It's a myth! Kind of.
While our vision isn't as good as theirs, we are able to see hundreds of thousands of colors due to many cones our retinas. Dogs only have two, much like colorblind people who cannot see reds or greens. Toys are a must-have for your pal ... but ... due to their eyes, they don't see green very well. While dogs can only see one or two colors, their superhero night vision makes up for it! So, next time you are at the pet store, be sure to buy a few red toys or a red leash. They'll thank you for it.