Okay, going to try and explain as clearly as I can what the vet said at the vet school because I think it may be of some help to owners who have piggies with the same problem. Here goes..... The vet (nice man!) took a lot of time drawing me diagrams of a normal bladder then Gus's bladder. He said a healthy bladder is like a balloon, nice and stretchy which inflates to hold the urine. Inside it also has a thin lining. Poor Gus's bladder has a really thickened lining which is taking up most of his bladder. This has been caused by the sludge (crystals) rubbing the lining and irritating it. This also explains the bleeding. The crystals rub the lining and cause abrehsions hence the blood in the urine. Am I making sense so far? The vet explained it a lot better but hope your getting the general idea! To try and stop more crystals forming Gus has to have a diet of lots of veg (which he gets) lots of hay (gets that too) but very little or no pellets whatsoever. He's also to get lots of exercise in the chance that theres still sludge there. The idea of this is... well.. he likened it to a bottle of juice whch has bits in it. If the juice is still then the sedement lies on the bottom but if it's shaken before drinking it disperses through the liquid. So if Gus has sedement in his bladder and he's getting exercised then the stuff is being dispersed through his urine which means it will be passed a lot easier. Did that make sense or are you all staring at your computers going 'What?' ? ? Last but not least he's to visit his own vet once a week for a jag to try and help thin down the bladder lining. He's also to stay on Metacam for a while and to continue his antibiotic for at least the next week because, would you believe it, his wound is infected! Couldn't believe it! It didn't look inflamed or weepy or anything! But when he was examining it I seen a tiny wee bit of what looked like pus. The vet didn't notice, it was very tiny, so I spoke up. He gave it a squeeze and it was like a big spot erupting! Even the vet was surprised because the wound looked fine. Anyway as I said he's to attend his regular vet for the next few weeks for his jab so he doesn't need to go back to the vet school. I was really pleased with how Gus was looked after, it cost a fortune oer £500 (thank god for credit cards!) but at least I know what the problem is and how to handle it. Hope I've explained everything clearly and I'll keep everyone updated on his progress. Off to chase him round the room and get any crystals moving through his juice!