Well, Jasper has been having another bout of cystitus so I booked him in for an x-ray thinking it was probably a stone. It was, it's about the size of a fat grain of rice. The vet doesn't want to operate at the minute because he also showed some small crystal like masses in his left kidney. She wants to make sure he has full kidney function before putting him through an op as his wee was quite diluted, though that could have been all the cucumber and water to try and get him to give a urine sample. Has anyone got any experience with renal problems? Is there anything I can do dietary-wise apart from the low calcium diet he's already on? The vet is thinking if he has full kidney function of removing the stone and then giving me metacam for him for when those tiny crystals in his kidney move as this will be just as painul for him as it would be for humans.