I've noticed the past few days Misty has been shaking her head???? She will do it a few times then go about eating or running and playing with Josie etc. She kind of puts her head down when doing this. It is not often but often enough for it to catch my attention. I looked in her mouth, looked at her ears feeling for bumps, sores whatever, nothing. She is acting fine eating, drinking, pooping, peeing and being her sassy little self! Any ideas of what this might be? Or anyone ever see this in their horses??