In the past, many veterinarians believed that dogs could only see in black and white, but recent studies show that they do actually have some color vision although it’s not as bright as a person’s. It turns out that dogs only have 20% of the cone photoreceptor cells—the part of the eye that controls color perception—that humans have.

While we can’t necessarily ask dogs to read out an eye chart or pick out different colors, conducted tests show that dogs can only see the world in different shades of yellow, blue and gray.

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Source ; Pedigree.com