Review scope

This summary is based on the published abstract. We have not appraised the full methods, tables or supplementary material. Details absent from the abstract remain unverified.

Question and design

Four adult female dogs with ileal cannulas; 14-day periods. FOS, MOS or both, each supplied at 1 g per feeding, twice daily. Comparator: The same kibble without these supplements.

What was measured?

Digestibility, microbial populations, protein breakdown products and immune indices.

Main findings

FOS-containing treatments lowered faecal indoles and phenols. Combined FOS/MOS increased ileal IgA versus control. MOS changed some immune and microbial measures; several reported effects were only trends.

Study strengths

Direct intestinal, faecal and blood measurements with a control treatment.

Limitations

Very small, surgically instrumented population; short periods and multiple surrogate outcomes. Related papers may share experiments.

Researchers’ conclusion

The authors suggested possible effects on colonic health and immune status.

Evidence.pet interpretation

These measurements generate hypotheses. They do not show fewer infections, improved disease outcomes or equivalent effects from every yeast-derived ingredient.

Funding and conflicts

Not verified from the abstract; full declarations have not been reviewed.

Source and review date

Swanson KS et al. Study of supplemental FOS and MOS, digestion, microbial populations and immune indices in dogs. Journal of Nutrition. 2002;132(5):980–989. Title shortened; DOI identifies the paper.

Read the primary source · DOI record

STU-028. Reviewed 25 September 2026. Next review 25 December 2026.