I am a first time GSD owner. I have had Schindler for 3 months. He is 2yrs old. The first 2 years of his life were spent in a fenced in back yard and he was only allowed inside during bad weather. I am wondering if that has anything to do with him not barking. In the 3months I've had him he has only barked a handful of times. Usually when he see an animal outside our fenced in area while he is outside. He has only barked inside the house once when my husband was playing with him and running around like a maniac..lol. He does not bark when people drive up our driveway (inside or outside) He does not bark when someone knocks on the door or walks up to the house. Is this normal? Should I be thankful or worried?