did the vet tell you its demodectic mange or sarcoptic mange?
sarcoptic mange is the one that's very infectious,all humans and animals can get it.
our dog had demodectic mange,didn't respond to any other treatment except Ivermectin for farm animals(yes,all farm animals able to get mange).Make sure,you order the Ivermectin that's the oral medicine,as there are injectable forms too!
It is given by weight:check your dogs weight,round it up,not down.
Order Ivermectin also called Ivomec from any farming supply.
i know this one:www.jefferspets.com
did the vet do a skin scraping and look under a microscope?
Mange is tiny mites that burrow into the skin.
is the dog itching like mad? =sarcoptic mange
not itchy,small spots on face,around eyes,around lips=demodectic mange