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Can Dogs See Color
It is not true that dogs are completely color blind. While dogs do not have the same color vision as humans, they are able to tell yellow from blue. Like a human with red-green color blindness, they are unable to tell the difference between red and green.
The reason for this limited range, in both the color blind human and the dog, is that there are only two kinds of color receptors in the retinas of their eyes. While most humans have three kinds of colour cells, with three different receptor molecules sensitive to blue, greenish-yellow, and red, dogs only have receptors for yellow and greenish-blue.
Canine eyes also lack another human trait: the fovea, an area especially dense with detail-sensing cells. As a result, their detail vision is not as good as ours. But they make up for this by having much better night vision and greater sensitivity to movement.
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