Why do doge see black and white?

Answer 1

Dogs are color blind because they have only two types of cones, the photoreceptor responsible for color vision in humans and some other primates. Humans have rods and cones. Rods are sensitive to differences in light level, or shading. But only cones are sensitive to the different wavelengths of light, which account for color. Humans can see in color because we have three types of cones, allowing for a comprehensive spectrum. Graphically, the three types of cones form a triangle, and we can see any color inside the triangle. On the other hand, dogs and many other non-primate mammals have only two types of cones. You can picture that as the two ends of a line segment. A dog can only see colors along that line, a much less robust perception. Sea mammals typically have only one type of cone, but some birds and fish have as many as five.

Answer 2

Dogs are color blind. They do see color. Just like people who are color blind, dogs see red as green and vise versa.