My 9-year old Maltese, Maggie, has had a droopy tail for a few months. She is also very protective of her rear and tail area and yipes occasionally when touched there, or even sometimes when I pick her up. She also suffers from low-grade kidney disease, for which she has been taking benazepril and aluminum hydroxide. Aside from the droopy tail and yiping, her activity level is normal. She still jumps, runs, eats, poops, and urinates fine. Her anal glands were cleared, and she had a rectal exam. My vet felt it may be a nerve issue and prescribed gabapentin. So far, no change. Any thoughts?