Progressive Retinal Atrophy (PRA) in Old English Sheepdogs

PRA is a group of inherited diseases in which the retina's photoreceptor cells, the rods and cones responsible for detecting light, gradually degenerate over time. Because rod cells, responsible for low-light vision, are typically affected first and most severely, the earliest and most reliable sign is often night blindness: a dog that used to move confidently in a dim room or at dusk starts bumping into furniture or hesitating at the top of dark stairs. This is a meaningfully different mechanism than a cataract, which physically clouds the lens and can often be seen as a visible haze or bluish tint in the pupil. PRA, by contrast, frequently shows no visible change to the eye's appearance at all in its earlier stages, even as functional vision is already declining, which is exactly why it's so often missed until vision loss is fairly advanced.

A veterinary ophthalmologist can often identify characteristic retinal changes during a dilated eye exam, and electroretinography, a test measuring the retina's electrical response to light, can confirm reduced photoreceptor function even before changes are visible on exam. Genetic testing exists for some of the specific mutations known to cause PRA in various breeds, though its applicability depends on which mutation, if any, is relevant to a given dog's case. There's no treatment that reverses or halts PRA's progression, which typically continues toward complete blindness over months to a couple of years, but affected dogs generally adapt remarkably well to vision loss, particularly in a familiar home environment, making quality of life a real and achievable focus even without a treatment for the underlying disease.

If you think your Old has progressive retinal atrophy (pra), the plan is three steps: write down what you have seen and when it started, book a veterinary appointment rather than waiting for the next flare, and take video of the behaviour or symptom before you go — the thing you are worried about rarely happens in the consulting room. Screening in the parents covers hip dysplasia, cataracts, hypothyroidism.

What the vet visit should produce is a diagnosis and a written plan, not just reassurance: what is being ruled out, what the monitoring interval is, and which signs mean you come back sooner. Ask what the treatment costs across a year rather than per visit, because that is the number that decides whether you are managing this condition or reacting to it.

Between appointments, keep a short log — dates, what you saw, what changed. It is the single most useful thing an owner brings to a follow-up, and for progressive retinal atrophy (pra) it is often what separates a clear pattern from a guess.