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Hi there and thanks for allowing me to try to help!
If this is true that your gal has a "pinched sciatic nerve, the use of stronger antiinflammatory agents or steroids will help release this nerve to restore function. If this is due to a Degenerative Myelopathy or a demyelination of this nerve, there is no treatment. The best thing to do is find out exactly why your dog is having this problem. It could be a disc issue in her back or an injury to this part of her nerve. These would rspond to stronger meds.