I still go with the training part, its the owner responsibility for what they became. I had a rottweiler that came to me at 1 yr old with issues, by the time I was done with him he wouldn't hurt a fly and was docile, goofy, and lovable to the day he died (best dog I ever owned - miss him every day). Wouldn't fight over food in a bowl, played with children, and even had pet cockatiels that would stand on his back while he smiled. Have had many dogs, I will never accept any aggression of any kind from my dogs, I am the one-and-only Alpha Male, period.