Pituitary pars intermedia dysfunction--PPID, or Cushing's disease--is the most common disease of horses and ponies 15 years of age or older. Although it's not fully understood yet, researchers are learning more about how to treat and prevent it.

In a presentation at the 2006 AAEP Convention, Dianne McFarlane, DVM, PhD, Dipl. ACVIM, assistant professor of physiological sciences at Oklahom

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