My chahuahua is 3 yrs old, the last week she has been biting at her rear near the tail which has caused her to loose hair down to the skin, what could cause this?

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flea, mites or dry skin can cause this. give your dog a flea bath, should this fail try a bath with 'oatmeal shampoo' and if this still continues - take your dog to the vet to get a treatment for skin mites.