Our GSD puppy has grown to be about 72 lbs at 10 months. She is fairly tall and has a very deep bark/growl. I have never owned a GSD before but am learning the breed. We have taken her to obedience classes and she minds me fairly well except in public. She barks at all other dogs when on walks and pulls her leash. My wife told me today she took her on a walk and our neighbor who has a two year old toddler was out walking him in a stroller. They are afraid of our dog probably because of her breed and this is the second time that they grabbed the child to walk back toward their home as if our dog is going to get off the leash. When they did this Shelby started growling at them. This is a young father and his baby, not another dog. I have never seen her do this. My wife admonished our dog and started walking her back to our house and tried to explain she is 10 months old and is really more scared of strangers than anything else. They said she doesnt look like a puppy which is true she is large. I'm very concerned because a dog should never growl at a person like this expecially when they are retreating. I don't know if it is because she sensed their fear or what. She has never tried to bite anyone. She snaps at other dogs out of fear or to let them know she doesn't want a male sniffing her or whatever but has never growled at people and certainly not a child. My wife told me that another time she was walking her that a man with GSD experience said he noticed that she was already getting possessive of my wife and was typical of the breed. I'm wondering what I can do about this or how serious this is. I don't feel good knowing that our neighbor with a small child is afraid of our dog. If she hadn't growled and they were afraid of her with her ears back wagging her tail it would be one thing but her growling at a man with a toddler is something we need to address asap. Input anyone with GSD experience ?