I met a lady a few years back who was walking her two terriers. one was a Yorkshire terier and the other was a bigger yorkshire cross , so I thought. I asked her what is the bigger terrier adn she said that it was a pure Yorkshire that was from a breeder who had successfully inlarged the breed through his breeding programme. It looked like a westie with a yorkshiore coat. The larger of the two I could see fit for a few rats, thats about all . Sure thats what they were bred for anyways, ratting in the mines. Joe Kelly