Described herein are pet food compositions comprising a Camellia extract obtained from the tissue of a tea which is greater than about 40% oxidized; and a fiber component, wherein the Camellia extract and the fiber component are present in an amount effective to provide, after about 24 hours post-ingestion, a fecal hydrogen sulfide concentration of less than 450 mg/L, and a colonic lumen pH of less than 5.0. Methods of making and using these pet food compositions are also described.