The Rough Collie (also known as the Long-Haired Collie) is a long-coated dog breed of medium to large size that, in its original form, was a type of collie used and bred for herding sheep in Scotland. Originating in the 1800s, Collie eye anomaly (CEA), a genetic disease which causes improper development of the eye and possible blindness, is a common ailment in the breed. More rarely, Rough Collies can be affected by progressive retinal atrophy (PRA), another genetic disease in which bilateral degeneration of the retina results in progressive vision loss culminating in blindness. Through genetic testing and careful screening program it would be theoretically possible to eradicate both of these problems in purebred lines, however, certainly in the UK, the Kennel Club does not require these tests to be done either for registration or showing. CEA is so prevalent that elimination of affected dogs except through very slow and careful breeding decisions to avoid shrinking the gene pool more than absolutely necessary.
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