Time for my $.01. I've delt with two rescued German Shepherds in my short time, as well as many other breeds of dogs, and I simply love them. From my experience with 'rescued' dogs I would (sadly) avoid it, and get a puppy for the tasks you have stated.
We've rescued two german shepherds, and picked one out of the paper (note Moose).
Shepherd #1: Sassy, incredibly intelligent dog, perfect listener, excellent alarm dog. Garunteed to lick someone to death; but so well trained that you can put your finger on the ground, say lie here, and she puts her nose to it and stays their untill otherwise told. Perfect house dog. God I wish my parents would let me have her.
Shepherd #2: Moose, 90 odd pounds of stupidity. Chewed everything in sight and took quite a bit of training to get to a good state.
Shepherd #3: Angel, loyal gaurd dog. The first three days she was home, she wouldn't even let anyone within 10 feet of my mother without some serious warning. In time she came to love and protect everyone in the household, almost ended up with a lawsuit when someone decided to walk onto our property, but that's another story. She was a bit skitzy, and afraid of any sort of negativity. Even the slightest amount and her temperment towards you would be changed for around a week or more.
The reason I mentioned avoiding a rescued dog and getting a puppy is for several reasons: A dog you have raised from a puppy will most definately instill the loyalty you desire. Both of you will have to help train the dog. I would *not* reccomend a third party for training the dog, pick up a couple good books, keep a communication line to your breeder open, and you should be set. It's still a gamble, but you do have the current hosts word, the current rescuer is looking for a *permenant* home for the dog, an will not lie to you about its behavoir.
Other breed reccomendations: I have had limited exposure to Belgian shepherds, but every but of it impressed me. They are smaller than German shepherds, but are a bit more territorial (and protective) than a German shepherd is, even at times a bit excessive (imo). Though, if you're going to have limited contact at your home with the outside world, it may be perfect.
Note of caution: I would veer away from any mixed breeds, it's a gamble. The one dog I'm in regular contact with now that I'm on my own is a Husky/Lab mix, and I love him to death. Of course, he loves to run. Including away from us when off a leash. Oh, and fences are no match for his black stature.
Hope this helps!
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