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I am going to opt out of this question as I have not seen any sort of skin parasites that can affect multiple species and seem adherent to hair like you are seeing.
Please don't respond or it will come back to me.
I hope that another veterinarian on the site has some experience with this sort of parasite.
My name is***** Is your dog still battling this issue? Do you have any photos you could attach for us to further evaluate the situation?