Class: an elusive concept, in horses as in people. That's because it refers to something inherent, something beyond external trappings. In this business, most of us will have observed how someone can be wealthy and still have no class; and also, more pleasingly, how material poverty need not diminish those human qualities that elevate a person from the mean (in every sense of that word). To whatever extent it may be heritable, then, one core indicator of class is perhaps durability itself. For that is the very opposite of the...