Shorty, Oscar Meyer, Razzle, Slinky and Conan. They’re wiener dogs, dachshunds, charging down a greyhound track, their long low-to-the-ground bodies undulating, their floppy ears flapping, their pointy muzzles yapping, to the amusement of anyone willing to make the trip to La Marque. You don’t normally hear laughter at a race…