1. Regular grooming: Regular grooming of dog hair can prevent knotting and dry skin. It is recommended to comb once a week. Use needle comb and row comb, first reverse comb, then straight comb to keep hair healthy and fluffy.

2. Bathing regularly: Bathing dogs helps to keep skin and hair clean and healthy. However, it should be noted that you should not take an excessive bath, so as not to destroy the natural barrier of the skin.

3. Pay attention to diet: the dog's diet has a great influence on hair health. It is suggested to choose dog food containing high-quality protein and Omega-3 fatty acids, and some fish oil and lecithin can be added to moisten hair.

4. Exercise regularly: Dogs need enough exercise to keep healthy hair. Proper exercise can promote blood circulation and help keep hair healthy and bright.

5. Keep the living environment clean: Keeping the dog's living environment clean will help reduce the occurrence of skin diseases, thus keeping the hair healthy.

In short, regular grooming, reasonable diet, proper exercise and keeping the living environment clean can effectively help dogs keep their hair healthy and beautiful.