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Hello and thank you for using this site to help you. I am not set up for a phone this morning. What she is doing is displaying pain symptoms as many dogs will shake or pant when in pain.
Try checking the anal glands which are located on either side of the anus. Sometimes these get full or sore from rubbing. If you notice a problem there it may be best to have your Vet express them or take a look to see if there is any infection.
These glands usually empty with with a bowel movement but if the stool is not firm enough the sacs remain full and can cause discomfort.