Aggression is not a breed thing. Its a state of mind, and it comes from how the human is with the dog. There are four levels of energy, regardless of the breed: low, medium, high, very high. The idea is to get a dog in your same level or lower than you.
I'm happy to tell you that having been through surgery and chemotherapy and radiation, breast cancer is officially behind me. I feel absolutely great and I am raring to go.