How I'm Supposed To Get Any Ridin' Done?

These two were rejected for slaughter because of toxic drugs in their system.

American horse meat slaughtered in Canada and Mexico is being rejected by European buyers because the meat is deemed too toxic for consumption. 

These two collapsed and died together while walking around the parade ring.

All The Tired Horses 

Source: NYT, Racetrack Drugs Put Europe Off U.S. Horse Meat, by Joe Drape, 12/08/12