Wayne my wife and daughter were at the local dog pound a few years back when they noticed a sad dog that had no hair. It had mange. The dog was schedule to be put down the next day. My wife couldn’t let that happen so she brought her home. Took her to the vet who described her type of mange as “stress mange.” Said it was brought on not by catching the mange from another dog but being stressed out. He gave my wife some medicine to treat the dog and the dog made a complete recovery. Going from the streets/dog pound to our house didn’t hurt any either. We were just gonna foster her until we could find a good home. Well she found a home alright.....our home. Turned out to be one heckuva dog. No more issues with hair loss. Here is a photo where you can clearly see she isn’t stressing about anything.