Aggressive towards neighbor
I am new to this site but have already recieved awesome information from Castlemaid ( I think thats what the user name was). I have a question. My neighbor, who has stolen my cable 3 times, tried to steal gas out of my cars and just a plain dirt bag, and yes i have proof and police reports, my german shepherd growls at him and barks uncontrollably, the hair on her back raises up when she sees him, and she stares a hole through him, at first i was worried that it was everyone over there, however when he has friends over she doesn't bark or anything until she sees him. Is this normal or has he done something or tried to do something to her that I should be worried about?