Studies have shown that approximately 70 to 97 percent of rough and smooth collies in the United States and Great Britain have at least one copy of the mutation that causes CEA, and approximately 68 percent of Rough Collies in Sweden are affected. (animalgenetics.us)
Short haired dogs, such as Labrador Retrievers, can shed as much (if not more) than longer haired breeds such as Rough Collies. (petpeoplesplace.com)
Pet Shop Puppies: Buying a Puppy From a Pet Store I've seen plenty of Rough Collies in pet shops, but only one Smooth Collie. (yourpurebredpuppy.com)