Ringworm and scabs on dogs are caused by fungal or mite infection. It is a common skin disease and can be cured by spraying the affected area regularly. The treatment cycle for ringworm is relatively long and it is also highly contagious. Therefore, once a dog is found to have ringworm, it must be treated promptly to prevent the ringworm from spreading to the whole body. You only need to spray the local area. If there are many areas with ringworm, you can choose Medicated bath.