From Dogs In Service

http://dogsinservice.blogspot.com/2012/04/first-i-want-to-say-that-reason-i.html

I just want to add that comments I see regarding Pitbulls stress they are not human aggressive. To use their own phrase-all dogs bite. Secondly, they seem to carefully omit the fact that dog aggression is inherent in the breed hence the great lengths that many pitbulls will go to in order to attack and kill another dog.