Winter head shaking, advice needed

[thatsmygirl]

My mates mare who she has owned for 3 yrs has just started head shaking. She's never done it before. Any advice is welcome

 

[jackscrag]

First thing id say would be teeth, when did she last have them checked ?, and what age is she ?

 

[digitalangel]

Saddle check - try another saddler . Also teeth and back. check for bridle fit and sensitivity to touch around ears. could be:

badly fitting tack
ear infection/mite
bitting issue
teeth/mouth issue
trigeminal nerve
temporal Mandible Joint (TMJ)
Aural Plaque
rider issue

Observe horse lunged in tack and without tack. observe another rider. observe behaviour at rest in daylight and in the dark.