newcomers from Lexington, Va

Hello, we are Jason and Nicole from Lexington, Va. We have two extremely friendly dogs.
However today I realized a problem and I was frankly horrified. Someone came onto my property and blatantly walked right up and cupped their eyes with their hands and pressed their nose right up to my window. Granted I have no clue who this rude stranger was. My 3 year old American Stafford was asleep just beneath her. He made no response...no alarm etc. She started banging quite loudly...again no reaction. My Rottweiler who is also 3 yrs old made no alarm. I found this very suspicious behavior and was extremely horrified that the dogs we bought to be family guard dogs didn't even bother to bark. Perhaps we socialized them too much as puppies. Is there anything that can be done to retrain them to at least sound alarm and to warn of strangers or odd behavior? We would be appreciative of any and all advice on this.
Thanks,
Jason & Nicole

Do you still have these dogs?

Dear Jason and Nicole
I am fond of dogs and i want to buy some lovely dogs!