Laminitis in horses: symptoms and signals

You can often tell laminitis is coming before the horse is visibly lame. That window, between "something feels off" and "this horse cannot walk properly," is where early intervention actually makes a difference. Knowing what to feel for is the whole game.

What is laminitis, and why does it escalate

The name suggests inflammation, and in some cases that is accurate. But the mechanism depends on the trigger. The most common form, in horses on spring pasture or after grain access, is not primarily an inflammatory disease at all.

Laminitis describes a failure of the laminae: the tissue layers that anchor the pedal bone to the inside of the hoof wall. When this connection breaks down, the pedal bone loses its support. In severe or prolonged cases it can rotate downward or, in the worst outcomes, sink through the sole entirely. That structural damage is irreversible. The underlying process is treatable. Which is exactly why catching it early matters so much.

Current research distinguishes three forms. The most common is endocrinopathic laminitis, driven by insulin dysregulation: chronically elevated insulin disrupts cell adhesion within the laminae through metabolic pathways, not through classical inflammation. The second is sepsis-related laminitis, where systemic illness (a retained placenta, a severe bout of colic, systemic infection) triggers inflammatory signalling that damages the lamellar tissue. The third, supporting limb laminitis, develops in a leg taking excess weight because the opposite limb is severely injured. The proposed unifying mechanism across all three is stress at the basal epithelial cells: the cells responsible for holding the lamellar connection intact (Elliott & Bailey, 2023).

The front feet carry more of the horse's weight and are far more commonly affected. Ponies and overweight horses face higher risk of the endocrinopathic form, as do horses with insulin dysregulation. In clinical practice, I see a significant number of cases triggered by something that happened elsewhere in the body: a retained placenta, a bout of colic, or a feed-room door left open overnight.

The early signs: what to look and feel for

The earliest signs are easy to miss because the horse is still moving, still eating, still behaving relatively normally. That is the point at which most owners lose precious time.

Warm hooves

Pick up the hoof and hold the wall in your hand. Compare it to the other feet. Some warmth is normal, especially after exercise. What you are looking for is heat that is significantly greater than the other hooves, or that persists when the horse has been standing quietly. Bilateral warmth in both front feet at rest is a signal worth taking seriously.

A palpable digital pulse

This one takes a little practice, but it is one of the most reliable early indicators available. Place three fingers on the inside or outside of the fetlock, over the digital artery — never your thumb, which has its own pulse and can give you a false reading. In a healthy horse at rest, you can barely feel the pulse. In a horse with early laminitis, the pulse is bounding and obvious. The artery is hammering against your fingers. Once you have felt a normal digital pulse and then felt an abnormal one, you will not confuse the two again. It is that different.

A stiff, rigid gait

The horse walks carefully. Short steps, reluctance to turn on hard ground, a slightly pottery quality to the movement. This is not lameness in the classic sense yet (the horse is still moving), but the stride is noticeably shortened and guarded. On a circle, the discomfort becomes more apparent.

Later-stage signs: this is an emergency

If the early signs go unaddressed, the presentation changes. The horse is now in real pain, and it shows.

The most characteristic posture is the classic laminitic stance: front feet pushed forward, weight shifted back onto the hindquarters, toes lifted slightly to take pressure off the painful toe area. Some horses will also plant their front feet wide apart. They are trying, in every mechanical way they can, to unload the front of the hoof.

Systemically, the pain response kicks in. Fever is possible. The horse may sweat, even in cool conditions. Heart rate climbs. These are signs that the inflammatory process is significant and the animal needs pain relief now, not later in the day.

I want to be direct about something: at this stage, the horse should not be waiting for a scheduled appointment. Call your vet.

What to do while you wait for the vet

Do not force exercise. Movement on inflamed laminae can worsen the structural damage. If the horse is standing quietly, let it stand. Deep, soft bedding provides some pressure relief.

Cool the hooves. Standing in cold water or applying cold hosing to the lower limb is one of the most effective immediate interventions available. It reduces local inflammation and, in the early stages, can help limit damage.

Remove access to pasture and any high-sugar feed immediately. Grass, particularly lush spring grass, contains rapidly fermentable carbohydrates that can make the metabolic picture significantly worse.

Managing laminitis over time

Once the acute phase is under control, the work shifts to long-term management. Weight management is central for horses and ponies with metabolic laminitis. Restricting pasture access, using a grazing muzzle, and adjusting hay rations are all evidence-based approaches. Appropriate, controlled movement (once the acute inflammation has resolved) helps maintain hoof health and circulation.

Farriery is not optional. Regular trimming and, in some cases, corrective shoeing are part of managing the horse through recovery and reducing the risk of rotation progressing. A good farrier who communicates with your vet is worth their weight in gold.