Anyone know if there could be a way of treating their skin condition other than a vet? I guess that won’t be easy… 
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Discussion
How long have they been like this?
Who knows, but I think they are young, there was another batch of puppies there maybe a year ago or so
I think it depends on how easily you can lay hands on them. Looks like mange in the first photo. We used to use Demodex in a bath to treat that. Maybe now there is an Ivermectin product for it. “Mange by mail” has a protocol for adding a specific amount (.1 to .3 ml) of injectable ivermectin to meat bait that’s supposed to cure it. No surprise that any such use is not approved in the official description.
If you can get selamectin or moxidectin without a vet (good luck with that, I’m still trying) it’s an effective topical treatment for mange and all other parasites