Dog ringworm is a very common skin disease, and it is highly contagious and easy to relapse. In severe cases, it can cause hair loss. Once the ringworm is discovered, the area with ringworm should be sprayed with medicine to inhibit the germs. Ringworm in dogs is caused by fungal or mite infection, and the treatment cycle is relatively long. The dog needs to be dewormed regularly, the environment should be kept clean and hygienic, ventilate frequently, bathe the dog frequently, and let the dog bask in the sun more to reduce infection.