My dog Sarge is about 10 months old. He has never shown any signs of aggression, but yesterday we were outside when one of the neighbors came walking up the road pushing a stroller and had a toddler walking with him. Sarge started growling and was walking towards them. His hair was standing up and I think he meant bussiness. I got him under my control and apoligized to the neighbor, but felt like a jerk. This has realy bothered me.