chaos........Im fairly new to the breed too. My black one is a mutt and he is about 2. HE has been really good. Easy to train. THe white one I just got from a friend of a friend. THe owner took decent care of him, but didn't give him a whole lot of attention. So he is taking a little work, but a real loving dog.
rhino.---presa's are amazing. That may be my next dog.