Liz Buchanan BVSc MRCVS
Keymaster
Hello! I'm afraid that I don't know what this is, but you sound to have got a good look at it. I wonder whether you could use an empty litter tray (ie without litter) to catch some urine, and have your vets check it out with urine strips / a microscope (as fresh as possible). Whatever you are seeing, it sounds important to find out.
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