From some information provided to me from my holistic vet......but ideally I recommend your friend seek a consultation with a holistic practitioner locally.......   For Kidney Disease;   Protein; Diets should have high energy density, with a moderate amount of protein of high biologic value (15–20% in dogs and 28% in cats). Aim for 2.2g protein/kg body weight daily Phosphorus; Less than 0.4–0.6% phosphorus (dry-matter basis)