Why are Pitbulls aggressive to other dogs?

try putting up a privacy fence up around your entire yard including the front of the house because unless they have the humane Society come over and say some thing your not going to get any where and as for your fear for the little girl you need to warn child protective services before some thing bad does happen or before she walks in the wrong persons house and the pit who is not at fault in this matter attacks someone or another dog or cat please keep in mind it is never the fault of the dog but is the owners fault for not properly training there dog