Silver shaded dogs' coats will naturally turn whiter as they age. You can regularly feed them foods that are good for their coat, such as cooked egg yolks and beef, to help their coat turn whiter. At the same time, avoid feeding them oily or salty foods that can damage their coat.

First, as they grow older, the British Shorthair's silver shaded coat will gradually spread out and become less concentrated, so the color of the coat will become lighter and lighter, eventually turning whiter – this is a natural process.
Secondly, you can feed your silver shaded cat some foods that are good for its coat, such as coat-enhancing cat food, cooked egg yolks, and beef. Feeding these two or three times a week can also help whiten its coat.
At the same time, it is important to avoid feeding your child anything that could damage their coat. Oily or salty foods are not recommended as they can harm the coat and hinder the silver shaded coat from turning white.