Every cat has an entire ecosystem living within them the gut microbiome, full of billions of diverse microbes unique to a pet. With the right nutrients to help balance their microbiome, you can actually affect not only their digestive health, but their overall well-being. That's why we developed Hill's Science Diet Adult Perfect Digestion Salmon & Brown Rice Recipe dry cat food with our ActivBiome+ Technology ingredient blend of prebiotics. It's a breakthrough nutrition that supports each cat's unique gut microbiome for healthy digestion and balanced nutrition that helps cats feel their best.100% Manufacturer Satisfaction Guaranteed