Fructo-oligosaccharides (FOS)

Ingredient record found in evidence.pet/ product ingredient information. Source products linked; evidence review pending.

Ingredient Directory / Ingredient record

Ingredient record

Fructo-oligosaccharides (FOS)

“Fructo-oligosaccharides (FOS)” appears in the ingredient information of at least one indexed pet food. Preparation, inclusion amount and the rest of the formulation can differ between products.

Functional ingredientsNamed ingredientDog CatEvidence review pending

How to read this entry

We classify this term as named ingredient in the functional ingredients category. The linked products supply the observation; they do not by themselves establish the ingredient’s nutritional effect.

Check the declared form and amount, and whether any claim concerns this ingredient alone or a tested complete product.

Evidence status

This is an ingredient index entry linked to product information. We have not completed an ingredient-specific research appraisal for this entry. A term’s presence in a product does not demonstrate a health outcome, nutritional adequacy or the effect of that product.

Source and review

Product ingredient sections checked 24 September 2026. The linked product records show the wording and available source context. Manufacturer formulations and labels may change; verify the current pack and the intended market.

Research on this ingredient

Dog

FOS and MOS in dogs: digestion, microbes and immune markers

One study with 1 reviewed arm or dose connection(s).

Arm fos-supplement

FOS and MOS in dogs: digestion, microbes and immune markers

Direct · dog. Four adult female dogs with ileal cannulas; 14-day periods.

Tested form: FOS supplied at 1 g per feeding, twice daily. Dose: 1 g per feeding, twice daily (Oral feeding supplement). Duration: 14-day periods. Comparator: The same kibble without these supplements.

Measured finding: FOS-containing treatments lowered faecal indoles and phenols. Combined FOS/MOS increased ileal IgA versus control; several reported effects were only trends.

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

Abstract reviewed · Checked 25 September 2026 · Evidence.pet study summary · Primary source

Protein level changes the response to FOS in dogs

One study with 1 reviewed arm or dose connection(s).

Arm fos-in-protein-factorial

Protein level changes the response to FOS in dogs

Direct · dog. 12 healthy adult dogs in a replicated four-treatment Latin square.

Tested form: Fructo-oligosaccharide (FOS) added to lower- and higher-protein foods; inclusion level not reported in the reviewed abstract. Dose: Not reported in the reviewed abstract (Food inclusion; amount not reported). Duration: 28-day periods with washouts. Comparator: Corresponding unsupplemented foods.

Measured finding: Higher protein and FOS each increased faecal ammonia. FOS increased apparent digestibility of several minerals; protein level modified some FOS effects, including bifidobacteria and protein digestibility.

Limitations: Faecal measurements are surrogate outcomes. Small healthy population; no disease-treatment endpoint.

Abstract reviewed · Checked 25 September 2026 · Evidence.pet study summary · Primary source

Products listing or mentioning this ingredient

120 products linked through reviewed ingredient occurrences from manufacturer declarations or partial editorial summaries. Whole-label verification may remain pending. An ingredient’s presence alone does not establish a nutritional outcome.

  • Dry Adult Dog Food Rich in Turkey & Veg Dry Adult Dog Food Rich in Turkey & Veg - Dry Adult Dog Food Rich in Turkey & Veg; United Kingdom; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Eden Country Cuisine Cat Wet Food Eden Country Cuisine Cat Wet Food - Eden Country Cuisine Cat Wet Food (UK); UK; manufacturer declaration Cat; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Eden Original Cuisine Cat Wet Food Eden Original Cuisine Cat Wet Food - Eden Original Cuisine Cat Wet Food (UK); UK; manufacturer declaration Cat; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Eden Turkey & Herring Cuisine Cat Wet Food Eden Turkey & Herring Cuisine Cat Wet Food - Eden Turkey & Herring Cuisine Cat Wet Food (UK); UK; manufacturer declaration Cat; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Eden Wet Food for Sporting & Working Dogs: Country Cuisine Eden Wet Food for Sporting & Working Dogs: Country Cuisine - Eden Wet Food for Sporting & Working Dogs: Country Cuisine (UK); UK; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Eden Wet Food for Sporting & Working Dogs: Original Eden Wet Food for Sporting & Working Dogs: Original - Eden Wet Food for Sporting & Working Dogs: Original (UK); UK; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Eden Wet Food for Sporting & Working Dogs: Turkey and Herring Eden Wet Food for Sporting & Working Dogs: Turkey and Herring - Eden Wet Food for Sporting & Working Dogs: Turkey and Herring (UK); UK; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Essential Foods BALANCE PÂTÉ, 400G Essential Foods BALANCE PÂTÉ, 400G - BALANCE PÂTÉ, 400G (UK); UK; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Essential Foods OUR FINEST BEGINNING SMALL BREED WORKING, 10KG Essential Foods OUR FINEST BEGINNING SMALL BREED WORKING, 10KG - OUR FINEST BEGINNING SMALL BREED WORKING, 10KG (UK); UK; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Essential Foods OUR FINEST BEGINNING SMALL BREED, 10KG Essential Foods OUR FINEST BEGINNING SMALL BREED, 10KG - OUR FINEST BEGINNING SMALL BREED, 10KG (UK); UK; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Essential Foods SUPERIOR WORKING & SPORTING, 12KG Essential Foods SUPERIOR WORKING & SPORTING, 12KG - SUPERIOR WORKING & SPORTING, 12KG (UK); UK; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Farmina N&D N&D Prime Dog Lamb/Blueberry Mini Farmina N&D N&D Prime Dog Lamb/Blueberry Mini - Farmina N&D N&D Prime Dog Lamb/Blueberry Mini; United Kingdom; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Farmina N&D N&D Pumpkin Dog Chicken/Pomegranate Medium/Maxi Farmina N&D N&D Pumpkin Dog Chicken/Pomegranate Medium/Maxi - Farmina N&D N&D Pumpkin Dog Chicken/Pomegranate Medium/Maxi; United Kingdom; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Farmina N&D N&D Pumpkin Dog Lamb/Blueberry Medium/Maxi Farmina N&D N&D Pumpkin Dog Lamb/Blueberry Medium/Maxi - Farmina N&D N&D Pumpkin Dog Lamb/Blueberry Medium/Maxi; United Kingdom; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Farmina N&D N&D Spirulina Dog Herring Mini Farmina N&D N&D Spirulina Dog Herring Mini - Farmina N&D N&D Spirulina Dog Herring Mini; United Kingdom; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Forthglade Chicken & Brown Rice Wet Dog Food Forthglade Chicken & Brown Rice Wet Dog Food, editorial ingredient summary 2026-09-24; UK; partial summary Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Forthglade Chicken & Butternut Squash Wet Dog Food Forthglade Chicken & Butternut Squash Wet Dog Food, editorial ingredient summary 2026-09-24; UK; partial summary Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Forthglade Duck & Potato Wet Dog Food Forthglade Duck & Potato Wet Dog Food, editorial ingredient summary 2026-09-24; UK; partial summary Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Forthglade Lamb & Butternut Squash Wet Dog Food Forthglade Lamb & Butternut Squash Wet Dog Food, editorial ingredient summary 2026-09-24; UK; partial summary Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Forthglade Turkey & Sweet Potato Wet Dog Food Forthglade Turkey & Sweet Potato Wet Dog Food, editorial ingredient summary 2026-09-24; UK; partial summary Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Health & Digestion Complete Wet Dog Food Health & Digestion Complete Wet Dog Food - Health & Digestion Complete Wet Dog Food; United Kingdom; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Health & Digestion Dry Dog Food Health & Digestion Dry Dog Food - Health & Digestion Dry Dog Food; United Kingdom; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Hill’s Science Plan Large Breed Puppy Chicken Hill’s Science Plan Large Breed Puppy Chicken, editorial ingredient summary 2026-09-24; UK; partial summary Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Hill’s Science Plan Medium Adult Chicken Hill’s Science Plan Medium Adult Chicken, editorial ingredient summary 2026-09-24; UK; partial summary Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Hill’s Science Plan Medium Mature Adult Lamb & Rice Hill’s Science Plan Medium Mature Adult Lamb & Rice, editorial ingredient summary 2026-09-24; UK; partial summary Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Hill’s Science Plan Medium Puppy Chicken Hill’s Science Plan Medium Puppy Chicken, editorial ingredient summary 2026-09-24; UK; partial summary Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Joint Care Dry Dog Food Joint Care Dry Dog Food - Joint Care Dry Dog Food; United Kingdom; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Large Breed Adult Dog Food Rich in Chicken & Rice Large Breed Adult Dog Food Rich in Chicken & Rice - Large Breed Adult Dog Food Rich in Chicken & Rice; United Kingdom; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Large Breed Adult Dog Food Rich in Lamb & Rice Large Breed Adult Dog Food Rich in Lamb & Rice - Large Breed Adult Dog Food Rich in Lamb & Rice; United Kingdom; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • McAdams Awards Bedtime Free Range Turkey McAdams Awards Bedtime Free Range Turkey - Awards Bedtime Free Range Turkey (UK); UK; partial summary Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • McAdams Awards Best Behaviour Free Range Turkey McAdams Awards Best Behaviour Free Range Turkey - Awards Best Behaviour Free Range Turkey (UK); UK; partial summary Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • McAdams Awards Free Range Roast Turkey McAdams Awards Free Range Roast Turkey - Awards Free Range Roast Turkey (UK); UK; partial summary Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • McAdams Awards Fresh Breath Free Range Turkey McAdams Awards Fresh Breath Free Range Turkey - Awards Fresh Breath Free Range Turkey (UK); UK; partial summary Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • McAdams Cats & Kittens Free Range Chicken & Turkey McAdams Cats & Kittens Free Range Chicken & Turkey - Cats & Kittens Free Range Chicken & Turkey (UK); UK; partial summary Cat; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • N&D Prime Dog Chicken/Pomegranate Mini 7kg N&D Prime Dog Chicken/Pomegranate Mini 7kg - N&D Prime Chicken & Pomegranate Adult Mini; United Kingdom; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Omni 5-in-1 Multivitamin Powder Omni 5-in-1 Multivitamin Powder - 5-in-1 Multivitamin Powder; UK; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Omni Puppy Dry Food Omni Puppy Dry Food - Puppy Dry Food; UK; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Omni Senior Dry Food Omni Senior Dry Food - Senior Dry Food; UK; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Omni Sensitive Adult Dry Food Omni Sensitive Adult Dry Food - Sensitive Adult Dry Food; UK; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Pero Foods High Meat - Pork & Sweet Potato with Apple Pero Foods High Meat - Pork & Sweet Potato with Apple - Pero Foods High Meat - Pork & Sweet Potato with Apple; United Kingdom; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Pooch & Mutt Health & Digestion Postbiotic Fish Treats Pooch & Mutt Health & Digestion Postbiotic Fish Treats - Health & Digestion Postbiotic Fish Treats; UK; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Pooch & Mutt Primal Wild Boar High Meat Dry Dog Food Pooch & Mutt Primal Wild Boar High Meat Dry Dog Food - Primal Wild Boar High Meat Dry Dog Food; UK; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Puppy Dry Dog Food Rich in Chicken & Rice Puppy Dry Dog Food Rich in Chicken & Rice - Puppy Dry Dog Food Rich in Chicken & Rice; United Kingdom; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Puppy Dry Dog Food Rich in Salmon & Rice Puppy Dry Dog Food Rich in Salmon & Rice - Puppy Dry Dog Food Rich in Salmon & Rice; United Kingdom; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Puppy Dry Dog Food Rich in Turkey & Rice Puppy Dry Dog Food Rich in Turkey & Rice - Puppy Dry Dog Food Rich in Turkey & Rice; United Kingdom; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • Rest Up Recipe for Dogs (400g) Rest Up Recipe for Dogs (400g) - Rest Up Recipe for Dogs (400g); United Kingdom; manufacturer declaration Dog; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • ROYAL CANIN® Ageing 11+ ROYAL CANIN® Ageing 11+ - ROYAL CANIN® Ageing 11+; United Kingdom; manufacturer declaration Cat; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • ROYAL CANIN® Ageing 15+ ROYAL CANIN® Ageing 15+ - ROYAL CANIN® Ageing 15+; United Kingdom; manufacturer declaration Cat; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • ROYAL CANIN® Indoor Appetite Control ROYAL CANIN® Indoor Appetite Control - ROYAL CANIN® Indoor Appetite Control; United Kingdom; manufacturer declaration Cat; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
  • ROYAL CANIN® Indoor Long Hair ROYAL CANIN® Indoor Long Hair - ROYAL CANIN® Indoor Long Hair; United Kingdom; manufacturer declaration Cat; Source data captured; Label verification pending; Evidence applicability requires the stated ingredient and study review scope
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