I have a 12 week old GS puppy. We have had her for 6 weeks now, and she use to be great around people! Now within the past 2 weeks all she does it bark at people walking by (we live in an apartment complex) and she gets so distracted outside that she doesn't go potty because she is too concerned what others are doing, her back hair stands up and she begins to become defensive. We have socialized her since day one, like I said she use to be great and LOVE people. Now it's as if she's too defensive and barks at everyone! Help!!