If you're wondering how to calm an anxious horse, the answer often starts further inside than you'd think: in the gut. Your horse's gut and brain are in constant conversation, and the trillions of bacteria living in the hindgut play a part in how your horse feels. A forage-first diet, plenty of friends and turnout, and a settled routine can all help support a calmer horse from the inside out.
We all know the feeling. Your horse is a saint one week, then spooks at the same wheelbarrow he's walked past a hundred times. Or maybe he's always been the nervous type, and you're tired of every ride feeling like a gamble. If your horse is prone to anxiety or easily unsettled, you may be wondering what you can do to help them feel calmer and more confident.
The link between gut health and behaviour is one of the most exciting areas of equine science, and it's one we get asked about a lot. So let's dig in.
Key takeaways
- The gut-brain axis is a two-way connection between your horse's gut and brain.
- Research links high-starch diets to changes in gut bacteria and more reactive behaviour.
- A sudden change in behaviour always deserves a vet check first.
- Forage, friends and freedom are the foundations of a calmer horse.
- Breathing discomfort can sometimes look like spookiness.
What is the gut-brain axis in horses?
The gut-brain axis is the two-way communication line between your horse's digestive system and their brain. Signals travel along nerves, hormones and the immune system, in both directions. The bacteria in your horse's gut (known as the microbiome) are part of that conversation, producing substances that influence how the brain responds to the world.
Think of it like a busy phone line. The brain tells the gut when to speed up or slow down digestion. But the gut talks back too, and what it says depends partly on which bacteria are living there and what they're being fed.
Your horse's hindgut is home to a huge community of microbes. Their main job is fermenting fibre from grass and hay into energy your horse can use. When that community is balanced and well fed with fibre, everything tends to tick along nicely. When it's thrown off balance, the effects can go beyond digestion.
Can gut health affect a horse's behaviour?
Yes, research suggests horse gut health and behaviour are linked. Studies have found that horses fed high-starch diets show changes in their gut bacteria alongside more reactive behaviour. It doesn't mean every anxious horse has a gut problem, but it does mean the gut is worth thinking about when you're looking at nerves.
One study at the University of Glasgow compared ponies on high-starch and high-fibre diets. The ponies on high starch were more reactive, and their gut bacteria shifted too, with fewer of the fibre-loving bacteria and more of the types that thrive on starch. The researchers even found changes in brain chemistry linked to reward and motivation (Bulmer, University of Glasgow, 2020).
World Horse Welfare also notes that low-forage, high-sugar and high-starch diets are associated with unwanted behaviours (World Horse Welfare). So if your horse is on a sugary, cereal-heavy feed, that's a good place to start asking questions.
What's fascinating is that a gut out of balance may show up as spookiness or stress before it ever shows up as a tummy issue. That's why it's worth looking at the gut early, not just when digestion seems off. Equine microbiome testing, which looks at the bacteria in a sample of your horse's droppings, is one way scientists (and curious owners) are starting to see what's going on in there.
Why is my horse suddenly spooky?
A horse can become suddenly spooky for lots of reasons: pain, a change in routine, new companions, less turnout, a change of feed, or simply the season. Autumn brings shorter days, more time stabled, windy weather and fireworks, all of which can unsettle a sensitive horse. If the change is sudden or out of character, always ask your vet to check for pain first.
It's easy to label a horse "naughty" when really they're telling us something. Before you think about nutrition, run through the basics:
- Pain or discomfort. Teeth, back, saddle fit and feet can all turn a calm horse jumpy. Your vet, dentist, physio and saddle fitter are your first calls.
- Changes in routine. A new yard, a new field mate, a friend leaving, or a change in turnout times can all knock confidence.
- Feed changes. Switching to autumn feeds or forage too quickly can unsettle the gut. Our guide to changing your horse's feed for autumn and winter walks you through a slow, settled switch.
- The season itself. Wind, rain, rustling leaves and bangs from fireworks are all very real triggers for a spooky horse.
Keeping a simple diary helps. Note when spooks happen, what the weather was like, what your horse had eaten and how long they'd been in. Patterns often jump out after a couple of weeks.
How can I help my anxious horse naturally?
The most effective natural ways to help an anxious horse are the basics horses evolved with: plenty of forage, time with friends, and freedom to move. A fibre-rich diet with less sugar and starch supports a balanced gut, while turnout and company help your horse feel safe. Natural calming herbs can play a supporting role, but they work best on top of good management, not instead of it.
Start with the 3Fs
World Horse Welfare sums it up brilliantly as friends, forage and freedom (World Horse Welfare):
- Friends. Horses are herd animals and feel safest with company. Even seeing other horses from the stable can help.
- Forage. Your horse is designed to spend most of the day eating. Keeping hay or grass available keeps the gut, and the mind, busy.
- Freedom. Movement matters. Turnout, walking out in hand and varied work all help an anxious horse let off steam.
Feed the gut, not just the horse
Many owners have asked us about "non-heating feed". The truth is, no feed works the same way for every horse, but a few principles help most anxious horses:
- Put forage first. Build the diet around grass, hay or haylage, and top up from there.
- Go easy on sugar and starch. If your horse needs more energy, look at fibre and oil-based options rather than cereal-heavy mixes.
- Feed little and often. Smaller, more frequent meals are kinder to the gut than one big bucket.
- Change things slowly. Any change in feed or forage should happen gradually, over a couple of weeks.
Keep the routine predictable
Horses love to know what's coming next. An anxious horse often settles best when feeding, turnout and exercise happen at roughly the same times and in the same way. Surprises are stressful for a prey animal, so where you can, make changes one at a time and give your horse a few days to adjust before the next one.
Your own mood matters too. Horses are experts at reading us, and a tense rider often means a tense horse. Slow breathing, soft hands and a calm voice can make more difference than you'd expect when your spooky horse is on high alert.
What can natural herbs do (and not do)?
Herbs such as chamomile, lemon balm and vervain have been used for horses for generations, and many owners find them a helpful part of a calming routine. A natural horse calmer can support a horse through a stressful period, like fireworks season or a move to a new yard.
What herbs can't do is fix a horse in pain, replace training, or make up for a stressful routine. If your horse is anxious because something hurts, or because they're stabled alone for 20 hours a day, no calmer will solve that. Think of natural support as one piece of the jigsaw, alongside good management, appropriate training and a vet check if anything seems off.
If you compete, always check any supplement against your governing body's rules before you use it.
Can breathing discomfort look like spooking?
Yes, breathing discomfort can sometimes look like spookiness or resistance. A horse who finds it harder to breathe may be tense, evade contact, or reluctant to go forward, especially in dusty environments or during harder work. If your horse coughs, has a runny nose or seems to tire quickly, speak to your vet.
This one surprises a lot of owners. Autumn and winter mean more time in the stable, which means more dust from hay and bedding. For some horses, that's enough to make them uncomfortable, and an uncomfortable horse is rarely a relaxed one. We go into dust, bedding and hay soaking in our guide to stable dust, coughing and getting ready for more time indoors.
Your calmer-horse checklist
- Rule out pain with your vet, dentist, physio and saddle fitter.
- Keep a spook diary for two weeks: weather, feed, turnout, triggers.
- Build the diet around forage and cut back on sugary, starchy feeds.
- Make any feed changes slowly, over at least two weeks.
- Maximise turnout and time with other horses.
- Reduce dust in the stable, especially as you bring your horse in more.
- Plan ahead for known triggers like Bonfire Night.
- Consider natural support as part of the bigger picture, not a quick fix.
FAQ
How long does it take to see a calmer horse after a diet change?
Gut bacteria adjust over weeks rather than days, so give any diet change time. Many owners notice a difference within a few weeks of moving to a more forage-based diet, but every horse is different. If you see no change, or things get worse, speak to your vet or a nutritionist.
Is my horse spooky or just fresh?
A fresh horse is usually full of energy and settles once they've let off steam. A genuinely anxious horse stays tense, watchful and reactive even when tired. If spooking is new, frequent or getting worse, ask your vet to check for pain first.
Does an anxious horse need less energy in their feed?
Often, yes, but it's more about the type of energy than the amount. Energy from fibre and oil is released slowly, while energy from sugar and starch arrives quickly. Many owners find an anxious horse copes better on a forage-based diet with slow-release energy. A nutritionist can help you get the balance right for your horse's workload.
Can I prepare my horse for fireworks?
Yes. Find out local display dates, keep your horse in familiar surroundings with their friends, and keep the routine as normal as possible. Plenty of forage helps keep them occupied. If you're worried, talk to your vet well in advance.
Your horse's behaviour is a message, and the gut is often part of what they're telling you. Look after their gut, their friendships and their freedom, and you're giving them the best chance to feel calm from the inside out.
If you'd like to explore further, take a look at our range of natural horse calming supplements and natural gut supplements.
References
- Bulmer, L. S. (2020). High-starch diets increase behavioural reactivity, alter hindgut microbiota and brain neurochemistry in horses. PhD thesis, University of Glasgow.
- World Horse Welfare. The 3Fs: friends, forage and freedom.
About the author
Alexandra Frazer, Founder of Equinutritive, BSc Equine Science. Alexandra is the equine scientist behind Equinutritive's natural, science-backed nutrition for horses.