Dog's sight? please answer.?

Question

Can someone please explain why dogs can see only certain colors? if you don't know don't answer or i will report you. :-)

Answer 1

They can see all colors but they only see the britest one like if you were to show them red with a black stripe they could only see the red around it...

Does this article help???

Popular wisdom has it that dogs are color-blind, but recent research suggests that a dog's world is not all black and white. To understand what dogs can and can't see, it helps to have some basic knowledge of vision in humans and other mammals.
We began by searching on "dog vision color," which took us to a page from the National Hunting Retriever Association site. Summarizing a 1995 article originally published in the Journal of the Veterinary Medical Association, the page describes the fundamental design differences between canine and human vision. Our vision is optimized for seeing in bright light, while dogs, like many other predators, see best in dimmer light.

How Vision Works describes the anatomy of seeing and the role of the retina, a structure at the innermost layer of the eye that senses light and sends visual information to the brain. Two types of photoreceptor cells in the retina -- rods and cones -- respond to light and transmit electric impulses to the optic nerve through a series of chemical reactions. Rods process visual information in dim light and are sensitive motion detectors, while cones handle color and detail. The human retina contains approximately 100 million rods and 7 million cones.

Cone cells contain pigments that perceive specific wavelengths of color. Human vision is trichromatic -- we have three types of cones that recognize different portions of the color spectrum. These cones allow us to see a range of colors that are a mix of red, blue, and green pigments. Dogs have only two types of cones -- their dichromatic color vision is similar to that of a human with red-green color-blindness. In addition, a dog's retina contains a much smaller ratio of cones to rods than ours does. An article about Canine Vision, written for a college psychology course, includes a graphic that contrasts the yellow, blue, and gray spectrum of the dog's world with the familiar rainbow of colors we perceive.

Before you start feeling sorry for Fido, keep in mind that although he may not have the color range and visual acuity (focus) that you depend on, his night vision is far superior. Thanks to a reflective structure behind their retina called the tapetum lucidum, dogs see objects in the dark as if lit by an eerie glow.

If you want to learn more about the mechanics and evolution of color vision, an illustrated account titled Color Vision: Almost Reason Enough for Having Eyes will increase your understanding.

Answer 2

They have partial color blindness. The sensors in the retina are only strong enough to pick up certain colors. Some humans have the same problem.