I have not had experience with a cat having calcium oxalate crystals but I did have them myself. This is what is known as a kidney stones in people. Mine came from two components, eating a lot of green leafy vegetables and not drinking enough water. The lack of enough water was really the main reason because the diet would not have been an issue if I had been drinking enough.
http://www.veterinarypartner.com/Content.plx?P=A&A=1741





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