Bloody urine in litter box: How to identify which of my cats is sick?

Question

I have three cats. I just noticed we have bloody urine in a litter box, but don't know which one of them it is from. I received a flower arrangement with lilies in it and I know two of them sniffed it before I realized that it was poisonous. That was on Saturday. The urine wasn't until the last six hours, though. How can I tell who it is and what to do? Pet's info: Cat | Mixed Breed | Female | spayed | 10 lbs

Destini R. Holloway, DVM · Accepted Answer

Well I wouldn't expect any of the cats to be sick from the lilies if they just sniffed it and didn't actually ingest any of them. So that is not a concern, especially if you don't see any other overt signs of lily toxicity which would include vomiting, lethargy and a lack of appetite. However a cystitis or UTI is a possible cause of the bloody urine. One good way to determine which cat is responsible is to isolate one cat at a time in a small room with a clean litterbox in it for a day, then monitor the urine output for blood. Another thing you could do is to gently palpate (feel) the cats bladder (lower abdomen) to see which one seems uncomfortable or painful. You could also try to monitor the cats for 1 hr duration to see which one is constantly going to the litterbox. Chances are the one that is affected is going many times within the hour and will be noticeably drinking more water as well.

Bloody urine in litter box: How to identify which of my cats is sick?

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