Natural Ultramix Indoor Cat Food Ideal for adult indoor cats and adult cats with low activity levels or a little extra weight, through their senior years. Cats are obligate carnivores, which is a fancy way of saying they need and crave animal-based proteins in their diet. This cutting edge formula contains proprietary Carnivore Health Boost kibble. These dark, hearty, grain-free bits contain multiple sources of animal-based protein - natural chicken, turkey and salmon - that deliver essential nutrition. These bits are blended with a second carefully crafted kibble to create a complete, balanced (and tasty) diet for your cat. Available in 2.75 lb., 5.5 lb. and 15 lb. bags.