A blocked urethra will obstruct urination and must be relieved without delay.

By Tom Ewing

The feline urinary system, like its human counterpart, is an impressively complex arrangement of components. When operating harmoniously and efficiently, it plays a crucially supportive role — directly or indirectly — in all of a cat’s bodily processes.

Any unusual behavior in the litterbox — especially involving urination — warrants observation and prompt veterinary treatment.

The key functions of this system are (1) to filter metabolic waste such as urea, mineral salts and various toxins from circulating blood; (2) to help regulate the volume of body fluids and the blood levels of several important chemicals and hormones; (3) to initiate the recirculation of purified blood throughout an animal’s system; and (4) to facilitate the excretion of the filtered-out waste products (mixed with water to form urine) before…

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