There are black dots at the roots of the dog's hair, which is usually a fungal infection. In this case, you can use a medicated bath shampoo to prevent the dog from aggravating the skin disease. You can take it to the pet hospital for examination and diagnosis to see if it is caused by a skin disease or natural pigment.

Dogs will also have the above symptoms after being infected with parasites, such as fleas. It is recommended to undergo external deworming treatment. Use external anthelmintics such as Fulian and Da Chong Ai and drop them on the roots of the dog's hair. Be careful to prevent your dog from licking the potion, and it is best to wear an Elizabethan collar.