If you’ve been involved with horses for even just a few years, chances are you’ve encountered at least one with pituitary pars intermedia dysfunction (PPID). Also known as Cushing’s disease, this endocrine disorder is common in older horses. In fact, studies estimate that 20 percent of horses over the age of 15 will develop PPID. Add in the fact that horses are living longer than ever before and it’s not surprising that most of us have some familiarity with the disorder. The prevalence of PPID has made it a focus of research efforts. Almost 150 scientific papers on the topic have been published in the past decade alone, a body of work that has yielded significant advances in PPID diagnosis and management. While some equine diseases remain stubborn mysteries, more is understood about PPID with each passing year. Researchers and veterinarians have been eager to disseminate this knowledge through one-on-one conversations, internet groups and publications. All of which makes it easier than ever before to learn the basics of PPID and implement a strategy to keep an affected horse healthy for years.