wrote in message
ink.net...

Thanks for the info. All he knows is that Casper has blood
in the urine. The urine culture came back negative so he's
assuming that she has a kidney infection.

If the urine culture was negative, an infection seems unlikely.
Interstitial cystitis seems a more likely differential. Blood in the urine
(hematuria) can result from urinary mucosal inflammation,
irritation/inflammation from crystals, or from tearing the bladder mucosa
from straining to urinate (or from overdistention of the bladder in males
with urethral obstruction).

Inflammation in the bladder and/or urethra causes a nervous sensation in
cats that mimics the sensation that's normally induced by a full bladder.
The nervous impulses that control the urge to pee are repeatedly stimulated
so that the cat has the urge to pee whether her bladder is full or empty --
which can make a cat strain to pee... which can tear the bladder mucosa.

Has Casper displayed any symptoms or strain to pee or does she make frequent
attempts to pee with little or no urine?

Phil