How do you get a white pup in WolfQuest

On Slough Creek, aka the second Wolf Quest, you get a white pup by either you being white furred, or your mate being white furred. Or of you both have white fur, all of the pups will be white. But if just you or your mate is white, and your mate or you is a different color like orange or black, you will have one or more white pup(s) and (whatever your mates' fur is) you will have one or more pup(s) with that color.