A four-day dog show is coming to Dunkirk Thursday through Sunday. Over the course of the show to be held at the Chautauqua County Fairgrounds, as many as 135 different breeds or varieties of dogs will compete. Dogs are judged first within their own breed. Winning dogs advance to variety groups: herding, non-sporting, hound, sporting, toy, working and terrier. The best in each group advances to the competition for best in show.