Dogs, like most other mammals, have no color view. Yesterday in 1909, it was established that dogs of color are not distinguish, and respond only to the degree of brightness, in other words, are color blind. Later there were reports that a small the percentage of hunting dogs seems to be able to distinguish some colors spectrum.
However, at the end of 1969, in a special consultation there was an explanation is printed from which it follows that dogs possess achromatic vision and see the world only black and white. Otherwise saying they see a color image in gray tones. Only the intensity of gray for them will be different: yellow they seem light gray, orange and blue – a little darker, and red, green and violet – dark gray, almost black. Dogs can very accurately distinguish squares or a circle and an ellipse with a ratio axis 9: 8, but to distinguish between colored squares among the set white, gray and black can not.
The dog’s vision is generally very different from that of a person. They, like their ancestors – wolves and generally dusk and night animals, the retina consists mainly of sticks. Unlike humans don’t have a yellow spot on the retina, which means there’s no the bulk of the perceiving color cones. This explains why dogs do not distinguish colors.
