Our Guinea Fowl Formula is packed with lean protein and low in saturated fat. It is also rich in iron and phosphorous. Guinea Fowl is also a novel protein source, so it could be a great way to start an elimination diet for dogs who have sensitivities to certain meats, such as chicken. Our Guinea Fowl Formula is also grain-free and balanced with low glycemic carbohydrates to keep your dogs healthy and strong. Zignature Guinea Fowl Formula – Learned from Nature, Crafted to Perfection.