In fact I was thinking about what would be a clever breeding program regarding DM for CSV, because if one looks at OFA statistic for GSD here it is (
http://www.offa.org/dnateststats.html ):
GERMAN SHEPHERD DOG
CLEAR 213 46%
CARRIER 151 33%
AT RISK 98 21%
TOTAL ABNORMAL 249 54%
TOTAL TESTED 462
So 54% abnormal...