...So, to maximize an object's visibility to a dog, we should strive to combine: (1) moderate motion (when feasible); (2) maximal contrast (a dark and white pattern unlike that of the background scene); and (3) stand-out color (one that is identifiable by dogs and does not occur very often in the background scene). The best of all possible worlds for most background scenes would be boldly-patterned Bright Purple and White objects.
http://www.puplife.com/dogcaretips/h...seecolors.html
I found the above info. Hope it helps some!
