Yesterday, I was at the town office registering Malone since he just got his rabies shot last week, and the lady was saying how her daughter is getting a yellow lab puppy in 3 weeks. She then said that the mother dog had 2 black puppies and 1 yellow puppy. Maybe this is a compleltely stupid question, but why don't lab colors ever mix?? I know you can get variations in colors (lighter yellow/darker yellow)...but how come they are always solid???