Pre-order book from Netherlands includes research, treatment etc http://www.stoethoeve.nl/stichting-saartje/book/
The GSD for 1, the Sarloos and Czech Wolf dogs are tested in Netherlands I believe also US so less risks of producing a pup with PD
We have to dwarf boarder collies at work. Not owned by the same person or from the same place. Didnt even know dogs could have it till the owners explained it to me.
A friend of mine had one, bless he lost most of his hair his skin was raw, forever at the vets, but was happy wee soul, he died at 6. There are a few Gsd UK breeders testing for dwarfism which is good to see.