We have a full blooded rottweiler that developed a rash sort of like that - or at least what I am imagining in my mind from your description. It started out as a few round spots where he lost hair. The first vet I took him too said it was allergies, and the treatment didn't work. So I took him to another vet, and they did a skin scrape and some bloodwork. It turns out he had demodectic (sp) mange - a hereditary mange that is gotten from the parents. However, the parents do not necessarily show the signs, nor do the others in the litter. The mites are present on all dogs, but if the immune system is compromised, the mites grow in numbers and begin to cause problems for the dog. She said it generally only occurs in pure bred dogs. Maybe you should ask for them to check on it?
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