The addition of FOS to feline diets at 0.75 % (DM) did not affect
duodenal flora, but it did increase the numbers of lactobacilli and
reduce the numbers of E. coli in the fecal flora of healthy cats.24, 25 Healthy German shepherds believed to have bacterial overgrowth were supplemented with FOS at 1.0 % (AF) of their diet.26 Changes were recognized in the
duodenal bacterial flora but these changes were of less magnitude than seen in normal dogs for these parameters.