I went on a walk tonight through a neighborhood that is filled with families, but has a lot of dangerous through traffic. I was walking my 4 mo old lab. Out of the corner of my eye I saw an enormous, probably 70 lb, pit bull. He was behind a short chain link. This was ridiculous to have a dog, that was showing his protective instinct by trying to scale, behind such a short fence. It was irresponsible by the owner and darn it, if that dog had gotten out, I would probably be on my way to the ER. The owner should be responsible. If you are going to own a dog that has the intrinsic desire to attack people, then one has to be accountable. Some people state that it is all in the way you train the dog. That being said, I have only know one lab that was a biter and every pit I have known I have had to tip toe around not to get eaten.