SO Diet Food

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Our 3 year Moggle just had a lovely all inclusive stay at out local vets and had a bladder procedure at vast vast costs (which is a story for another day but out of pocket for the tune of £5000!!! Which is absolute BS) anyway it appears he will need the SO Diet going forward.

Royal Canin and Hills are being the ones the Vet recommends but is there an alternative as costs seem to vary on these.

Any thoughts?