My GSD that has the issue is my 9 month old male Chance. He is very protective of our yard (and tends to be a bit aggressive- usually just towards small dogs.) When we put the dogs in the yard he will bark at anything that walks by the fence, noise or whatever. We have gone to the door and said, "No, quiet, no barking" etc, but I don't know if he knows that we are mad about his barking. We have tried to bring him inside when he barks to separate him from the yard n our other pups- but that doesn't work either. Someone mentioned a shock collar? We have not tried that. Chance is a great dog, learns so fast and I know we can figure this out with him, we just aren't sure which direction is best- to eliminate his excessive barking.