There were 30 CsW’s tested for Pituitary Dwarfism.
Of these 30 CsW’s were 6 carriers of the mutated gen.
On the site wolfdog-healthinfo.org you can find the test results. Click 
HERE
Because 1/5 of the tested dogs was carrier, it is very useful to test more CsW’s! 
Only then we can see how this disease is spread in the population  
 And it is entirely useful  for breeders to test for breeding!
And it is entirely useful  for breeders to test for breeding!
And especial when you want to breed with offspring, brother/ sisters, parents and ancestors of carriers of dwarfism gen.
But even when a male or female is carrier, it is no problem to breed with them!
Not any carrier has to excluded for breeding! 
Only don’t make combinations of carrier x carrier!
On top of this topic you can find how an owner can test a CsW for Pituitary Dwarfism.
And you also can find there a link for the blood sample form.