Interesting thread and not the answers I might have expected. So my 2 cents:
Golden came thru its IF a couple months ago and NAILED my female chow/Germ. Shep mix. There was no playing here, teeth bared, tail down, sent her off her feet. Kicked him and yelled which sent him home.
Had to get my other chow mix (pure coincidence, I never liked chows…) clipped. Groomer was, um reserved about doing him due to prior chow issues. He was fine, however, as part of his brain said he was meant to be a foof dog, pampered, blow dried, etc, and they said he could come back any time. On the other hand he did bite the UPS man one day; not serious, thankfully!
When I was pre-teen, we had a beautiful young boxer, raised from pup. He bit a babysitter, and a neighbor and there were a couple other near misses. My father gave him to a minister w/ FULL disclosure, and that man got bit also.
What I wonder, as I read this, is whether or not there is more aggression evidenced in purebred dogs vs mixed breeds?