English Shepherd puppy (IMAGE) University of Cambridge Caption Dogs with progressive retinal atrophy have normal sight at birth, but by the age of four or five they will be totally blind. There is no treatment. Credit University of Cambridge Usage Restrictions With credit License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.