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Hi, this is Dr. Hill. The hair loss is likely from irritation associated with her licking. There are glands on either side of the anus are expressed with a formed bowel movement. If the stools are softer than normal or if Bella has allergies, she may have inflamed anal glands. Inflammation will cause her to lick at the area and create the hair loss. I recommend that you put an elizabethan collar on her. You want one long enough that her nose doesn't stick out past the end of the collar. Will mild inflammation you can do a warm, wet epsom salt compress for minutes twice daily. If you note a bulge on either side of the anus, or Bella just can't get comfortable then you need to have her seen by your local veterinarian. Feel free to post additional questions.
Your welcome. Hope Bella feels better soon.