
More rough collies than border collies suffer this, but you do need to be aware of it if you have a herding breed... it can include GSDs, Lancashire Heelers, Tollers, shelties etc etc... there's a list somewhere, but percentage wise, roughs suffer more and I believe that the test is now included in their health requirements... which it's not on the border collie.
Border collies do have other issues which can be tested for
TNS - all breeding dogs should be tested for this - DNA test will say if a dog is clear or a carrier (affected pups don't live long enough for testing to be an issue)
CL - although rarer in UK than Australia, this is another DNA testable disease, affected dogs will live 3 or 4 years about
CEA - collie eye - DNA test to establish if clear, carrier or affected
gonioscopy - to test if narrow angled glaucoma could be a problem - various levels of clear to bad.... affected dogs will lose their sight and eventually their eyes
Being a carrier for TNS/CL or CEA isn't the end of the world, but important to know. It's the end of a pups life if two TNS or CL carriers are put together and the genes produce affected pups.
Other issues to watch out for are epilepsy, deafness and HD