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The anal glands when expressed need to be done internally and externally. If the groomer did not do them properly is could cause discomfort. For this issue you can try some warm compresses on the anal area, followed by using some Neosporin. There may also be a razor burn if the groomer got to close. To make the dog more comfortable, I would give 1 mg of plain benedry per pound of body weight to see if it stops the digging and relaxes the dog. I would use a teaspoon full of canned pure Pumpkin, not pie filling to help regulate the stools as well as aiding the anal glands with the passing of stool.
I would see the Vet today and have him take a look at the anal glands to make sure all were done correctly or if they need to be done internally.