Dogs can only see blue, yellow, and some shades of gray. Dogs would see a rainbow as dark yellow (sort of brownish), light yellow, gray, light blue, and dark blue. Dogs don't see red, purple (violet), or orange like we do. So yes they are colorblind.

Dogs do not see in black and white, but they are what we would call "color-blind," meaning they have only two color receptors (called cones) in their eyes, whereas most humans have three.

In dogs, however, the two color receptors in the eyes perceive wavelengths of light that correspond to blue and yellow, meaning that dogs see only in combinations of blue and yellow.

They just may not see the “true” color of an object. For example, the color red appears dark brownish-gray or black to a dog. And yellow, orange, and green all look a bit yellowish to a dog. Our furry friends see blue really well, but purple looks the same as blue to them.

When playing a game of fetch, dogs cannot tell the difference between a red ball and a yellow ball.

dogs simply do not have the ability to perceive colour in the rich, vibrant tones that we do.

Only see blue, yellow and some shades of Grey.

not colour blind

dishita is right