How can dogs have different color fur that grows back the same numerous times yet have uniformly colored skin?

Question

For example, German Shepards grow fur in different colors on their body but the skin color is the same.

Answer 1

Here's a site with an extremely detailed discussion of dog *coat* color.
http://bowlingsite.mcf.com/Genetics/ColorGen.html

Wow! I've searched for over an hour, and cannot find a single discussion of dog skin color. Even when I find something that seems to be heading that way, it winds up being a discussion of coat color. Yet I know for sure that the two are not always the same.

I'm going to ask in "Dogs." Meet me there!

Edit
Here's my question:
http://answers.yahoo.com/question/index;_ylt=AgTMhBYDO46UBoaOl8LwmwTsy6IX?qid=20060720151349AAg3GjW

Answer 2

Just a slight correction: the SURFACE of the skin may show little distinction, but the hair folicles are loaded with pigment producing cells. Moreover, while this may be an acurrate assessment of your German Shepard's skin, I'm pretty certain that is NOTthe case for all or even the majority of dogs. For example, my Pappilon has different colored skin pigmentations that follow the black & white blazes of his coat.