Couple pleads guilty in toxic pet food case By HEATHER HOLLINGSWORTH KANSAS CITY, Mo. (AP) — A Las Vegas-based company and its owners have pleaded guilty to distributing a tainted ingredient used to make pet food that killed potentially thousands of dogs and cats. Sally Qing Miller, 43, and her husband, Stephen S. Miller, 56, along with their company, Chemnutra Inc., pleaded guilty Tuesday to one count of selling adulterated food and one count of selling misbranded food, both misdemeanors. They initially were charged with 13 counts of introduction of adulterated food into interstate commerce, 13 counts of introduction of...