Laminitis Prevention in Horses: Welfare Guide

Laminitis and Equine Welfare

Laminitis — inflammation of the sensitive laminae connecting the pedal bone to the hoof wall — is one of the most painful and welfare-significant conditions in horses and ponies. Prevention is far more effective than treatment, and understanding risk factors is essential for every horse owner.

Welfare Significance

Laminitis causes severe, acute pain during episodes and chronic pain from the ongoing structural damage it causes. In severe cases, pedal bone rotation or sinking creates irreversible damage requiring euthanasia. Even subclinical or 'mild' laminitis represents significant ongoing welfare compromise.

Types and Triggers

• Pasture-associated (endocrinopathic) laminitis: By far the most common form; triggered by high non-structural carbohydrate (NSC) intake in horses with Equine Metabolic Syndrome (EMS) or Pituitary Pars Intermedia Dysfunction (PPID/Cushing's).
• Inflammatory/systemic laminitis: Secondary to colitis, retained placenta, severe colic, or grain overload — triggers systemic inflammatory cascade.
• Weight-bearing (supporting limb) laminitis: In horses that are off-loading a painful limb for extended periods.

Prevention Strategies

• Grazing management: Restricting pasture access for high-risk horses, especially in spring and autumn; use of grazing muzzles; strip grazing.
• Body weight management: Maintaining healthy body condition score (2.5-3/5); avoiding obesity is the single most important preventive measure for EMS horses.
• Low NSC diet: Late-cut hay tested for NSC content (target <10% NSC); avoiding lush grass and cereal-based feeds.
• Exercise: Regular, appropriate exercise improves insulin sensitivity and supports weight management.
• PPID screening: Testing horses over 15 years for PPID; appropriate medical management with pergolide if confirmed.
• Insulin testing: Dynamic insulin testing identifies EMS horses at highest risk before a laminitis episode occurs.

At-Risk Signs Requiring Immediate Veterinary Attention

• Increased digital pulse in the feet
• Reluctance to walk or turn on hard surfaces
• Standing with front feet extended (laminitic stance)
• Foot pain detectable with hoof testers
• Rings in the hoof wall parallel to the coronary band

Key Takeaways

Laminitis prevention requires proactive management of body weight, grazing, diet, and endocrine health. Identifying and managing high-risk horses before an episode occurs is the most effective welfare strategy, with immediate veterinary involvement at the first signs of laminitic pain.