The first and most lasting thing I learned as a USAF SP MWD handler was “[bleep] rolls down leash. It ain’t necessarily the dog and more likely the owner. And, after working 25 years as a LEO I have yet to be bite by a pit bull. Am I careful around them? Yes. I’m also careful around other large breeds such as German Shepherds, Mastiffs etc. The only dogs I’ve been bitten by on duty have been border collies because their owners don’t have enough sense to stay on the same side of me as the dog is and the dog nips me in the thigh every time trying to move me like cattle. Again, the dumb owner not the dog.
