http://www.dailymail.co.uk/sciencetech/article-2374872/Dogs-CAN-colour-Scientists-dispel-myth-canines-black-white.html/
I have heard all my life that dogs can only see in black and white. And that really didn't make sense when other animals can see color.
Then I read that they could see blue and yellow.
But they see a lot more color than that.