Leave it alone if you're not superstitious.
If you are superstitious, cut your hair white. Cut it when it grows up.
I don't approve of cutting off the tail tip of a puppy. It's cruel. It's really not his fault that the dog's tail is pointed and white.
It is normal that the tip of the white tail is white. For example, there are many varieties of white tails, such as Su Mu, which even has typical "seven whites" characteristics, namely, white socks, white collar, white nose (leading to the white collar at the back) and white tail tip.