I came across these two relatively new forums that might be of interest to our German-speaking members and readers. One is focused entirely on SM & EF while the other has sections and information on health issues as well as other cavalier topics:
http://www.syringomyelia.hack-webdesign.de/forum/index.php?page=Index
http://cavaliere-in-not.de/wbb2/index.php
http://www.syringomyelia.hack-webdesign.de/forum/index.php?page=Index
http://cavaliere-in-not.de/wbb2/index.php