Horse Cushings Disease and Quality of Life

Equine Cushings disease (PPID) is the most common endocrine disorder in horses and requires lifelong management to prevent severe welfare impacts.

Key Facts

Pituitary pars intermedia dysfunction (PPID) affects approximately 21-30% of horses over age 15
It results from oxidative damage to dopaminergic neurons causing loss of inhibitory control over the pituitary
The long curly coat (hypertrichosis) that fails to shed is the most visible and recognizable clinical sign
Secondary laminitis is the most serious complication, occurring in 30-70% of PPID horses
Autumn ACTH levels rise physiologically in all horses, complicating diagnosis; testing in summer reduces false positives
Pergolide mesylate (Prascend) is the only licensed treatment and significantly reduces ACTH levels and clinical signs
With appropriate management, horses with PPID can maintain acceptable quality of life for many years

Welfare Considerations

PPID creates a cascade of welfare problems that compound over time without treatment. The heavy, non-shedding coat causes heat stress in warm weather and skin fold infections, while immune suppression from elevated cortisol leads to increased parasite burdens and chronic infections. Muscle atrophy from cortisol-driven protein catabolism leaves horses with a characteristic pot-bellied appearance and loss of topline. Polydipsia and polyuria from diabetes insipidus require constant water access and create management challenges. The welfare impact of laminitis in PPID horses can be extreme, with severe cases requiring euthanasia due to uncontrollable pain. Effective welfare management requires early detection through regular ACTH monitoring, prompt treatment initiation with pergolide, strict dietary management to prevent laminitis, regular foot care, and parasite control appropriate to the immunocompromised status of affected individuals.

What You Can Do

Test all horses over 15 years for PPID annually using summer ACTH measurement to catch the condition before laminitis develops
Work with your vet to find the minimum effective pergolide dose balancing side effect risk against disease control
Implement strict dietary management including grazing restriction for PPID horses to prevent pasture-associated laminitis
Monitor closely for early laminitis signs including increased digital pulse, hoof warmth, and reluctance to walk on hard ground