Lots of people think that dogs see in black and white.But this is not true. Scientists recently discovered that dogs do see colors,just not quite the same colors that we do.When people see a rainbow, they see purple, blue-green,green,yellow,orange,and red.But dogs see a rainbow, they see gray,blue, gray, yellow-brown,yellow,and yellow-brown.Can you imagine?Dogs see red and green as a single color(yellow-brown) and also blue-green and purple as a single color(gray).This means if you buy your dog a bright red toy,it will see it as an ugly yellowish brown.Why?Well,a human eye has three different types of cells that can detect color. Dogs'eyes, however, have just tow.This makes the range of colors that they can pick up much more limited.