C
I tagged you in this also but this is what my vet said about Tank only by looking at pics....kinda hard for them not actually seeing him...didn't know if your vet did all these tests or not! Good Luck!! I hope you figure this out and your don't have to put your baby down 
Sounds like a tricky case Megan. I would probably recommend biopsies of the skin, skin scrape for mange (possibly treat for mange even without a positive diagnosis), liver biopsy. A referral to a dermatologist would also be a great idea. I wouldn't recommend any of these things without seeing the dog first, of course. However, these might be some ideas to bring to her vet if they haven't been talked about already.
Thanks,
Tom
Sounds like a tricky case Megan. I would probably recommend biopsies of the skin, skin scrape for mange (possibly treat for mange even without a positive diagnosis), liver biopsy. A referral to a dermatologist would also be a great idea. I wouldn't recommend any of these things without seeing the dog first, of course. However, these might be some ideas to bring to her vet if they haven't been talked about already.
Thanks,
Tom