just had to add something here:

on tuesday, i went over to my aunt's house (who has a dobie) and my cousin said something that was actually very true (using princess, the dobie, as an example) "princess is not an agressive dog, but if your scared, she can feel that and so be agressive herself. i have a golden named trisha, and she's a very agressive dog, but people love to pet her rather than princess just because of their looks." or something along those lines.

i just think that this is very true and a good point brought up.