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

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

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

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