How many cones do dogs have in their eyes?

Question

I know that humans have three - blue, green, and red - and some animals have even more, allowing them to see things we can't - but I've always heard that dogs see in black and white. How many cones do they have in their eyes, if any?

Answer 1

Dogs have two sets of cones, which is why they are Red-Green colour-blind. They don't see in black and white. Rather, instead of seeing Red, Orange, Yellow, Green, Blue, Indigo, they see Yellow, Yellow, Yellow, Green, Blue, Indigo.

See links below

http://www.uwsp.edu/psych/dog/LA/davis2.htm
http://www.vetinfo4dogs.com/dogsee.html

Answer 2

dogs see yellow and blue .they see green,yellow and orange as yellowish.they see violet and blue as blue and bluegreen as gray.red is black.hope it helps and thus concludes are science class for the day!!!lol