World's smallest horse has tall order By JEFF DOUGLAS, Associated Press Writer Mon Mar 19, 9:31 PM ET ST. LOUIS - At just a hair over 17 inches tall, the miniature horse is more inclined to walk under fences than jump them. And her owners have sheltered the mare from ever gaining "circus-sideshow" or "one-trick-pony" status. As the world's smallest horse, 5-year-old Thumbelina, weighing in at 57 pounds, has a bigger mission: to raise $1 million for children's charities this year. ADVERTISEMENT Handler Michael Goessling, son of miniature horse farmers Kay and Paul Goessling, says Thumbelina is the ideal child...