In Florida, a fight over dog racing pits a waning generation of gamblers and trainers against animal rights advocates

The greyhound race has followed the same pattern for almost a century. With a metallic screech the lure sets off, and eight dogs burst onto the track in chase. A half-minute later, the explosion of speed leaves a trail of sand, cigarette butts and torn betting slips in its wake, to be repeated across a hot afternoon.