Prescription dog food abbreviations:
•I/D-Digestive health
•J/D-Joint health
•L/D-Liver problems
•N/D-Cancer
•R/D-Weight control
•T/D-Gum disease and tooth care
•W/D-Diabetes
•Z/D-Food allergies
From this link:
http://www.vetinfo.com/veterinarian-prescription-dog-food.htmld/d appears to be for skin issues:
http://www.hillspet.com/products/pd-cani...ormula-dry.html 
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