What should I do if my Bichon Frise's fur turns yellow?

Possible causes:

Nutrition deficiency: If your Bichon Frise has been fed a single type of food or low-quality dog food for a long time, it may lead to malnutrition and cause its fur to turn yellow. Ensure that your dog's diet is balanced and includes high-quality dog food, as well as additional nutrients like chicken breast, egg yolk, fruits, and vegetables. Avoid feeding your dog human food, as it may contain excessive salt, which can also cause fur discoloration.
Long periods without bathing: If your Bichon Frise hasn't had a bath in a long time, its fur may turn yellow due to oxidized sebum secretion. Regular bathing with pet-specific shampoos and immediate towel drying can help prevent this.
Impure bloodline: Some Bichon Frises may have a mix of yellow and white fur due to genetic factors. This is a natural occurrence and cannot be changed. Be cautious when purchasing a dog to avoid this issue.
Ageing: As your Bichon Frise gets older, its fur may turn yellow, which is a normal physiological phenomenon. You can improve its fur condition by feeding it foods rich in phosphatidylcholine, such as egg yolk and carrots.

Additional tips:

Spend more time taking your Bichon Frise outdoors for sunlight exposure, which can help improve fur texture and increase its immunity.
Use pet-specific grooming products to maintain your dog's fur health.

Remember to consult with a veterinarian if you have any concerns about your dog's health.