I'm sorry to hear of this with Bubbles. The most common cause of hematuria (blood in the urine) is a simple bacterial infection of her urinary tract (UTI). Less commonly, calculi (stones) or transitional cell carcinoma of the bladder/urethra is found. In most cases her vet will want to perform a thorough urinalysis to see if the tell-tale signs of infection are present - bacteria and/or abnormal numbers of either red or white blood cells - and if so, prescribe a broad-spectrum antibiotic for 10-14 days and then recheck Bubbles's urine 2 days after the course of antibiotic is completed to make sure that her urinary tract has been sterilized. Her vet may recommend a bacterial culture and sensitivity in order to determine the very best antibiotic to prescribe particularly if Bubbles's urine is dilute. It's difficult to see bacteria and cells in a urinalysis of dilute urine.
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