Please can anyone help. My friend has a mare that has recently started headshaking. Her vet has ruled out ear mites etc, as possible cause and the mare has also been to the Royal **** Vet School at Edinburgh and they can't find the cause either. The vet has said that he thinks the USA is about 2 years ahead of us in their knowledge of this condition, and possible causes, so please, if there is anyone out there who can offer possible solutions, or in the US and can direct me where to make enquiries I would be very very grateful. Also does anyone know of anywhere in the UK that has the equipment to do an MRI Scan on a horse. Thanks.