Ask your vet what other foods would be good for the stones, if any. There may be some that are a little better priced. However, I weigh my cost against what it cost me for a month when Oscar had a urinary infection (and VERY few crystals - they vanished the first week he was on the changed food).

In my case, I have both Oscar and Cole on Medi-Cal Dental. it keeps their teeth clean, is a good *ahem* weight-loss food, and my vet had read recent studies that said this formula also prevented crystals.

Depending on what kind of stones Boscoe had, there might be another food he can eat.

Good luck!