Prebiotics are nutrients that feed the billions of microbes in the gut microbiome that are essential for good health. This breakthrough blend of prebiotics, ActivBiome+, supports each pet's unique microbiome for healthy digestion & overall well-being. Hill's Science Diet Adult Perfect Digestion Small & Mini chicken & brown rice dog food uses high-quality protein for lean muscles and has balanced nutrition & minerals for vital organ health. Great tasting natural nutrition for a long, happy life.