• Thanks for the advice, I’ll look into it. Yeah, the deal is that the kidneys filter out toxins, so when they stop working well anything in the good can build up in the blood. Phosphorus is among the more problematic things, but not the only thing.

    Mine just turned 16, and she’s doing well on the prescription diet. She gained like 2.5 pounds since late last year (I thought she was getting skinny because she was old - didn’t realize she had kidney problems and wasn’t eating her dry food).