Dogs do NOT see in black-and-white.

Yes, dogs are partially colorblind, but that does not mean they do not see any color at all! Man’s best friend suffers from a kind of colorblindness that is called deuteranopia in humans. Both people and dogs have three different varieties of color receptors in their eyes: one for red, one for green, and one for blue. Deuteranopes, and similarly all canines, do not have the green color receptor and therefore cannot tell the difference between shades of green and other colors!

Source: The Straight Dope

What are those stars and colors we see when we rub our eyes called?

Have you ever wondered what's the name of those stars and colors that we often see when we rub our eyes or which suddenly come up when we get up in the morning? These little stars and colours are called Phosphenes.