Hi Emma,
Sorry to hear about your dog. Pet Diet Designer for Windows (PDD) is designed for healthy dogs and cats. However, many of our clients use it to design recipes for disease conditions. You have to know what you are doing. We are coming out with 2 new versions of our product (Plus and Pro) that will let you design recipes easily for disease conditions. We will start out with the most common diseases that can be managed nutritionally and keep adding. Chronic Kidney Disease (CKD) will be one of the first.
Since renal damage is irreversible, the goal of nutritional management in Stage III/IV disease is to alter disease progression and control uremic symptoms. Protein should be reduced to the minimum requirement. Phosphorus must be reduced. Calcium, sodium, chloride, magnesium should be at normal levels (not much higher than 100% in Nutrient Summary when balancing for minimum requirement).
Calcium : Phosphorus ratio should be in the green area.
You should work closely with your vet. Recipes will probably have to be altered depending on results of diagnostic tests.
Here is a good page discussing the nutritional management of this disease, along with some recipes to get you started:
http://www.dogcathomeprepareddiet.com/diet_and_chronic_renal_disease.html
Hope this helps.
Rene
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