K-9 officer Schawn Barger was wrestling with a drug suspect Friday when a quick-release button on his belt was activated. That opened a door to his K-9 wagon, which allowed Dolpho, a 5-year-old German shepherd, to get free and run onto Margaret Street. The dog bit 9-year-old Brandon Livingston on the right leg and dragged him for about 20 feet, according to his mother Lorraine. Witnesses said Barger commanded Dolpho to stop at least four times, but the dog kept going after the boy, who is black. "We saw the policeman, then the dog, and we all started running...