Does your German Shepherd puppy or dog run to the door barking when someone knocks or rings your doorbell? If so, at what age did it start? Our puppy has barked when she was outside and saw someone she didn't know approaching our house, but not when she's inside and someone knocks. Since our puppy barks on command, we've been taking turns with one of us knocking and the other giving the "speak" command. For some reason, we're failing to get her to associate knocking with barking. She does go to the door to investigate when someone knocks, she just doesn't bark when she hears knocking. Our puppy is too young to protect our house and I wouldn't want her to at her age, but aren't puppies taught to bite sleeves and alert bark so they'll have the right foundation when they get older? Would it help if I borrowed a friend's dog that does that for a few days? Is it easier for German Shepherds learn something like that through observation?