Has little to do with breed but more with socialism and training as a pup.
No room for any aggressiveness in my kennels, period.
X2 As some of yall know I keep mostly females on my yard (YBMC). If you think that females are not aggressive you are as wrong as you can be. Dogs are pack animals to begin with and they have got to learn their place in the pack. And that needs to start when they are pups. There is a pecking order and it has got to be set at an early age. My dogs are turned out every day to run and play with each other. Some are kenneled together and some are not but they all know their place in the pecking order of this yard.