The presented composition and methods are effective to enhance anti-oxidation, gut flora and immune stimulation in pets. The composition includes a combination of Dihydroquercetin and Siberian or Dahurian Larch Arabinogalactan, more specifically, wherein the Larch Arabinogalactan has a molecular weight between about 9.5 kDa and about 37 kDa. The compositions may be in the form of a tablet, chewable tablet, capsule, resin, oil, liquid, liposome, powder, or suppository, and may be further comprised of a pharmaceutically acceptable carrier； or may be incorporated into a bulk feed or a feed supplement.
