Yeah, I concur, sounds like FUS. I have a chronic FUS boy- usually clears up with some antibiotics, pain killers, and finding the right food (for us, it was Hill's prescription diet). The other thing my newer vet has him on is a Cosequin everyday. For some reason even though the urinary tract and bladder are not joints, the cosequin keeps the inflammation down. Weird, but I went from issues every 1-3mos with him to every couple of years, which is much better!