Hi, my name is Kini, from RC South Dakota, I'm new in here and I have some concerns about our 2 yr old german male rott whom we've had for two years.He lives at our business, like a shop dog, so that we can be with him all day. He is use tocustomers,the UPS and the mail man, our three boys and our two employee's. Today thought, we recieved a free amerian/german rott female, not quite two years old. They were typically nervous, excited and distant, argumentive and aggressive, then once they spendseveral hours together we noticed they were lying down together under one of the trucks in our fenced area. Well, now the male rott is growling at me. Because of herscent on me? I'm confused. He will still give me kisses, come to me and let me pet him, buthe will also GROWL at me ???? WHY ???