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.
Cesar MillanDiscipline isn't about showing a dog who's boss; it's about taking responsibility for a living creature you have brought into your world.
Cesar Millan