 Dollar General Corp. DG, 1.12 shares fell 8 in premarket trades Thursday after the retailer missed third-quarter earnings estimates and said it would fall short of fourth-quarter targets on higher costs. The retails third-quarter net income rose to 526.17 million, or 2.33 a share, from 487.03 million, or 2.08 a share, in the year-ago quarter. 