Dogs have dichromatic vision, meaning they have two types of color receptors.

Humans have three types of cones in their eyes, allowing us to see a full range of colors. Dogs, however, possess only two types of cones, which limits their ability to distinguish between some colors. This is why dogs see the world differently, especially in terms of color perception. Their vision is similar to a human with red-green color blindness, where reds and greens are harder to tell apart.