Dogs Can See Colors

Although dogs can see colors their vision isn't as vivid as ours, nor is the color spectrum they see as complete as ours. They see mostly yellows, blues & violets. Red and green look very similar to a dog, so when you throw a red toy into the grass it will be more difficult for your dog to find using their eyes. Dogs pick up on movement better than we do and also have much better night vision.  Here's a great article explaining more about how your dog sees.