You're welcome! Yeah, sometimes it can be a gene related thing, other times it can be because of the actual area that they have come from, out in the wild. With my Labs, the nasty black beard will come out when there's a bit of bullying going on, and the male is feeling a bit cranky. Sometimes, if they're a bit stressed out, they can get some darkish coloured bars down thier sides too.
Three-fourths of the Earth's surface is water, and one-fourth is land. It is quite clear that the good Lord intended us to spend triple the amount of time fishing as taking care of the lawn. ~Chuck Clark