Editor's note: This column is the first in our new series about the strides horse racing is making to advance the ethical treatment of racehorses. On many levels, those in horse racing and breeding are working to ensure the sport is humane and ethical. New studies and standards about track surfaces, stress, medications, diagnostics and more, shed light on how to ensure the safety and comfort of racehorses. Enforcement of anti-doping regulations has reached a new level with better use of surveillance, hotlines and other anti-crime tactics. And in the...