I feel that horse that bite out of no where do it because, either they are in pain, their bored, or they want attention. I hand feed all the horse I ride, and none of them are bitters. So I don't see hand feeding leading to biting.
I would suggest rule out back pain issues..or any other health related factors. Make sure he is getting enough turn out and exercise. And if all of that is OK, then if he tries to bite, smack him on the shoulder one time. Tell him No, then go about your business. And usually biting them back doesn't work, it just gets dirt and hair in your mouth.
I know a horse that is nippy, and he bites for attention, if you ignore him he eventually stops trying to nip.
But I really found that exercise helps them to stop biting.
Last edited by ErikaLynn; 08-02-2011 at 09:55 AM.