Penny Chenery, who took over her father’s thoroughbred farm with little knowledge of horse racing and became one of the few prominent women in the sport as the owner and breeder of Secretariat, perhaps the fastest horse who ever raced, died on Saturday at her home in Boulder, Colo. She was 95. Her death was announced by her family. When Secretariat won the Kentucky Derby, the Preakness and the Belmont Stakes in 1973, capturing the Belmont by an astounding 31 lengths, he was a national celebrity. He appeared on the covers of Time, Newsweek and Sports Illustrated and attracted thousands...