A dog's skin that keeps losing dandruff may be caused by skin diseases, abnormal oil secretion, malnutrition, dry skin, etc. It is best to go to the hospital for examination first to confirm the cause before treatment. Usually, you should pay attention to a balanced diet, do not feed your dog too greasy food, let your dog drink more water, bathe your dog regularly to deworm and maintain hygiene, and blow dry the hair after bathing to avoid the breeding of bacteria and fungi.