I am indebted to the knowledge and help of Harry Elsinghorst from the Nationaal Veeteelt Museum, and Henk Bouwman, who both contacted me, independently from one another, as well as prof. P.A. Koolmees PhD (Faculty of Veterinary Medicine, Utrecht University) and Walter van den Holst, veterinarian. This is not to say that they necessarily agree with all the points put forward: the author remains responsible for the views expressed in this article. The Museum for Veterinary Medicine, Utrecht University, provided figure 6 and Nederinum bv (Riding Sports Gear) figure 3. Dr. Maaike Groot corrected my English and offered advice.