If your mates had/has a few and they are all untrustworthy dogs, it say's more about your mates I'm afraid.
I dont keep bull x's to look hard or as a penis extension .....cos i aint got one I keep them because as house dogs and trustworthy working dogs i have found them to be the most biddable easy to train dogs going. Useless as guards, if someone approached me in the middle of a field in the dead of the night they would be licked to death.
I'm not trying to say they are better than any other breed, they are not, get two dominant dogs together and there will be a fight, just as there