This is a medical emergency! Male cats can develope urinary tract infections fairly easily. Crystals form in the urine and will block the opening to the urethra and he will be unable to urinate. When this happens, urine will back up into the bladder and it will rupture if he is not catheterized before that happens. It doesn't take long for a bladder to rupture in a cat. Females, while it is important they get care also, will not totally block as the opening for their urine to pass is much larger. Since you have a boy, PLEASE get him into the vet TONITE as this is concerned a medical emergency. If you had a girl, you could safely wait until tomorrow, but she would need to go also. Your vet will catheterize your cat and put the him on antibiotics and probably suggest a new diet for urinary tract health. Please let me know how your kitty is doing as I am extremely concerned!
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Lori McLaughlin
Your veterinarian should ALWAYS be consulted first and foremost when your pet's welfare is at stake.