When I first started with retrievers I was told they couldn't see orange very well because they were color blind. Since then I have always thought they could only see thing in black and white. The other day I was listening to a radio program and they said that humans have 3 color cones in their eyes blue,green and red. then they said dogs only have 2 color cones in their eyes blue and green which is why they can't see some colors like red or orange and it limits them to a wide range of other colors that are mixed with red but they can see the colors blue,green and a mix of the two like yellow. I was just wondering if I'm the only one who believed they only saw things in black and white?