North Augusta, SC—This family’s backyard is quiet today, but Monday afternoon, the scene here was chaotic. Aiken County deputies say two children were at home with their father when he ran up the street to get his five-year-old little girl some medicine. She went to the back yard to play. Sgt. Dave Myers: “The little boy heard the commotion in the back yard.” The commotion, investigators say, was the family’s pit bull, attacking the girl, and her ten-year-old step-brother leapt into action. Sgt. Myers: “Ran out there, tried to punch the dog off the girl. Wasn’t working, the dog wasn’t...