Chicory Root for Dogs: The Prebiotic Fibre Explained

Written by Lucy Fitzgerald, Founder, WYLDR. Reviewed by Katie McCaul, RNutr, The Pet Diet.

The short answer: Chicory root is a natural source of inulin, a prebiotic fibre. Rather than adding bacteria to the gut, it feeds the beneficial bacteria your dog already has, which ferment it into short-chain fatty acids that support a healthy gut and microbiome. It is one of the most studied prebiotic fibres in pet nutrition, safe at sensible levels, and a recognisable, functional reason it appears in quality dog food.

Chicory root turns up on more and more dog food labels, and unlike some trendy ingredients, it is there for a genuine, well-understood reason. It is one of nature's best-known sources of prebiotic fibre, with real research behind its role in the canine gut. This guide explains what chicory root is, what inulin does, whether it is safe, how much makes sense, and why it earns its place in a dog's bowl.

What is chicory root?

In short: Chicory is a plant, and its root is a natural, concentrated source of inulin, a type of prebiotic fibre. In pet food it is usually included as chicory root fibre or powder.

Chicory is a hardy plant with bright blue flowers, and it is the root that matters nutritionally. That root is one of the richest natural sources of inulin, a soluble, fermentable fibre that behaves as a prebiotic. In dog food, you will usually see it listed as chicory root, chicory root fibre or a source of inulin, and it is included specifically for that prebiotic fibre rather than as a filler or flavour.

In other words, chicory root is not an exotic novelty. It is a recognised, functional fibre source with a specific job, which is why it appears so consistently in nutrition-led dog foods.

Is chicory root safe for dogs?

In short: Yes, at the sensible levels used in formulated dog food it is safe and well tolerated. As with any fermentable fibre, very large amounts can cause gas or loose stools.

Chicory root, included at the levels used in properly formulated dog food, is safe and well tolerated by most dogs. It is one of the most widely used and studied prebiotic fibres in pet nutrition, precisely because it does its job reliably without drama when used sensibly.

The only real caveat is the same one that applies to any fermentable fibre: too much at once can cause gas, bloating or loose stools, because you are giving the gut bacteria a lot to work on very quickly. This is why chicory is included at measured levels rather than piled in, and why introducing any new prebiotic gradually is the sensible approach. If your dog has an ongoing digestive condition, check with your vet before adding anything new.

What chicory root does in the gut

In short: Its inulin is fermented by the beneficial gut bacteria, which selectively feeds helpful species and produces short-chain fatty acids. Canine studies show it favourably supports hindgut fermentation and a healthy microbiome.

Here is the mechanism, kept simple. The inulin in chicory root is not digested in the small intestine. Instead it travels to the hindgut, where the beneficial bacteria ferment it. In doing so, it selectively encourages helpful species, and the fermentation produces short-chain fatty acids such as acetate, propionate and butyrate, which the gut itself uses. This is the classic prebiotic action: feeding the good bacteria already present rather than adding new ones.

This is not just theory. Studies feeding chicory root to dogs have found favourable effects on hindgut fermentation, short-chain fatty acid production and markers of gut health. It is one of the better-evidenced prebiotic fibres in canine nutrition, which is a large part of why it is trusted. If you want the fuller picture of how prebiotic fibre fits into gut health, our guide to dog gut health covers it.

Inulin explained

In short: Inulin is the specific prebiotic fibre found in chicory root. Whole chicory root may bring advantages over purified inulin in how it ferments.

Inulin is the fibre that does the work. It is a soluble, fermentable fibre made of chains of fructose units that dogs cannot digest but their gut bacteria can. When people talk about chicory root as a prebiotic, inulin is really what they mean.

Interestingly, research suggests that whole chicory root is not simply a delivery vehicle for purified inulin. Native chicory inulin has been shown to ferment slightly differently from synthetic versions, with a favourable effect on the production of short-chain fatty acids. It is a small but useful reminder that a whole, natural fibre source can behave differently from an isolated ingredient.

Why chicory root is in dog food

In short: It is a natural, well-evidenced way to add prebiotic fibre and support the gut microbiome. That is why nutrition-led brands include it, offered as everyday support rather than a fix for anything.

Put all of that together and it is easy to see why chicory root has become a go-to prebiotic in quality dog food. It is natural, it is one of the most studied prebiotic fibres in pet nutrition, and it does a clear, specific job: feeding the beneficial gut bacteria to help support a healthy gut and microbiome.

This is exactly why chicory root is one of the five ingredients in WYLDR's Every Dog Every Day. It is included as a source of prebiotic fibre to help support a healthy gut and microbiome, alongside omega-3 from salmon oil and antioxidants from blueberry, the everyday things a typical bowl can miss. As always, that is a description of what the ingredient does, framed as everyday support, not a promise to fix anything. Our guide to whether dogs need supplements explains where that thinking comes from.

Frequently asked questions

What is chicory root?
Chicory is a plant whose root is a natural, concentrated source of inulin, a soluble prebiotic fibre. In dog food it is usually listed as chicory root, chicory root fibre or a source of inulin.

Is chicory root good for dogs?
Yes. As a source of prebiotic fibre, chicory root feeds the beneficial gut bacteria and helps support a healthy gut and microbiome. It is one of the most studied prebiotic fibres in pet nutrition and is widely used in quality dog food.

Is chicory root safe for dogs?
At the sensible levels used in formulated dog food, chicory root is safe and well tolerated. As with any fermentable fibre, very large amounts at once can cause gas or loose stools, so it is included at measured levels and best introduced gradually.

What does chicory root do in a dog's gut?
Its inulin is fermented by the beneficial bacteria in the hindgut, which selectively feeds helpful species and produces short-chain fatty acids that the gut uses. This is the classic prebiotic action of feeding the good bacteria already present.

What is inulin?
Inulin is the prebiotic fibre found in chicory root. It is a soluble, fermentable fibre that dogs cannot digest but their gut bacteria can, which is what makes it a prebiotic.

Why is chicory root in dog food?
It is a natural, well-evidenced way to add prebiotic fibre and support the gut microbiome, which is why nutrition-led brands include it as everyday gut support.

Sources

• "Chicory root powder included as a prebiotic in different cereal-based diets for dogs: influences on gut health, metabolic and immunological status" (peer-reviewed, ScienceDirect): link
• "Biofunctional assessment of chicory as a prebiotic in dogs" (peer-reviewed, ScienceDirect): link
• "Molecular assessment of the fecal microbiota in healthy cats and dogs during supplementation with FOS and inulin" (PMC): link
• University of Guelph Pet Nutrition, "Prebiotics for dogs": link
• Puhlmann ML, et al. "Dried chicory root improves bowel function, benefits intestinal microbial trophic chains and increases faecal and circulating short-chain fatty acids", Gut Microbiome (2022, peer-reviewed): link
• Bhosle A, et al. "Response of the gut microbiome and metabolome to dietary fiber in healthy dogs", mSystems (2025, peer-reviewed): link