Study shows world of dogs is more colorful than just shades of gray
You can stop feeling guilty that your dog sees the world in shades of gray while you see everything in color. Research suggests that Fido can see colors after all. OK, not every color, but with two color receptor cones instead of our three, they can see browns, yellows and blues — like a red-green color-blind person. Russian researchers tested their theory by placing colored paper in front of feed boxes. If the dogs chose the right color, they were able to open the box and find a piece of meat inside. Boxes with the wrong color were locked. Most dogs quickly learned to follow the color cues, proving that these pooches saw the world in color — and that they really love meat.
From Ed and Pat Gil-bert’s K 9 newsletter