It is a seasonal thing and although it is not too obvious it is distressing and very infuriating. She flips her nose vertiacally up and down, and rubs it after excersise. It is worse when she is excited or stressed. Thank you very much. Dear Eleanor, Thanks for your question about headshaking.
Some horses become so afflicted that they are positively dangerous and become unrideable.
It seems that no one really knows what causes headshaking still despite all the wonders of modern veterinary science , hence there is no proven complete cure for every case . There are some drugs which can help in certain cases and your vet will be able to help you there. It is an operation which involves cutting a section out of the two infraorbital nerves on each side of the horse's face. Although it is a simple operation it can cause distressing post op. You can try using a nose net on your mare when riding her.