Ingredient evidence profile
Cellulose
Cellulose is a fibre ingredient. Whether it is useful depends on the purpose of the ration, its amount and the outcomes actually tested.
What is it?
Calling cellulose a filler does not explain what it does in a formulation. The useful questions are how much is included, what the complete diet supplies and which outcome the manufacturer is trying to achieve.
Source and function
Plant-derived structural fibre; the ingredient specification describes its source and processing. A fibre component used to influence the properties of a complete ration.
What does the research show?
In a 12-dog crossover comparison, a diet with 10% cellulose produced firmer stools than a beet-pulp diet. A separate fibre-and-biotics experiment also used a cellulose-containing control, but several ingredients changed together.
What the evidence cannot tell us
Neither finding isolates every possible effect of cellulose across commercial foods. The 2019 trial compared equal ingredient percentages, not equal total dietary fibre, and lasted only 14 days per period. It was not a weight-management trial.
Questions to ask about a product
Ask for total dietary fibre, energy density and the purpose of the formulation. A lower digestibility value is not automatically a defect, and a firmer stool is not automatically a better clinical outcome.
Safety and practical limits
This profile does not recommend adding cellulose to a pet’s food. Evidence from a formulated experimental diet cannot specify an appropriate home addition or predict tolerance in a dog with digestive disease.
Sources and related reading
Beet pulp, cellulose and Miscanthus in dog food: a fibre comparison
Primary study source: Donadelli RA, Aldrich CG. The effects on nutrient utilization and stool quality of Beagle dogs fed diets with beet pulp, cellulose, and Miscanthus grass. Journal of Animal Science. 2019;97:4134–4139.
Source checked 24 September 2026. Next review 24 December 2026. This is an initial summary built around the cited research, not a systematic review of all available studies.