My 18 month old black gsd has a small area on her knee that was recently diagnosed as demodectic mange. I actually got to see the little bugger under a microscope, yuk. She also had a pencil eraser spot on her jaw, which since her vet visit. a week ago has healed. I need to know if this would be considered localized and juvenile onset, which is my deduction from the info I have found so far. My vet advised to get her spayed due to this condition being passed from dam to pup. Is it an immune deficiency? If so, what can be done to strengthen it. I have also found info that states stress may be the reason for the deficiency or possibly diet. I have not started her on the systemic med yet and not one more hair has been lost on her knee or any new spots. How long should I wait for her immune system to repair this spot? Will the hair ever grow back? Please help me decipher the info on the web. I will appreciate any help and all input.