PetSmart Inc. fell 6.6 percent after the Phoenix-based company reported its fiscal fourth-quarter earnings. Profit for the pet store chain rose, but its forecast for this year disappointed investors. PetSmart reported earnings per shares of $1.24 after the market close on Wednesday, up from 91 cents a year earlier. The company expects first-quarter EPS of 92 to 98 cents and $3.76 to $3.92 for the full year 2013. The consensus estimates are 94 cents and $3.93.