With what you have said mate it could be demodectic mange and its caused by burrowing parasites in there hair follicles.There is a good chance it could clear on its own without treatment, depending how bad it is you could go to the vets and get them to send a scraping of the skin to the lab to be checked out.But iv heard that camrosa ointment is good stuff for promoting good skin condition which is what you need to redevelop hair loss.Go on the website and it should tell you more