Demodectic mange is an opportunistic infection because the immune system is weak. I would bathe with DEFENDEX shampoo once weekly for 4-6 weeks or a couple of weeks past having a negative skin scraping. I would also use DERMA-IONX to heal and soothe the skin as well as rebuilding the immune system. Giving digestive enzymes, probiotics, vitamin C, MSM, and Omega 3,6,9 will all help in that goal. DERMA-IONX also helps the body to better utilize the supplements. It is easy to give by adding it to the food or water. I prefer to add a half dose to the food twice a day on the food.
Please let us know how you progress or if you have any other questions.