Cats and dogs can see in color, but not nearly as well as humans can.  Both cats and dogs re red/green color blind.  This means that red objects look dark to these animals, and green looks white.

So, when pets look at stoplights, red and green holidy decorations, green trees and red flowers, all they see are different shades of gray. 

Cats and dos can see blue, yellow and other colors, but because their eyes have fewer cones (color sensitive cells), than ours do, they see these colos as pale, washed-out pastels.

Sorry, mom and dad, those colorful toys are more for you than them…but stick with yellows and blues for your pets, at least it’s a change from gray.