What medicine should I use for white dandruff on my dog?

White dandruff on a dog does not always require medication, because it can be a normal sign of physiological metabolism, usually tied to an overly dry environment or bathing too often. You can supplement the dog’s skin nutrition with lecithin or fish oil, and make sure baths do not exceed once a week using a pet-specific shampoo.

If, besides dandruff, the dog also has heavy shedding, itching, or similar symptoms, take it to a veterinary hospital for a skin scraping test to determine whether the skin problem comes from a fungal, bacterial, or mite infection or a hormonal imbalance, then use the right medication promptly.