2. Dogs can actually see colors, but not nearly as many as us.
For long it has been believed that dogs can only see the world in black & white. The fact that dogs are color-blind has been misrepresented by many into thinking that they can see no color at all. In fact, dogs do see in color but are not high in contrast or quality as us. While humans have three types of color-sensitive cones in the retina, dogs only have two. The three cones give us the full range of color vision and the two types of cones dogs have puts them in similar situation with human color blindness.
A study conducted by the University of California, Santa Barbara, confirmed that dogs actually see color, but fewer than normal humans. While humans see rainbows as VIBGYOR ( Violet, Indigo, Blue, Green, Yellow, Orange, and Red), dogs see it as dark blue, light blue, gray, light yellow, brown, and very dark gray. Basically, they see the world in yellow, blue and gray.