Human eye sees color by mixing the signal from three different cones cells in the retina. Cones sensitive to red, green and blue light respectively. The brain interpret color based on those three signals.
How a Dog's Color Vision Affects Canine Sport: How Do Dogs See? Color in dog sports serves the purpose of not only making the event more bright and interesting, but if the colors are chosen properly, they can make the sport safer for the dogs.
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We Asked a Color Vision Expert About the Color of that Dress