You've got it there QBCGuy. Its not about what type of dog anyone may have, its what type of owner a dog has. We used to live on a ranch with lots of property (all fenced) and we used to go to our SPCA and give dogs a home. At one time we had 12 dogs. Some of these dogs were so called "Aggressive dogs" when we picked them up from the SPCA, but after we took them in and actually payed attention to them and didn't abuse them (like some had been) they mellowed out and were turned into friendly lap dogs. A dog on a chain will obviously have a different personality than one that has a run.
If a guy jumps my fence, good, I won't have to give the dogs kibble tonight, they'll get their fill
