Nygee has a cystotomy 2 yrs ago and the stones were calcium oxalate, these new formation are probably the same, but now she's developed kidney stones as well, so we'll be seeing a specialist on Tues. to seek treatment for her... Have you heard anything on cranberry extract? I've been doing research and read up on many testimonials on this... Nygee is showing no sign of anything wrong with her, but I have caught her condition in time to prevent anymore damage... I am extremely concerned, and don't want her to suffer.