12-year-old was killed by family dog; owner sees loss as tragic accident but defends breed as making good pets. Hours before being mauled to death by the family pit bull, 12-year-old Nicholas Faibish had been told to stay in the basement separated from the dogs, said his distraught mother, Maureen Faibish, who called The Chronicle on Saturday, trying to make sense of what she called a "freak accident.'' "I put him down there, with a shovel on the door,'' said Faibish, who had left the boy alone with the dogs on June 3 to run some errands. "He had a...