Laminitis in horses: causes, evidence and red flags
Laminitis in horses: causes, evidence for diet and cryotherapy, red flags and when to call a vet immediately.
Short & honest
Strong evidence (grade A): for metabolic laminitis, a low-NSC diet is the most effective intervention; cryotherapy in the acute phase demonstrably limits lamellar damage. Acute cases always require immediate veterinary assistance.
Veterinary review not yet completed
This page is awaiting review by a registered veterinary surgeon. Until then, treat the text as education based on the sources listed — not as a verified veterinary judgement.
What is laminitis?
Laminitis is an inflammation of the lamellar tissue that connects the coffin bone (P3) with the hoof wall. In severe or recurring cases, P3 can rotate or sink — a painful and structurally significant complication. It is one of the most common causes of chronic lameness in horses [2].
Causes and risk profiles
Approximately 90% of cases have an endocrine cause [1]:
- Equine Metabolic Syndrome (EMS): chronic hyperinsulinaemia, often in ponies and miniature horses with overweight
- PPID (Cushing's): increased ACTH production, especially in older horses
- Fructan peak in grass: risk highest in spring and early summer; sensitive animals must not be allowed unrestricted access to pasture during these times
Other causes (overload, shocking dietary change, sepsis) are less frequent but not rare.
What the evidence says
Diet (strong evidence)
In metabolic and endocrine laminitis, a diet low in non-structural carbohydrates (NSC < 10% dry matter) is the most substantiated intervention [2]. Soaking hay for 30–60 minutes in water significantly reduces the sugar content and is practically applicable. Pasture access during risk periods must be avoided or strictly limited.
Cryotherapy (strong evidence)
Cryotherapy — keeping hooves continuously in ice water (<5 °C) during the first 72 hours after the trigger phase — demonstrably reduces the severity of lamellar damage [2]. This is solely an adjunct to veterinary treatment, not a replacement.
Nutraceuticals and supplementation (limited evidence)
A recent RCT shows that certain nutraceutical supplements can help reduce insulin resistance in horses with a history of insulin dysregulation [3]. The research is promising but small-scale; supplementation does not replace dietary correction or medical treatment. Concrete dosing advice belongs with the treating veterinary surgeon.
Stable rest, bedding and therapeutic farriery (consensus)
Deep bedding layers (sand or sawdust) and prolonged stable rest reduce pressure on the lamellar tissue. Therapeutic farriery can reshape the load on P3; in cases of progressive rotation, a DDFT tenotomy (severing of the deep digital flexor tendon) is sometimes considered [2]. These are veterinary decisions.
Diagnostics
A proper workup includes [1][2]:
| Examination | Purpose |
|---|---|
| Insulin and glucose test | EMS screening |
| ACTH measurement | PPID screening (Cushing's) |
| Hoof radiographs | Quantify degree of P3 rotation |
Adjunctive ≠ replacement
Dietary management, cryotherapy and pasture restriction are valuable support, but not a replacement for veterinary diagnostics and treatment. In a first episode or worsening, immediate consultation is mandatory; P3 rotation can cause irreversible damage within hours.
Why this verdict?
The evidence base for laminitis is strong (grade A): large cohort data show that >90% of cases are endocrine in origin [1], clinical guidelines are based on controlled research into diet and cryotherapy [2], and recent RCT data support targeted nutritional supplementation for insulin dysregulation [3]. Limitations lie mainly in the small study populations in supplementation research.
Interactions with medication
- Corticosteroids (e.g. for other conditions): increase insulin resistance and can trigger or worsen laminitis — always report to the vet
- NSAIDs (e.g. phenylbutazone): widely used for pain control, but mask clinical deterioration — use only under veterinary supervision
Legal status (Netherlands)
Treatment of PPID with pergolide requires a veterinary prescription; over-the-counter supplements do not fall under this regime but do not replace prescribed therapy.
Sources
- [1] Phenotypic, hormonal, and clinical characteristics of equine endocrinopathic laminitis. Journal of Veterinary Internal Medicine, 2019. Cohort study doi:10.1111/jvim.15419
- [2] Laminitis in Horses — Merck Veterinary Manual. Merck Veterinary Manual. Guideline source ↗
- [3] Nutraceutical Supplement Mitigates Insulin Resistance in Horses with a History of Insulin Dysregulation During a High-Starch Diet Challenge. PMC / Animals (Basel), 2024. RCT source ↗