Male cats are prone to urinary blockage. The urethra of a male cat is very small, and it can become fully obstructed by crystals, bladder stones, or inflammation. When an animal cannot pee, it must be seen by a veterinarian immediately. If you notice your pet straining to get little or no urine out, call the hospital now @ 610.323.9454. Clearing the obstruction is only half of the fight when cats become blocked. They typically must have a urinary catheter placed for several days in order to allow inflammation to decrease and to clear out urinary crystals.