Three stones were removed from the bladder. A follow-up radiograph did not reveal an additional stone. The stones were sent to the laboratory for analysis. The stones were formed of calcium oxalate. Calcium oxalate stones are the most common type of bladder stone in the older cat. It is unknown why some cats form stones and others don't. There is currently no diet available to dissolve this type of stone. However, diets which produce a more alkaline urine (higher pH) may decrease the incidence of recurrence. TagAlong is feeling much better now and is on a prescription diet which hopefully will decrease her chances of forming more stones.