If you research Shih Tzus and color changes you will find a lot of information on the web. Shih Tzu‘s hair color can often lighten as they get older. Also, color changes can take place while they are still newborns. I have a perfect example of this in the photo below. Remember I said I had a solid black female. Well she know is starting to get a white marking on her chest. Regardless of what color they end up, they‘re all beautiful and doing well!