The reasons why Labrador has white hair:

1. Heredity. If the genes of parents or ancestors contain white hair, then the white hair is usually caused by atavism or inheritance, which is the result of pigmentation.

2. Older. As age increases, metabolism slows down, hair pigmentation also slows down, and hair color becomes lighter or even completely white.

3. Malnutrition. Eating human food for a long time, because human food contains too much salt and condiments, is not very friendly to the dog's hair, which will cause the hair color to become lighter and become boring and messy.

4. High pressure. Dogs may also grow white hair if they move frequently, lack exercise or change owners, but as long as you take your dog out to play regularly, it can be improved.

5. Insufficient amount of exercise. If the dog is not given the appropriate amount of walks or exercise, it will also cause the dog to accumulate stress.