Horse PPID and EMS Welfare Management

Pituitary pars intermedia dysfunction (PPID) and equine metabolic syndrome (EMS) are common endocrine conditions in horses causing significant welfare impacts.

Key Facts

PPID (formerly called Cushings disease) affects up to 30% of horses and ponies over 15 years of age
It is caused by progressive dysfunction of dopaminergic neurons controlling the pituitary pars intermedia
Clinical signs include abnormal coat shedding (hypertrichosis), muscle wasting, laminitis, and immune suppression
Pergolide (Prascend) is an effective dopamine agonist treatment that significantly improves quality of life
Equine metabolic syndrome is characterized by obesity, regional fat deposits, and predisposition to pasture-associated laminitis
Both conditions predispose to laminitis, a severely painful inflammatory condition of the hoof laminae
Seasonal variation in ACTH levels means testing should be done outside the physiological autumn rise period for accuracy

Welfare Considerations

PPID and EMS create chronic welfare problems in horses that progressively worsen without detection and treatment. The hypertrichosis (abnormal long coat) of PPID horses causes severe heat stress and skin infections, while immune suppression leads to increased parasite burden and infection susceptibility. Laminitis, the most feared complication of both conditions, causes extreme pain described as similar to having fingernails ripped off simultaneously from all four feet, with horses shifting weight, refusing to walk, and showing characteristic sawhorse posture. The pain management of laminitic horses requires intensive veterinary and farriery intervention. Early detection of PPID through annual blood testing from age 15 allows treatment initiation before laminitis occurs, representing one of the highest-value preventive welfare interventions available to horse owners. EMS management through dietary restriction and controlled exercise prevents the obesity that triggers laminitis episodes.

What You Can Do

Test horses and ponies over 15 years annually for PPID using ACTH testing outside the autumn rise period
Implement strict dietary management including grazing muzzles and limited pasture access for EMS-prone individuals
Recognize early laminitis signs including heat in the feet, reluctance to turn, and digital pulse changes
Work with your vet and farrier as an integrated team for managing horses with confirmed PPID or EMS diagnoses