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Hello. Thanks for the question.
This chewing at the tail and feet is a common sign of allergies in dogs. The most common cause is flea allergies. If she's not on a monthly flea preventative, that would be my first recommendation.
If she's on a flea preventative, then it may be an environmental allergy. These can be to many things- pollens, grasses, ect. To help with the signs, you can give Benadryl at home. The dose of Benadryl in dogs is 1-2 mg per lb body weight. It can be given up to every 6 hours.
Going forward, I would consider allergy testing and immuno-therapy if the signs turn out to be more chronic. This is the best way to deal with allergies in dogs.
I hope this helps, let me know if you have any other questions.