Headshaking behavior is thought to be caused by overactivity of branches of the trigeminal nerve that supply sensation to the face and muzzle. A horse's behavioral reflex causes him to flip his head, snort or sneeze, rub his head, or take evasive action.Oct 2, 2014
How do you treat head shaking in horses?
Cyproheptadine (an antihistamine) and carbamazepine (an anticonvulsant) are commonly prescribed, but side effects include lethargy and depression. If your horse is a seasonal headshaker whose symptoms are typically worse in spring and summer, your veterinarian might suggest giving melatonin year-round.May 25, 2018