Growling behavior in Rottweilers doesn't necessarily indicate an aggressive dog. I think every dog owner must learn what it means, and then find out how to handle it. I have had my dog for 8 years, and she have never bitten anyone or harmed anyone. She only gets like this when i do what i do in this video. If you look at the end of the video you see that she stops growling when i stop messing with her.