Quote Originally Posted by DarkSean View Post
I don't think its down to the individual dog as a whole. I think some breeds are just naturally passive and some more natually dominant.
You're right, it's not really the individual dog. The breed does play into dominance. But it does NOT play into aggressiveness. Dogs become aggressive when they are left with no leader.

Take my mastiff, for example, he is EXTREMELY dominant. We are certainly working on him, but he is dominant by nature. He is only 7 months old and would absolutely dominate me and turn aggressive if I allowed it. Corsi, as a breed are just dominant. I wouldn't recommend one to anyone that I wasn't sure could handle one. He probably will always be dominant, just never outright aggressive. His girlfriend is very laid back but she's just as dominant as he is.