21/05/2026
IT'S NOT JUST AN OLD HORSE PROBLEM
A lot of responses to the last post assumed the same thing: this is something to think about when a horse gets older.
It isn't.
Age is one risk factor. It's not the definition of the risk.
Horses develop endocrinopathic laminitis — the metabolic kind, driven by insulin dysregulation — at nine, twelve, fifteen. Ponies can be affected from a remarkably young age. Native breeds, good doers, horses that carry weight easily, horses that have always been "easy to keep" — these are not low-risk horses. In some cases they're the highest-risk horses, and they've been that way for years before anyone noticed.
Pituitary Pars Intermedia Dysfunction, PPID, does skew older. It's most commonly diagnosed in horses over fifteen, and age is a genuine factor there. But insulin dysregulation, the metabolic component most directly associated with endocrinopathic laminitis, doesn't wait for a horse to go grey.
The two conditions are related but distinct.
A horse can have significant insulin dysregulation without PPID, and without looking like the textbook laminitis candidate.
That's the problem. There isn't always a textbook candidate standing in the field.
Some insulin dysregulated horses are obese. Some aren't.
Research has identified a lean phenotype — horses with abnormal fat distribution and dysfunctional insulin responses who don't look obviously overweight. A horse in moderate condition with a slightly cresty neck and a tendency to hold weight through spring can be as metabolically vulnerable as, or more vulnerable than, a visibly round horse that somehow manages grass without consequence.
Body condition scoring matters, but it's one data point, not the whole picture.
So what does prevention actually look like?
It starts with treating the horse in front of you as an individual, not a category. A horse that's always been fine is not necessarily a horse that will always be fine. The question isn't whether he's had problems before. It's whether anything about his physiology, his condition, or his management has quietly shifted.
Monitor body condition through the year, not just in spring.
The horse who is noticeably rounder every April than he was in November, and takes longer each year to lean back up — that's worth paying attention to. So is a neck crest that's becoming a permanent feature rather than a seasonal one. Fat pads behind the shoulders that don't shift. A horse who was once a good doer and is becoming an exceptional one.
These aren't emergencies. They're early indicators. And they're most useful when noticed before the feet are already involved.
Metabolic testing is underused and undervalued in horses without a laminitis history. A resting insulin measurement, ideally followed by a dynamic test if indicated, gives actual data on what the horse's metabolic profile is doing — not an estimate based on how he looks.
It's worth discussing with a vet, particularly for horses in higher-risk categories: native breeds, ponies, good doers, and horses whose condition or metabolic profile has gradually changed over recent years.
For horses already identified as at risk, management is a toolkit, not a single answer.
The horses in the picture live out year-round, with shelter and a natural winter coat, rugged only when conditions genuinely require it. That's not a welfare compromise. It's a management decision with metabolic logic behind it.
Cold exposure increases caloric demand. A horse maintaining body temperature through a proper winter coat burns energy that would otherwise be stored. Combined with more movement and foraging over larger areas, winter can improve insulin sensitivity in appropriately managed horses — those not heavily rugged, not receiving ad lib hay indoors, and actually moving.
Grass growth slows through winter and overall intake often reduces, though sugar content can still spike under cold, bright conditions or following frost. The benefit is real, but it depends on the management system around it.
A horse who comes out of winter slightly leaner than he went in has usually spent several months in a more metabolically favourable state. Spring, with its rapid grass growth and potentially high non-structural carbohydrate availability, lands on a system that's better placed to handle it.
The pressure against this is largely social.
A lean-looking horse in February reads as poor care to people who haven't thought about why it might be the opposite. But there's a meaningful difference between a horse who is lean because he's cold, moving, and metabolically active, and a horse who is underweight because he's unwell.
Learning to distinguish between them — and being comfortable with a winter topline that doesn't resemble a summer show horse — is part of managing a metabolically vulnerable horse well.
Grass remains the central variable for most UK horses through the rest of the year, and managing access is where much of the practical work happens.
Studies suggest a grazing muzzle can reduce intake somewhere between 30 and 80%, depending on pasture conditions and the individual horse. Reduced non-structural carbohydrate intake means reduced post-prandial insulin stimulation. It's not a magic fix, but for a horse that still needs turnout and social contact, it's a meaningful intervention.
Strip grazing and track systems can help limit intake and encourage movement. Avoiding turnout during higher-risk periods matters too — sunny days following cold nights, fast spring growth, stressed or frosted pasture.
And a sparse-looking field isn't necessarily a safe one. Grass sugar content doesn't correlate neatly with how green it looks.
Diet management beyond grass matters too.
Low-sugar, low-starch forage. Hay analysis where possible. Removing unnecessary hard feed. Ensuring adequate mineral balance without unnecessary caloric loading.
Exercise, where soundness allows it, supports insulin sensitivity. Muscle tissue responds to insulin more efficiently than fat tissue does, and a horse in better muscular condition handles carbohydrate load differently than one who has quietly lost topline over several years.
And for horses where PPID is identified — or suspected — veterinary management with pergolide, a dopamine agonist that addresses pituitary dysfunction directly, can improve insulin regulation in some horses and reduce laminitis risk.
It doesn't reliably normalise insulin in every case, and some horses remain dysregulated despite treatment. This is a conversation for a vet, ideally before the first laminitis episode rather than after.
The difficult truth in all of this is that prevention requires acting on things that don't yet look like a problem.
A horse who is slightly too round, very slowly getting crestier, maybe a little more reluctant on hard ground in spring than he used to be — these don't read as emergencies. They read as normal. Especially when the horse has looked more or less like that for years.
But that's exactly the window where intervention changes outcomes.
By the time laminitis is visible, the metabolic system has often been under pressure for a long time.
Prevention is about understanding that, and not waiting for the feet to make it undeniable.
