why r dogs color blind?

Answer 1

Dogs ... like cats are not really colour blind ... they just do not see the billions of colours the human eye is able to see. Think of Crayola crayons. We see all the colours in the largest box they have ... the dog sees a range somewhere in the 12 crayon box.

The reason for that is dogs have fewer 'rods' and 'cones' on their retina than humans. The retina (the soft, light-sensitive layer of tissue that lines the back of the eyeball wall) is made up of millions of light receptors in humans. These are called rods and cones. Rods are much more sensitive to light than cones. Each eye has about 125 million rods that help us see in dim light and detect shades of gray, but they cannot distinguish colors. In comparison, the 6 million cones in each eye allow us to see in bright light, and they also sense color and detail. Dods don't have anything near the numbers we have.

Answer 2

They aren't. There was a news account recently on The Today Show that says it is a myth and dogs do see colors. You can probably find a link to the information on the show's website.

Answer 3

Dogs actually aren't color blind. They see in color, but it's a duller than we see it in. It's kind of like they are looking through sunglasses that aren't quite so dark tinted.