
As John says - it's not confined to flatcoats, but the Flatcoat Society are a pretty consciencious lot, and possibly have maybe done more work on it than other breeds. so shout more.
In my own mind, I'm convinced it's a susceptibility to something environmental, but don't ask me what. Maybe just some lines are more susceptible than others. If only we knew what caused it in humans as well........
Jo and the Casblaidd Flatcoats