has he been nuetered yet? and you don't have to get a sample of urine necessarily- they can extract right from the bladder with a special needle that allegedly doesn't hurt (just your pocket!) and can do a urinalysis. Boys get utis and, at least with mine that have had them, don't show pain. Just go often in small amounts or none- I'll bet it's different symptoms with different cats and I'll bet there are all kinds of bladder and kidney ailments out there too!