I do think Bob is hunting in the habitat you fellas have never experienced. It sounds like he is drifting into some good old fashion Iowa CRP. It doesn't matter the color of the dog, you can't see your fellow hunter's boots, heck you can't tell if your fellow hunters are wearing pants! This stuff is what you "never use a bell" hunters have never ever been in. Unless you have a dog that freaks-out if they lose sight of you....you will want/need a bell, if venturing into this stuff. Or you are that guy with the GPS, who is standing around watching a screen, who says, the dog is XX number of yards in that direction and then good luck finding him.