Black scabs on dogs may be caused by trauma or skin disease. First, check whether the dog is injured. If the scar is trauma, it will usually heal on its own in a few days. If it is not trauma, it may be fungus. , skin diseases caused by bacterial and parasitic infections, it is necessary to check whether there are parasites on the dog, and bathe the dog in time to deworm the dog. If the situation is serious, you can directly take a medicated bath.