How would I go about finding out how much Phosphorus is in a serving (1 cup) of Orijen Senior? I have a little dog that is supposed to be on a low soduim and low phosphurus diet. He has CRF & CHF. I don't want to do the prescription diet that my vet recommends because I think it is too low in protein and not palatable. I am currently feeding Orijen Senior and I need to find out if it is low enough in phosphorus content to continue feeding...I am switching to distilled water because there is evidently a lot of phosphurus in tap water...I am also currently cooking for the little guy. Recipe's are welcomed because he gets tired of the same thing all of the time. Since I am dealing with a passle of seniors, I may as well try to lower the phosphorus as much as possible for everyone. Any suggestions?