Thanks Caz and Kazzo for the diet tips. Unfortunately the stones Winston has are the ones not related to diet. I think the vet said calcium oxidite stones?? or something like that so unfortuantely there is nothing they can do or tell us to do to prevent it happenieng in the future. That is probably the worst thing about it as if we could do something to prevent this we would This type of stone is also not common in Australia so they will send the stones off to the USA for further testing as it is more of a common one over there.