The owners of two dogs that attacked and killed a neighbor in their San Francisco apartment building were found guilty Thursday of all charges against them, including involuntary manslaughter and having a mischievous animal that kills. One of the owners, Marjorie Knoller -- who was present during the January 2001 mauling -- was also found guilty of second-degree murder. Courtroom spectators gasped, and Knoller, 46, grimaced, trembled and breathed heavily as the unprecedented verdict was read. "Oh my God," she mouthed. Her husband, Robert Noel, 60, sat silently as the verdict was read. He was not at home at the time of the attacks, but jurors apparently agreed with the prosecution's argument that he and his wife had ignored repeated warnings about their two large Presa Canarios -- Bane and Hera -- and knew they were a danger.