1. Egg yolk: Egg yolk can precipitate coat color and improve hair quality, but the egg yolk must be cooked and the owner needs to break the egg yolk into pieces.

2. Seaweed powder: Seaweed powder is rich in vitamin D and vitamin E. It is very effective in preventing hair loss and fading, brightening hair color, and is also helpful in promoting new hair growth.

3. Lecithin: If you want to make the dog's hair brighter, the owner can also feed it lecithin. Just mix the lecithin into the dog food when feeding.

4. Bone and meat fish: Salmon has the effect of beautifying hair, and bones and meat food can feed dogs with protein, which is also good for hair growth. Dogs can also eat some regularly.

5. Vegetables: You can feed vegetables such as carrots and cabbage. Cabbage contains vitamins and fiber, which can increase the hair volume of dogs. Carrots are rich in vitamins, and vitamin A is important for maintaining the hair of dogs. The shiny texture of the hair plays a role.

6. Olive oil: The unsaturated fatty acids in olive oil are called nutrients for skin and hair. You can occasionally add a little olive oil to dog rice.

7. Cod liver oil: Cod liver oil for dogs contains polyunsaturated fatty acids, which can restore the normal permeability of capillaries and increase capillary tension.

8. Nutritional products: Additional nutritional supplements for Golden Retriever dogs, including dog-specific nutritional pastes, milk cakes, canned meats, and foods rich in high protein.

9. Anthelmintic drugs: If a dog has parasites in its body, it will lead to nutritional deficiencies and poor coat color. Regularly giving the dog anthelmintic drugs can also help the golden retriever's coat become better.