I have been training my horse dressage for the past 5 years and jumping for 7, but over the past 3 years or so, he's been getting more spooky and agressive. The vet seems to think that when he was castrated there was some tissue left behind that still produces testosterone. We are trying him on Regumate to see if that helps, but so far...no! Oh, and the vet said he was in great health otherwise, eyes are fine, etc. I am looking at calming supplements and I don't know what to think. I've never used them in my 10 years of riding and not sure what other peoples experiences are. My mom and I have been riding him for years and when he spooks he bolts. We are fine with him bucking, but it's the bolting that scares us most. We don't fall off usually, but it's not fun!