A. In order to successfully treat alopecia, one needs to know why the dog is losing the hair. Causes could be parasites (fleas, mites), a fungal infection, bacterial infection and /or an allergy. So the best would be for you to take her to a vet for an exam. The vet may want to do a skin scrape to help with the diagnosis. Each of these causes needs a different treatment, so there is no one answer, I am afraid.
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