Hill's Prescription Diet k/d Kidney Care Cat FoodHill's Prescription Diet k d Kidney Care Cat Food Hill's nutritionists and veterinarians developed Hill's Prescription Diet k d clinical nutrition with ActivBiome+ Kidney Defense, a proprietary blend of prebiotics shown to nourish the gut microbiome to help support kidney function. Prescription Diet k d is also formulated with Enhanced Appetite Trigger (E. A. T) to stimulate appetite and increase food intake. This dry food is made with chicken and has