Prebiotics (FOS & MOS)
Dietary fibres that feed beneficial gut bacteria. Studies show shifts in the gut flora; the effect on stool quality is less well supported.
What is it?
Prebiotics are non-digestible dietary fibres that serve as food for beneficial bacteria in the gut. FOS (fructo-oligosaccharides) and MOS (mannan-oligosaccharides) are two common types in premium dog and cat food.
Why does it matter?
A balanced gut flora supports stable digestion and regular stools. For sensitive pets, a formula with prebiotics can help keep the gut environment calmer, without you having to combine separate supplements yourself.
How does it work?
FOS is largely fermented in the large intestine and stimulates growth of beneficial bacteria such as Bifidobacteria. MOS can bind to harmful bacteria and thus reduce load on the gut wall. Together they support a healthy gut ecosystem as part of a complete diet.
Benefits
- Supports beneficial gut bacteria in daily nutrition
- Helps with stable digestion in sensitive pets
- Fits formulas for dogs and cats with sensitive stomachs
Misconceptions
Prebiotics are not probiotics. They do not add live bacteria, but feed what is already there. More is not always better; a thoughtful dose in complete kibble is more effective than loose powders on top.
FAQs
Sources
- Swanson KS et al. (2002). Supplemental fructooligosaccharides and mannanoligosaccharides influence immune function, ileal and total tract nutrient digestibilities, microbial populations and concentrations of protein catabolites in the large bowel of dogs. J Nutr. 2002;132(5):980-9. doi:10.1093/jn/132.5.980 (PMID: 11983825)
- Middelbos IS et al. (2007). A dose-response evaluation of spray-dried yeast cell wall supplementation of diets fed to adult dogs: effects on nutrient digestibility, immune indices, and fecal microbial populations. J Anim Sci. 2007;85(11):3022-32. doi:10.2527/jas.2007-0079 (PMID: 17644789)
- Kanakupt K et al. (2011). Effects of short-chain fructooligosaccharides and galactooligosaccharides, individually and in combination, on nutrient digestibility, fecal fermentative metabolite concentrations, and large bowel microbial ecology of healthy adult cats. J Anim Sci. 2011;89(5):1376-84. doi:10.2527/jas.2010-3201 (PMID: 21216981)
- Wilson SM, Swanson KS (2024). The influence of 'biotics' on the gut microbiome of dogs and cats. Vet Rec. 2024;195(S2):2-12. doi:10.1002/vetr.4914 (PMID: 39545542)
