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I would go back to ethology. What is normal for the breed and what is abnormal? Consider her age, sex, and if there are other dogs in the home. (I do not know any of these). I would ask myself why does she feel she needs to be showing such a dominant stance? Who is in control of limited resources?
Another factor would be health. Does she have some type of injury that causes pain when she drops her tail?
It’s only a problem if it is causing you a problem.
