Equine America Shaker Gard Horse SupplementThe Equine America Shaker Gard Horse Supplement is for seasonal nerve, respiratory and immune system support. Head shaking can be distressing for both horse and rider, and may have a number of different causes. Current research suggests that head shaking may be due to hypersensitivity of the trigeminal nerve, which supplies sensation to the face, nose and muzzle. In head shakers it seems that stimuli such as sunlight or pollen which dont affect most