Sarah Jones answers:

It could most like be either demodectic or sarcoptic mange, maybe ringworm. Commonly demodex is common in younger dogs. It has to the with the less exposed immune system. Demodex kicks in when the dogs immune system has been compromised or the dog has been exposed to new or different situations. Demodex is not contagious, in fact every dog has demodex living in their hair follicles. Sarcoptes on the other hand is. Take your dog to the vet and have a skin scraping and a DTM, which is a ringworm culture . That should solve yer problem, good luck!