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What Colors Do Dogs See?
4 min read
By Monica Weymouth
In some ways, humans and dogs see the world very differently. What you
perceive as a fire hydrant, your dog sees as a can’t-miss communication
center. It may look like an ordinary vacuum cleaner to you, but your
pooch obviously detects something more sinister lurking in the closet.
One thing we do have in common with our four-legged friends? We see the
world in color.
Are Dogs Color Blind?
Although early research suggested that dogs were unable to perceive
color, the popular notion that dogs see in black and white turns out to
be nothing more than an oft-repeated myth.
“Contrary to popular belief, dogs can see color, too,” says Dr. Shelby
Reinstein, a veterinary ophthalmologist at Veterinary Specialty and
Emergency Center in Pennsylvania. “Color vision is possible due to
specialized types of photoreceptor cells in the retina called
cones. When these cells are stimulated, they transmit a signal to the
brain, which is perceived as a particular color. Humans possess three
types of cones. On the other hand, dogs possess two types of cones, so
their ability to perceive colors is limited compared to humans.”
Humans have blue, red, and green cones, whereas dogs have a blue cone
and a visual pigment that falls between a human red and green,
describes Dr. Gustave Aguire, professor of medical genetics and
ophthalmology at PennVet. “The eye really is complex, and the retina is
an extremely beautifully organized structure meant for capturing
light,” he says.
In comparison to rods, cones also excel when it comes to the ability to
see fine detail. Therefore, people are better able to make out the
minutia of things seen up close in comparison to dogs.
Can Dogs See Color?
So what exactly is your pup seeing at the dog park? Even without being
able to interpret every hue, his afternoon isn’t all that different
from yours—especially if you experience a form of color blindness. “Dog
color vision is quite similar to a person who has red-green color
blindness,” explains Reinstein. “Dogs see shades of blue, yellow and
green, which when combined, can be perceived as grayish brown, dark
yellow, light yellow, grayish yellow, light blue and dark blue. This
probably explains why dogs love chasing a bright yellow tennis ball on
the green grass under the blue sky.”
Sight, of course, is much more complex than color—it’s not just about
the colors of the rainbow, but the arc of the rainbow, the sharpness,
the plane flying through it. While the human eye has advantages when it
comes to perceiving some colors and fine detail, in other environments,
canines have the upper hand. “While we do not think that dogs can focus
as clearly on close objects, and therefore rely on smell and taste, we
know that they are able to see better in dim light,” says Beale. “They
possess more rod photoreceptors for dim lighting in the middle of their
retinas and have a tapetum lucidum that reflects light through the
retina twice—we see this as dogs' eyes shining in the dark.” Rods are
also better at picking up movement than are cones. So, if your dog
appears to be tracking something at a distance, particularly in dim
light, you should pay attention.
“Even though a dog’s vision palette isn’t as vibrant as ours, their
other senses are so heightened,” adds petMD trainer Victoria Schade.
Take, for instance, a dog’s keen sense of smell. Dr. Katy Nelson,
veterinary expert for petMD, shares an example of smelling a bowl of
salad. “We would smell the salad and maybe the salad dressing,” she
says. “If a dog smells that same salad, he’s going to walk up and smell
the tomatoes, and the cucumbers, and the specific type of lettuce, and
anything else you put in there. He’s going to smell all of those
individual smells.”
While researchers believe that all breeds perceive roughly the same
spectrum of colors, other components of sight do vary depending on
anatomy and size, which can differ wildly when it comes to dogs.
“Certainly the perspective differs between a Great Dane and a
Chihuahua,” says Dr. Brady Beale, a clinical instructor
of ophthalmology at the University of Pennsylvania’s PennVet.
“Additionally, the position of the eyes on the head of the dog varies
between breeds. If eyes are close together and a nose is relatively
short, there will be a bigger overlap in the visual fields of the two
eyes. This is called binocular vision, and larger overlap would provide
more information for depth perception.”
So if you’ve been wondering whether dogs can see colors or if dogs can
see in relative darkness, the answer is simple—yes. While their vision
capabilities are slightly different than humans and they can see better
in low light settings, dogs generally experience the world of sight in
a similar way to their two-legged counterparts.
Even if their ability to perceive color is limited, “I certainly don’t
think that changes their perception of the world by any means,” Nelson
says. “I do feel like they get the full experience of it out there.”
Image: [80]Annette Shaff via Shutterstock
tapetum
A single layer of cells
retina
The layer of the eye that is charged with receiving and processing
images
ophthalmologist
A professional skilled in the study of the eye
genetics
The study of the laws of inheritance n living things; may also be
referred to as breeding
ophthalmology
The study of the parts and health of the eye
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