What Causes a Mucous Plug?

Diet may help avoid recurrence of this urinary issue

Q: My 15-year-old female cat probably has feline idiopathic cystitis, which may be due to anxiety. Last summer, the vet saw what he thought was a struvite stone in her urinary tract and said she may need surgery. I tried switching her food to a diet to help dissolve struvite stones, but this was not successful, and there came a time when she became reluctant to use the box, meowed a lot when going, and wasn’t urinating in her usual position. We had the surgery in December, and no struvite stones were found in her urinary tract, but she had a mucous plug in her urethra. Since then, she has been fine. Do you know what caused a mucous plug? Will it return?

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