If your cat has been trying to urinate more frequently and straining in the process yet does not test positive for any disease that could lead to such symptoms, she may have what some veterinarians have historically referred to as feline idiopathic cystitis. It’s an illness diagnosed by veterinarians when they can find no other cause for the problem, which may also include leaving streams or puddles of urine outside the litter box and perhaps even urine tainted by blood.
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