Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis. What: Shares of sporting goods retailer Dick's Sporting Goods ( DKS 0.01% ) plummeted 17% today after its quarterly results and outlook disappointed Wall Street. So what: Dick's stock has struggled in 2014 on signs of slowing growth, and today's Q1 results -- adjusted EPS of $0.50 missed the consensus by $0.02 on a revenue increase of just 8% -- coupled with downbeat guidance only reinforce that trend. Management blamed the bad numbers on weak demand for hunting gear and a whopping 10% same-store sales decline at its Golf Galaxy franchise, giving analysts plenty of negative vibes over its product mix and competitive position going forward. Now what: Management now sees full-year EPS of $2.70 to $2.85, down significantly from its prior view of $3.03 to $3.08.