The stock is trading at its lowest level in more than five years.Dollar General (DG 0.99%) shares lost nearly a third of their value after the discount retailer issued weak guidance with its fiscal Q2 results on Aug. 29. The plunge sent the stock to its lowest levels in more than five years.Let's examine the company's earnings report and guidance and see if this is an opportunity to buy the shares on the dip, or if investors should stay away.Lower-income consumers are under pressureFor its fiscal second qua ...