There’s a lot going on inside your dog’s gut.

Alongside digesting food and absorbing nutrients, their digestive tract is home to a complex community of microorganisms known as the gut microbiome. It interacts with diet, digestion and the gut environment, and research into its wider role in canine health is still developing.

The good news? Supporting healthy digestion doesn’t need to feel complicated. A few sensible habits can make a strong foundation.

First, what is the gut microbiome?

Think of it as a tiny ecosystem living inside your dog’s digestive tract.

It’s made up of bacteria and other microorganisms that interact with one another, the food your dog eats and the digestive system itself.

Some of these microbes help ferment components of food that your dog can’t digest on their own, producing compounds that interact with the gut environment.

Research into the canine microbiome is developing quickly, and scientists are continuing to explore its relationship with nutrition, digestion, immune function and wider health.

There’s a lot we know, and plenty we’re still learning.

What can influence your dog’s gut?

Quite a lot. Diet is an important part of the picture, but it isn’t the only one.

What they eat

Diet can influence the composition and activity of the gut microbiome, which is one reason thoughtful, consistent nutrition matters.

Fibre

Different fibres behave differently in the digestive tract. Some can be fermented by gut bacteria, while others help support normal stool formation and movement through the gut.

Changes in diet

A sudden change in food can cause digestive upset. Introducing something new gradually gives your dog’s digestive system time to adjust.

Stress

Travel, kennels, fireworks and changes in routine can all coincide with digestive upset in some dogs. Sometimes a sensitive tummy isn’t only about what’s in the bowl.

Medication

Some medicines, including antibiotics, can affect populations of bacteria within the gut. If your dog develops digestive changes during or after medication, speak to your vet rather than trying to manage it yourself.

Prebiotics, probiotics and postbiotics: what’s the difference?

You’ll increasingly see these three words across dog food and supplements, but they don’t mean the same thing.

Prebiotics

Prebiotics are substrates that are selectively used by microorganisms and provide a health benefit. Certain types of fibre can act as prebiotics by providing fuel for particular microbes.

Probiotics

Probiotics are live microorganisms that, when administered in adequate amounts, provide a health benefit. The specific strain matters, so evidence for one probiotic shouldn’t automatically be applied to another.

Postbiotics

Postbiotics are preparations of inanimate microorganisms and/or their components that can provide a health benefit. Unlike probiotics, they don’t rely on live microorganisms.

They may sound similar, but they work differently. The specific ingredient, amount, formulation and evidence behind it all matter.

What does healthy digestion look like?

Your dog’s poo is actually one of the most useful things to keep an eye on.

Generally, you’re looking for stools that are well formed, consistent and easy to pick up. Rather than obsessing over the perfect poo, get to know what’s normal for your dog.

Changes worth noticing include:

• Persistent loose stools or diarrhoea
• Blood or persistent mucus in their poo
• Repeated constipation or straining
• Unusually frequent bowel movements
• Persistent wind or tummy discomfort
• Changes in appetite
• Unexplained weight loss

One unusual poo doesn’t necessarily tell you much. A persistent change or pattern is more useful to pay attention to.

Simple ways to support their gut

Start with good nutrition

A complete, balanced diet provides the nutrients your dog needs in the right proportions. Choose food that’s appropriate for their age, size and individual needs, and feed the right amount for them.

Give fibre some thought

Fibre isn’t simply filler. Different types can play different roles, from supporting stool quality to providing substrates that certain gut microbes can ferment. It’s about the right ingredients in the right formulation, rather than simply adding more.

Make changes gradually

If you’re introducing a new food, give their digestive system time to adjust. A gradual transition over around a week is commonly recommended, although some dogs may benefit from a slower change.

Remember the extras

Treats, chews and table scraps all form part of what your dog eats. If their digestion changes, look at the whole picture rather than their main meal alone.

Know their normal

Poo isn’t glamorous, but it’s useful. Knowing your dog’s usual stools, appetite, weight and behaviour makes it much easier to notice when something changes.

And what are we still learning?

A lot, and that’s what makes this area so interesting.

Our understanding of the canine microbiome is continuing to develop. Researchers are still investigating how different microbial communities behave, how diet influences them and what that could mean for canine health.

That’s why we’re cautious of anything promising to simply “fix the gut” or create a perfect microbiome. We’d rather follow the evidence, understand why an ingredient is there and use it with purpose.

When should you speak to your vet?

Digestive changes aren’t always about food or the microbiome.

Speak to your vet if your dog has persistent diarrhoea, repeated vomiting, blood in their stool, unexplained weight loss, loss of appetite, abdominal pain or swelling, or seems generally unwell.

If diarrhoea continues for more than 24 hours, or your dog is very young, elderly, unwell or has other concerning symptoms, seek veterinary advice sooner.

The Ancient Fields takeaway

Your dog’s gut is an extraordinary little ecosystem, and we’re learning more about it all the time.

Supporting it doesn’t need to feel complicated. Good nutrition, thoughtful ingredients, gradual changes and knowing what’s normal for your dog are a very good place to start.