There are black particles at the root of the dog's hair, which may be due to folliculitis. When a dog has folliculitis, black granular substances will appear on the skin, which is especially common on the dog's tail and the external genitalia of male dogs. At this time, the owner needs to perform anti-inflammatory treatment on the folliculitis area, and then wear an Elizabethan ring on the dog.

Dogs will also have the above symptoms after being infected with external parasites. If there are parasites on the body, especially fleas, it is easy to produce black hard particles. In fact, this is the feces of fleas. You can see it turning red after wetting it with water. . It is recommended to carry out external deworming treatment in time.