As the seasons change, so do horses’ coats to help them stay warm in winter and cool in summer. But occasionally, horses can be late to shed their thick winter coats.While this isn’t always a problem, it can be a symptom of pituitary pars intermedia dysfunction (PPID), also known as equine Cushing’s disease.Drs. Yatta Boakari and Sophia Marchio — veterinarians and equine h...