NEW YORK (Reuters) - A kuvasz can search the entire Westminster Kennel Club Dog Show without finding another dog like him. The same is true of a plott, an Anatolian shepherd dog, a Norwegian lundehund and an Entlebucher mountain dog, all obscure breeds represented by a single entry this year at the dog show, which was due to crown its best in show dog later on Tuesday. "He's a kuvasz," Diana Wilson, the handler of a 4-year-old called Tanner, told confused-looking dog lovers visiting the benches backstage at Madison Square Garden on Tuesday evening. "A what?" someone asked. ...