generalized demodectic mange?

I’m looking at a dog (Pekingese) in a rescue shelter and it has the worst case of demodectic mange I have ever seen. The dog is 8-10 years old and is so bald on her entire body, you would think she is part Chinese Crested. He skin is blackish (maybe normal) so it’s hard to tell what color she really is.

Is it possible to have mange this bad and it not be a hereditary condition? Should I wait to adopt? They’ve told me they will keep treating her until it clears up but I’m concerned she’ll come home with us and it won’t clear up.

Finally she stinks so bad. If she’s getting dips for treatment, can I wash her? I just can’t take the smell.

Thanks
No the they aren’t doing oatmeal baths since they say she can’t be bathed between dips. Also she had a bad reaction to the dip so is being treated at a lower dip solution. There are no plans to treat her with anything except the dip.

are they sure she doesnt have red mange, My pit does.. I was told she layed in insulation but my vet says insulation dont make there hair fall out. We had test run and she has red mange, which is hereditary. she to smelled horrible, regular mange dips didnt work,,,,she looked like she was related to a chinese crested or even Mr. Clean… stress causes the hair to fall out with red mange, such as heat cycles, change of ownership….etc…,,,, we gave her some infection pills and oral ivermectin,,,,but if you do give her oral ivermectin make sure she is heart worm neg,,,,,hope it helps,,,,just tell them youd take her if they can improve her condition,,,or maybe get another opinion.

You can also learn more about Demodectic Mange here.