Almost every horse I have had has had to learn about my bubble. If they hit me in the head they are getting a smack to the nose and no none of my horses are head shy. But if my horse was to accidently hit you in the head with her head she will snap her head back and look at me like " I am so sorry!" I do not have any problems with my horses hitting me in the head. They know they will get a spanking for it and that they better be aware of where I am at at all times.