I have been treating an aging pony mare for Cushing’s syndrome. She had been chronically foundering for three years when she abruptly started exhibiting diabetic symptoms. After reading your article on Cushing’s and conferring with my veterinarian, we put her on pergolide. Her diabetic symptoms disappeared, and she is now back to normal.

My other mare, a 19- or 20-year-old Thoroughbred, now is getting the wavy hair coat associated with Cushing’s. My first horse, a gelding, lived to the ripe old age of 34 in the same environment. He did have the fatty tumors often associated with older horses, but not Cushing’s.

My question is–could something in the environment be predisposing them to the syndrome?