White hair on black teddy dogs may be caused by genetic inheritance, improper diet, or aging. Generally, it will not affect the dog's health, so don't worry. If the Teddy dog ​​has white hair when he is a puppy, it may be genetic; if it is a youngster, you need to pay attention to the dog's diet, do not give the dog too much salt, and eat some lecithin, egg yolks, and hair care products appropriately. Powder can make hair healthier.