DALLAS — A new Texas law went into effect at midnight Friday that could put dog owners behind bars for up to 20 years if their pet fatally attacks someone. Just hours before earlier, a six-year-old Dallas boy was mauled to death by his family's dog. The mother of Scott Warren said the family had had the pit bull since Scott was a baby. Kressie Warren said Friday's attack was the first time the dog had snapped at anyone. But, she says, with a young daughter in the house, now her only child, it will be the last. "It's going...