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Lauren - My 29 year old IR/Cushings mare is on both Pergolide (6 mg) and Chastetree berry (4 tsp). I feel the CTB has helped her "woolyness" problem for the past two years. I have had to go up on Pergolide to control her Cushings. Her hair is long, don't get me wrong, but it is not thick. I blanket her accordingly in the winter since older horses have trouble controlling body temperature and I have never seen her sweat (in winter). I did not clip her this Summer as I usually do but she has a stall with a fan that she likes to lounge in.
Hope this helps - experiment - see what works and what doesn't. That is what I did.
Jean and Amber
in South Carolina