First order of business is to be sure who the parents are. As I recall, that post incorrectly named the wrong dog as sire. A subsequent post listed the correct sire, who as I also remember, had DM. Second order of business is to be sure it's really DM. There are other spinal issues with some of the some symptoms but are not DM. There are a lot of articles out there on DM and mode of inheritance. For every article I put into the Red Book on a health issue, I probably read dozens of others on the same health issue in order to use the best article. I have yet to find any articles proving the test results wrong. However, in my own personal research of dogs tested (OFA listings and personal knowledge of some dogs), the results seem to coincide with known DM lines. Just like tracing back a black factor or coat factor in pedigrees, it seems possible to trace back the DM factor and in some cases predict the outcome of the test with accuracy. Liz _www.lealynn.com_ (http://www.lealynn.com/) GSDCA member since 1976 Signers of the Breeders Code AKC Breeder of Merit In a message dated 12/9/2011 7:35:37 A.M. Pacific Standard Time, ELG440@xxxxxxx writes: When we get a dog with DM tested markers from two parents who tested clear, what do we do? ============================================================================ POST is Copyrighted 2011. All material remains the property of the original author and of GSD Communication, Inc. NO REPRODUCTIONS or FORWARDS of any kind are permitted without prior permission of the original author AND of the Showgsd-l Management. ALL RIGHTS RESERVED. Each Author is responsible for the content of his/her post. This group and its administrators are not responsible for the comments or opinions expressed in any post. ALL PERSONS ARE ON NOTICE THAT THE FORWARDING, REPRODUCTION OR USE IN ANY MANNER OF ANY MATERIAL WHICH APPEARS ON SHOWGSD-L WITHOUT THE EXPRESS PERMISSION OF ALL PARTIES TO THE POST AND THE LIST MANAGEMENT IS EXPRESSLY FORBIDDEN, AND IS A VIOLATION OF LAW. VIOLATORS OF THIS PROHIBITION WILL BE PROSECUTED. For assistance, please contact the List Management at admin@xxxxxxxxxxx VISIT OUR WEBSITE - http://showgsd.org SUBSCRIPTION:http://showgsd.org/mail.html NATIONAL BLOG - http://gsdnational.blogspot.com/ ============================================================================