It really doesnt matter what dog it is, You should be more interested in the owner and even that doesnt fall to stereotype. Im 22 and own three of the big bad bull breeds, They are great with cats, kids, ferrets, other dogs and to be honest from my experience id be more worried about your little patterdale starting a fight not my "killer" bull breeds. And yes they are walked on chain leads because of the strength of them and the fact they chew their leads. As I said its irrelevant what breed of dog it is, If youre worried about him letting it into your garden when you say he is lamping the fie