I work on irrigation and sprinkler systems in peoples yards all summer. People tend to think all their dogs are fine. They are not. I trust no dog unless I know it well. Most common biters here are healers and other small to medium size dogs. I do not have much experience with Pits, Rottweilweiler or shepherd types , because I call the owner and tell them I do not work in yards with dogs, so you have to put them up. Digging in a valve box at ground level puts you at a decided disadvantage. One thing I have noticed is since I got my rat terrier other peoples dogs act more defensively towards me. My 25 lb rat must smell aggressive....... Children should never be left with any dogs ,when we were little my cousin got his bottom lip torn most of the way off by a 10 year old beagle that would normally not harass its own fleas.... Because children do not always make wise choices.