For three days, a three-legged dog from Southaven, Miss., was away from home, and his family had no idea where he had ended up. He was eventually found alive about two blocks away at the bottom of a sinkhole estimated to be 20 feet deep, as WREG reported. What happened? According to his owner, Carla Chadwick, the dog got out of the yard at about 7 p.m. Saturday, and for days she did not know where he was or whether he was safe. The dog turned up…