Weathering will be the correct answer to the question you have asked.
Dogs are not completely color blind...
Although their vision IS very blurry.
I'm pretty sure it is middle ear.
FIVE MINUTES by Matt Barton
The masked man put it simply: "I'm going to kill you in five minutes," and since James had heard him say the exact same line to three of his friends--and noted with some alarm that the man had carried through on each occasion--he knew exactly what lay in store for him. He was tied down with barbwire to a rough sawed plank, but comfort mattered little now. After all, the last thing he wanted to do with his last five minutes was think about how uncomfortable he was on that stupid board. You'd think, though, that someone would've at least sanded it down a bit. And why barbwire? Was that really necessary? Why couldn't he have been killed by a killer who preferred soft nylon rope? And why, for that matter, had he been positioned facing the wall, with nothing interesting to look at? He was the only one of his friends who'd been put this way. Nothing to see but cheap wood grain paneling. It was maddening. What an insult! And, to make matters worse, he had to pee. He didn't mind not getting a "last cigarette." He didn't smoke. But he did have to pee. Jesus Christ, what a lousy way to spend five minutes.
