treat. As you praise the dog for following your commands, it will build its confidence.

Play tug of war with the dog and lose. However at the end of the game, take the rope or toy and put it up, less the dog becomes confused about who is top dog. Ropes from the pets' store quickly turn to hazardous shreds. Ones I made lasted much better. Go to a hardware or home center that sells rope by the foot. Buy 2' of 3/4" poly rope. Melt the ends, and tie knots in it. Get them as tight as possible, put it in a vise and pound it with a hammer. Watch carefully, and be ready to discard when it comes apart.

Finally, make sure it has a den to live in. If you are not using a crate, buy one. The dog may be happier in its den than loose in the house. It relaxes, it feels safe in its den. It rests, the body slows down reducing the need for water and relieving its self. Dogs that have been crated all along do very well. Many of them will rest in their crates even when the door is open. I think the plastic ones give the dog more of a safe, enclosed den feeling. Metal ones can be put in a corner or covered with something the dog can't pull in and chew. Select a crate just big enough for the full grown dog to stretch out in.

A dog that has not been crated since it was little, may take some work. Start out just putting its toys and treats in the crate. Praise it for going in. Feed it in the crate. This is also an easy way to maintain order at feeding time for more than one dog.

Dogs tend to follow their owners lead.  The next time you see somebody you would have wanted them to alert you to, Get excited and shout.  They should pick up your activity and start barking.  Praise them for it.