Dogs’ vision is not black and white. In addition to black and white, their vision is also mixed with red, yellow, and blue light with relatively short wavelengths. To be correct, dogs’ eyes can see some colors. Dogs cannot distinguish bright colors, but they can see very dark red, yellow, and blue. Green in our eyes is white in the dog world. , rich colors are dark.

The world in the eyes of dogs is not only black and white but also colorful

There are two kinds of color photoreceptors, or cone cells, on the dog’s retina, which can distinguish between short wavelengths and Medium and long wavelength light, that is, blue (short wavelength) and red and yellow (long wavelength) hues. Because dogs only have two types of cone cells, dogs can distinguish the same colors as humans who are red-green blind. But dogs do see certain colors. Dogs can distinguish different shades of blue, indigo and violet, but they have no special sensitivity to high-chroma colors such as red and green in the spectrum. One method is to shine a colored light source into a puppy's eyes and analyze the spectrum, or pattern, of the reflected light, and then compare the results with the analysis of the same light source into a human's eyes.

Red is a dark color to dogs, and green is white to dogs, so a green lawn looks like a white grass to a dog.