By Andrew Holleran The Dallas Cowboys will be playing at less than 100 percent on Sunday afternoon. Dallas is set to take on Buffalo on the road. But while the Cowboys are coming into the game with high hopes, they are reportedly dealing with an unfortunate illness. Roughly 10 Cowboys players have reportedly been dealing with a nasty stomach bug this week. “10 #Cowboys players, including starting CB Stephon Gilmore and WR Brandin Cooks, have been dealing with a stomach bug this week, per @JayGlazer They’re playing the #Bills later today,” Dov Kleiman tweeted on Sunday. Something has been going…