The grass is green again: what does it mean for your horse?
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Read time 6 min
Table of Contents
KEY TAKEAWAYS
Fresh grass can return quickly after drought and rain
A sudden change in grazing can increase sugar and calorie intake
Grass can affect behaviour and digestion as well as weight and feet
Monitor your horse closely as grazing changes
Grazing management and a suitable balancer can work together to support nutritional needs
Are you worried about the fresh grass shooting through?
For months, horse owners across the country have been praying for rain. Now it's here, and if your horse has ever been sensitive to rich grazing, you might be wondering what the return of fresh green grass could mean for them.
After a long, hot and dry summer, many paddocks have gone from lush grazing to dry, sparse fields. Now, with rain and warmer weather, new growth is appearing – and for some horses, that change can bring a whole host of familiar niggles back with it.
Grass sensitivity in horses isn't just about laminitis. Changes in behaviour, digestion, weight and way of going can all be worth paying attention to.
So, what happens when the grass starts growing again, and what should you be looking out for?
Grass taken 5 days apart
Grass stressed by drought is like a plant holding its breath, alive under the surface, roots intact, just waiting. The moment real rain lands, especially with some warmth behind it, it exhales all at once, and that first flush of growth is loaded with sugar because the plant hasn't yet built the fibre to dilute it.Â
That sugar hit doesn't only threaten hooves. It changes what's fermenting in the hindgut, can unsettle the stomach, and can tip a horse's whole nervous system on edge, often before anything looks physically wrong. That's why grass sensitivity rarely reads like a textbook. It reads like a list of unconnected niggles.
Why does grass change after drought and rain?
Grass responds quickly to changes in weather. After a prolonged dry period, rainfall can trigger new growth, particularly when warmer temperatures and sunshine follow.
That means your horse may suddenly have access to more fresh, actively growing grass than they have been used to.
It's also important not to assume that brown grass is automatically low in sugar. Grass sugar levels are affected by a combination of factors including weather, sunlight, temperature, growth stage and plant stress, so the appearance of the field doesn't tell the whole story.
The important thing is the change in what your horse is eating.
If your horse has been eating sparse, dry grazing for weeks and suddenly has access to a flush of fresh growth, their grass intake and overall diet can change quickly.
Signs your horse may be reacting to grass
Watch for any combination of the following as new growth comes through:
Hoof and foot: tenderness, a shortened stride, reluctance to move or care over hard ground
Behaviour: sudden girthiness, spookiness, overexcitement or a horse that's harder to settle
Digestive: bloating, wind, loose droppings or faecal water
Weight: a noticeable increase in weight or condition
Musculoskeletal: tension through the back, pelvis or hindquarters, stiffness or a change in way of going
One sign alone doesn't necessarily mean grass is the cause. But if you notice the same pattern whenever grazing changes, it's worth paying attention.
Who's most likely to react
- Horses with a laminitis history, EMS or insulin dysregulation, the clearest risk.
- Horses generally affected by grass. The ones who get bloated, girthy or difficult every time the grazing changes, including those who go the other way and become overexcited or full of unspent energy.
- PPID (Cushing's) horses, already less efficient at handling sugar spikes.
- Horses prone to ulcers, where sudden dietary change is often enough to flare symptoms.
- Good doers, who gain weight fastest when grazing sugar rises.
Blue Chip Feed
Blue Chip Feed
Your four-point plan for the grass flush
1. Restrict before you see a problem. Strip grazing, a muzzle, cut turnout hours, or bring the most reactive horses in during the peak flush. Sugar is lowest in the early morning and builds through a sunny day, so turn out before sunrise where you can, and be extra cautious after a cold night followed by bright sunshine, when levels spike highest. Back it up with soaked hay so the diet isn't relying on new growth.
2. Support the gut, not just the waistline. Cutting grass removes nutrients as well as calories. A properly formulated balancer fills that gap and supports the hindgut through the change, which matters as much for the bloated, girthy horse as the one prone to laminitis.
3. If it keeps happening, get it checked. A horse reacting strongly to every grass change is worth a vet conversation about EMS or PPID testing and ruling out ulcers if digestive or behavioural symptoms feature. It changes how you manage them long term.
4. Check the physical side too. Horses that react badly to grass often carry it in the body as well, tension through the back, pelvis or hindquarters, or a stiffer way of going. A check from your vet or a qualified equine therapist is worth adding alongside the feed changes.
Which Blue Chip Super Concentrated balancer fits which horse
Slim & Trim Super Concentrated Feed Balancer carries four times less sugar and starch than many similar balancers, with cinnamon and L-carnitine to support healthy blood sugar and glucose tolerance. Ideal for good doers and horses prone to laminitis while the grass is unpredictable.
Ulsa-Cool Super Concentrated Feed Balancer is for the horse whose gut reacts first. It buffers stomach acid and supports the gut lining, useful when the sudden switch from dry, dormant grazing to lush growth unsettles digestion and triggers bloating, loose droppings or ulcers.
Calming Super Concentrated Feed Balancer is for the horse who shows it through behaviour first: sharp, spooky or hard to switch off once the grass comes through. Chamomile, magnesium and L-tryptophan work alongside full balancer nutrition to take the edge off.
Senior Super Concentrated Feed Balancer suits older horses prone to PPID. It includes chaste tree berry to support normal pituitary function in Cushing's, plus antioxidants, a joint supplement and probiotics, useful backup for a horse already more exposed to sugar spikes.
Not sure which one fits your horse? Our free personalised feed advice service can talk you through it.
Take our short quiz
Find out which of our balancers could be the right fit for your horse or pony. It’s quick, easy, and tailored to help you make the best choice for their health and wellbeing.
Frequently Asked Questions
How quickly does the grass become risky after rain?
Often within days, especially if warm weather follows. Tighten up grazing management as soon as the rain arrives.
My horse had a great summer. Surely that means the sensitivity has gone?
Not necessarily. The drought likely removed the trigger, not the sensitivity itself. Horses that appeared better over a dry summer, losing weight, calmer, moving more freely, often react again once the grass returns.
My horse doesn't have laminitis. Could grass still be causing their symptoms?
Yes. Grass sensitivity can show up as digestive upset, behavioural change or musculoskeletal tension without ever touching the feet. If symptoms track with grazing changes, it's worth investigating.
Should I stop turnout altogether, or is restricting it enough?
It depends how sensitive your horse is. For many, a grazing muzzle, strip grazing or shorter hours is enough, backed up with soaked hay. The most reactive horses may need to come off grass altogether while the flush is at its worst.
Is a feed balancer the first thing I should do?
Yes. A feed balancer keeps a horse's core nutrition, vitamins, minerals and gut support running properly all year round, so the whole system is working well before the flush even hits. Restricting grazing still matters alongside it, but the balancer is the foundation.
When should I call the vet instead of just adjusting feed?
Any foot pain, heat in the hooves, reluctance to move, or a sudden change in behaviour or droppings warrants a call to your vet. These can be early signs of a bigger problem, and acting fast makes a real difference.
Blue Chip Feed
Written by: Laura Cackett
Managing Director at Blue Chip and has over 25 years’ experience in the equestrian industry. Passionate about horse welfare and nutrition. She enjoys sharing her knowledge and expertise to help horse owners make informed feeding decisions.
