Probably red mange or demodectic. The vet will probably tell you to have the dog fixed and to start a treatment that cost mucho $$$$. I HAD a dog with it and i fixed him.....
If you want to try something first, get some tactic from the feed store delute it and pour it on. That stuff will kill any mite that is causing a problem. The problem with red mange is it will come back. But the tactic will knock the mites out for a while. The dog will not be a good dog for breeding though if it is red mange. Good luck
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