These were struvite stones?
I would look at K/D, Purina NF, and maybe even Sci Diet C/D. If Orijen was very good at struvite prevention, then I wouldn't expect to see 7 stones in a bladder. It does not have the correct levels for this issue. Cranberries tend to get good reviews for this sort of thing, but only adidify the urine for a few hours at most and not as well as what people would think. Your pup needs low phosphorus or your vet wouldn't be going with K/D. I'm sure Orijen is much higher.
The quality of meat in Orijen is pretty much the same as most other dog foods (there was a recent thread in Health and Diet about this). It is higher in protein which I know some people prefer, but a high protein diet isn't one of the needed things here.
I think a veterinary diet would be much more appropriate for your pup.
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