Having forked out for emergency operation for unblocking my cats bladder, I now find that he has been put on a special diet of food (only available from the vet), this is to remove the build up of crystals in his urine. Honestly, it would be cheaper to feed him on poached salmon and steak. Can anyone recommend alternatives to the vet prescribed diet. this is doubly expensive for us as we have two cats and they both have to have the same food as it would be impossible to monitor two different feeding regimes.