If HBO thought its horse-death drama was out to pasture, it was mistaken. HBO canceled its horse-racing drama Luck in March, after several horses died on set. Now Barbara Casey, a former director of production in the American Humane Association’s film and television unit, is filing a lawsuit against the organization and HBO, claiming wrongful termination and alleging that the network covered up animal abuse for months before the series was canceled. She says horses were drugged, underweight, and often sick—and that HBO pressured the AHA to violate animal-safety standards in order to save time and money on production. HBO denies the charges.