Oh, poor little Bella! We just went through this with Gem. She had an anal gland that was just about to rupture. She wasn't her usual perky self, but other than being unusually quiet, there weren't any other signs. She wasn't scooting and I never saw her licking. (We were actually competing at an agility trial). I noticed her licking her bottom (for the first time) and when I checked where she was licking, I saw her huge red gland. I took her immediately to the vet and he had to lance the gland. If you don't need to lance, it would be best to wait. Gem had to wear an e-collar for about a week, she was on antibiotics and painkillers. I had to put warm compresses on her lanced gland twice a day and put an ointment on the cut. Hopefully Bella will start to feel better really soon. I am trying to be more vigilant in checking behinds now.
J. and pups, Gem, Monty, Harley and Sapphire