"Instinct" is primal, reflexive, and hardwired to all of us, and it is intended by Mother Nature that no one can overpower. To me "training" is to "skew" the instinctual behaviour of a dog, and we can utilize training to intensifies or reduce such a behaviour. For example, no matter how people had abused Yonga, he by nature is a submissive dog, and with time and rehabilitation, he will be one of the best pet that people can ever have (I'm certain of that). And no matter how I train Yuan Yuan, she by nature is of dominating personality. She will always look for opportunities to dominate others. This, as a owner we simply have to accept and embrace.