Thanks everyone and like most of you I'm clueless on what is considered right and wrong when it comes to color. Heck, when I first got Trixie I had no idea all yorkies weren't like her.
When I found out about her hair possibly changing I was upset, LOL. I loved how black it was and I didn't want it to change. I guess I got my wish because she's still as dark as ever.
As long as they are healthy, that is all I really care about.