Don't react when he spooks. I have a gelding like this. He was never abused in his life(we raised him) and he had severe fear issues. While is is perfect now, if you move too quick of even reach you hand up to quickly to scratch your nose, he will throw his head up like he has been hit repeatedly in his past, which of course he hasn't. He gets so worked up and worried. "AHH!! It'sgonnaeatme!!!" With work and us not reacting to his spooks, he will spook, and go back to being fine. We don't do anything. We don't yell at him, or discipline him, or run up and cuddle him and tell him it'll be okay. We just let him spook, and when he comes back down to earth, we go on with what we were doing. His spooks have gotten fewer and fewer until they are hardly noticeable. He will always be incredibly alert, but he is great now.
Routine helps a great deal. Do one thing until he is perfect and then add a little more.
If we had gotten after him for spooking it would have given him a reason to be afraid.
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