Research has found that changes in dog hair are very complex. Even if a young dog's hair color is very strong, it will gradually become lighter as the dog grows up over time. Moreover, "heredity" is very magical. Even if the hair color of the dog's parents is perfect, there is no guarantee that the puppies can inherit 100% of their parents' advantages.

In addition, the change in dog hair color is also related to the climate. For example, in summer, the color of a dog's hair will appear lighter than in winter. We also know whether it is the result of temperature or sun exposure. Maybe it is mainly related to the climate environment.

Discoloration of a dog’s coat may also be due to malnutrition. We know that to ensure the healthy growth of dog hair, sufficient protein, minerals and many other nutrients are needed. If there is a lack of nutrition, the hair will become rough, dull, and the color will gradually fade.

To sum up, there are many reasons for dog hair to change color. If you want to ask why dog ​​hair changes color, the reasons may be genetics, the influence of climate environment, inevitable changes in the growth process of dogs, diseases, malnutrition, etc. These internal and external factors may cause the dog's hair to change color.