I found this series on youtube which shows the inheditary diseases among pedigree dogs, there are a big part of that series focused on the Rhodesian Ridgeback and the ridge in paticular - and about weather the ridge as such is a genetic flaw .. they do mention DS also ..
A program thats hard to see - due to the visible suffering of many of the dogs/breeds mentioned but very informatory as well ...
You find it at Youtube.com - search : Pedigree dogs exposed
Its a series of 6 times 10 minutes.
I would love to hear your responses to what you see..
NjoyDK