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Meet Dolley, a fire dog that sniffs out danger.

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Can dogs see in color? In short, yes! And are dogs color blind? Well, it's complicated. Dogs do see in color, but unlike their human companions, dogs don't see the rainbow and every shade of ROYGBIV in between.

A dog's eyes can process only two colors: blue and yellow. And varying shades of gray, of course. While we used to believe that dogs only saw in black and white, we now know that that's not the case. But why? We're answering some of your most-asked questions about dog eyesight, from whether dogs have night vision to if they have the visual acuity to read.

Do Dogs See Only Black and White?

Negative. This is a common myth, but dogs have way more color perception than just black and white. Dog eyesight captures blue, yellow, any combination of the two, and shades of gray.

So yes, dogs have color vision, but no, they don't see the same thing we see with our human eyes, or bird, who have color receptors into the ultraviolet spectrum. Dogs are color blind in some of the same ways that humans are, though the colors they see (or can't see) are different than those of color-blind humans.

By Steffen Heinz ( caronna) - Own work, CC BY-SA 2.5, Link

Are Dogs Color Blind?

Human beings have three types of cones in our eyes, each one containing cells sensitive to its own color: red, green, and blue. This is called trichromatic. Dogs, on the other hand, only have two kinds of receptors: blue and yellow.

This means that canine vision is closest to what human color-blindness (red-green color-blindness ) looks like. This is called dichromatic. So next time you're wondering why your dog can't seem to find that red KONG in the green grass, cut him some slack. It's not that dogs don't see all the different colors, so much as the color range is compressed into just the blue and green part of the spectrum. Check out the example below:

Why Can't Dogs See Like Humans?

Evolution, that's why. Dogs are built for hunting and seeking out prey. That's why their eyes have high sensitivity to motion at a distance - a whopping 10 to 20 times greater than humans. Their hunting background also means that their vision is suited for the hours just before sunrise and after sunset. Not only that, but dogs have a wider peripheral vision than humans.

What's not important to dogs, however, is rummaging around for brightly-colored fruits and berries. Over time, their eyes adjusted to best fit their needs. Dogs are color blind because they don't need to see all the colors that we do, in short.

It's also worth noting that dogs rely more heavily on other senses, like smell. Thanks to the heavy lifting done by their extra-sensitive snout, dogs don't just don't need advanced color perception-they can smell most of what they need to know.

Why Do Dogs Have a Wider Peripheral Vision?

Chalk this one up to eyeball placement! Because dogs' eyes live on either side of their heads, they can see an impressive 250 degrees. This is 60 degrees wider than their human friends, who max out at 190 degrees.

Of course, there's a range somewhere in the middle - a Labrador, for instance, has a much different facial structure than a pug.

The pro to having close-set, front-facing eyes? The central field of vision where both eyes intersect, which helps with details and depth perception. Where humans have a large amount of this binocular vision, dogs do not.

Can Dogs See in the Dark?

If we're comparing dog night vision to human night vision, then yes. Even though they have fewer cones than we do (remember, that's why dogs are color blind), dogs have more rods, which help with the skills above: high sensitivity to motion and great vision during dawn and dusk.

Dogs also have large pupils, which, kind of like blinds, let in more light. Finally, because dogs are nocturnal by nature, they have a reflective membrane at the back of their eye called the tapetum lucid. This membrane acts like a mirror, bouncing extra light to the retina for bonus seeing power.

Ever walked your dog at night or caught a glimpse of him in the dark? That is the sparkle you're seeing.

How Accurate is a Dog's Eyesight?

Well, not very. We've all seen the Snellen eye chart. If a human's comfortable seeing 20/20, dogs are down at the 20/75 range. That means anything below the third line is a blur.

Even without the finer details, however, dogs are still getting a basic, big-picture idea of the object or scene in front of them.

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Are Dogs Color Blind?: All Your Questions about Dog Eyesight, Answered

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Can dogs see in color? In short, yes! And are dogs color blind? Well, it's complicated. Dogs do see in color, but unlike their human companions, dogs don't see the rainbow and every shade of ROYGBIV in between. A dog's eyes can process only two colors: blue and yellow.

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6 Fascinating Facts About Your Dog's Eyes
By Diana Bocco
Dogs don't see the same world we do. For them, things might look a little grainier and a lot less vibrant. Then again, dogs can also see things we can only dream about.

Here are six fascinating facts about your dog's vision.

Dogs See Fewer Colors Than We Do

While scientists used to believe that dogs were color blind, turns out your dog can see colors, but with a different spectrum. "Dogs do have fewer color sensitive cone receptors in their retinas than their human counterparts," says Dr. Martin Goldstein, an integrative veterinarian and author of The Nature of Healing Animals. "In essence, this would make them similar to a person who is red-green color blind."

That doesn't mean dogs can't see red-it just doesn't look as vibrant to them. "That bright red toy has always looked a brown shade to them," says Dr. Gary Ryder, who works for VCA Southwest Michigan Animal Emergency and Referral Center. "This is why you may see a preferential treatment toward the blues and violets, as that is where the strength of their cones lies."

On the other hand, dogs' vision is more in tune with sepias and pastels than the full range that humans see, according to Ryder. "It has actually been reported that they can very accurately differentiate among different shades of gray, even though they would appear closely associated to us humans," Goldstein adds.

Dogs' Eyes Can Tell You About Their Health

One of the easiest health issues to detect through the eyes is liver disease. "With severe liver disease, a secondary condition occurs where there is retention of bile," Goldstein says. "This is commonly known as jaundice and probably the easiest place to detect this condition is a yellowing of the whites of the eyes."

On the other hand, a very pale sclera (the white outer layer of the eye) can be a sign of anemia from an abdominal bleed or kidney disease, according to Ryder.

In dogs, changes in the size of the pupil can also indicate a serious medical problem. "The pupils can be small when there is pain in the eye," Ryder says. "And two different sized pupils can be present with head trauma." The presence of blood in the space between the cornea and pupil can also indicate trauma or potentially rodenticide poisoning (rat bait).

A cloudy eye can indicate the presence of protein or white blood cells. "This can be secondary to trauma, infection, auto-immune disease, cancer (lymphoma especially), diabetes, and many other conditions," Ryder says.

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6 Fascinating Facts About Your Dog's Eyes

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Dogs don't see the same world we do. For them, things might look a little grainier and a lot less vibrant. Then again, dogs can also see things we can only dream about. Here are six fascinating facts about your dog's vision