http://www.medstats.dmu.ac.uk/headshaking - A detailed and well
written source of information is available from "The Epidemiology
of Equine Head shaking" at De Montfort University in Leicester
U.K. in their Department of Medical Statistics. Katy says she would
appreciate it if you would fill out her questionnaire.
http://www.vetnet.ucdavis.edu/ceh/headshaking.html - This is the home page for Dr John Madigan at the UofC Davis. He is probably the worlds foremost expert on head shaking syndrome. This page is his questionnaire. We recommend that you fill it out & mail it to him.
http://www.horsetalk.co.nz/health/tha-shake.shtml - Equine New & Views Newsletter
http://www.equinevetnet.com/animalscience/behavior/papers/headshaking.html - Horsetalk World Equestrian News in New Zealand has two articles.
The first, a small article reprinted from the Horseman's advisor.
The second contains some statistical information and was written
(I believe) by Dr. John Madigan DVM - UofC Davis.
http://www.usask.ca/wcvm/herdmed/applied-ethology/behaviourproblems/headshake.html - Limited information is available in an article written by Bob
http://www.taranet.co.uk/homeopathy.htm - General alternative therapy
information site in the U.K. with links to providers and suppliers
is available. This features an ailments page with links to useful
sites that are deal with specific problems that don't use drugs
as a method of treatment: Taranet Directory Alternative Animal Therapies: