I think the man holding the lead has a lot to do with how good a dog can be unless it's a out and out coward some people get a lot more than others from any dog from any line.. patience ,, the way it's started ,, experience ,, the way it's kept ,,, upbringing all play a big part and finally what's expected of the dog A brilliant dog for one man minght be mediocre for another ,,, ther far to many variables involved people seem to forget the the percentage of bad owners in the terrier game is proberly higher than the percentage of bad dogs but they all got a computer and a mouth and are har