Dogs can see some colors, but not as many as humans. They have only two types of cones in their eyes, which means their color spectrum is limited to shades of gray, brown, yellow, and blue. This is called dichromatic vision, which is similar to humans who experience red-green color blindness. Dogs can distinguish blue and yellow, and combinations of those colors, but they cannot see red and green. For example, red appears as a dark brownish gray hue or even as black to a dog. Additionally, shades of yellow, orange, and green all appear similar to a dog. Therefore, when it comes to distinguishing color, a dog’s normal vision is most like a person who has red-green color blindness. However, dogs can still see some colors, and their world is not entirely black and white.