Pit bulls usually weigh no more than sixty pounds.  I've stopped them from attacking my rescue dog with ease and addressed the owner in each case without reprisal.  Other breeds like Golden and Labrador Retrievers have not been so easy to push off and the owners are usually more belligerent than their dogs, hence the problem.
 
Pit bulls get a bad rap from the media.  In the early twentieth century they were the nanny dog in Britain when people knew how to raise and interact with a dog.
 
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