In daylight he is fine: the ball in the park, the stairs, the lot. After dark he waits at the back door and will not step into the garden until you switch the light on.
Quick answer: Progressive retinal atrophy (PRA) is a group of inherited diseases in which the light-sensing cells of the retina die off, rods first, then cones. The first sign is night blindness, often in a young or middle-aged dog, and day vision follows over one to two years. It is painless and has no cure. A DNA test identifies the mutation in most affected breeds, and most dogs adapt well when the home stays predictable.
What is progressive retinal atrophy in dogs?
The retina has two kinds of light-sensing cell. Rods handle dim light and movement; cones handle daylight and detail. In PRA a gene error makes the rods degenerate first, which is why the earliest trouble is always the dark. The cones follow, the retina thins, and its blood vessels narrow.
As the retina thins, the reflective layer behind it (the tapetum) shows through more brightly. That is the eerie extra shine owners notice in photos. More than 30 different mutations have been identified across breeds, and they all lead to the same end point.
First signs of PRA in dogs
- Reluctance to go out at night or into a dark garden; waiting for the light to come on
- Bumping into things in dim rooms while getting around fine in daylight
- Staying close to walls, and following you more closely at dusk
- Wide pupils in normal light, and strongly reflective eyes in photos
- Later: missing treats, misjudging steps, bumping into things in daylight
Night blindness in a young or middle-aged dog of a listed breed is PRA until proven otherwise. Book an eye exam; it takes minutes.
PRA or just old eyes?
In a senior dog, trouble in the dark overlaps with normal aging, so the two get confused. A few differences help:
- PRA: night blindness that keeps getting worse, often starting before old age, with wide pupils and an extra-bright shine. The eyes can look clear until a cataract forms.
- Normal aging (nuclear sclerosis): a soft blue-grey haze in both eyes from 6 to 8 years and a little hesitation at dusk. It does not cause blindness. See nuclear sclerosis vs cataracts.
- Cataract: a white or crystal-like opacity you can see in the pupil.
Mention night trouble at the next vet visit either way. 12 signs your senior dog is losing vision has three home sight tests you can do first.
Which breeds get PRA?
- prcd-PRA (progressive rod-cone degeneration): the most widespread form. Poodles of all sizes, Labrador Retrievers, Cocker Spaniels, Portuguese Water Dogs, Australian Cattle Dogs, Chinese Cresteds and more.
- Golden Retrievers: their own mutations, GR-PRA1 and GR-PRA2.
- cord1: Dachshunds and English Springer Spaniels.
- Early-onset forms: rcd1 in Irish Setters, which blinds puppies within the first year; rcd2 in Collies.
- Other identified variants: Miniature Schnauzers, Siberian Huskies (an X-linked form), Tibetan Terriers, Papillons, Samoyeds and Norwegian Elkhounds.
- Mixed breeds: whichever forms their parents carried.
For every other eye condition by breed, see dog breeds prone to eye problems.
How is PRA diagnosed?
- Eye exam. An ophthalmologist sees the thinning retina, narrowed vessels and the over-bright tapetum.
- Electroretinogram (ERG). It measures the retina's electrical response to light. A reduced rod response confirms early PRA before the retina looks abnormal.
- DNA test. A cheek swab identifies known mutations in breeds where the gene has been found.
PRA DNA test results: clear, carrier or affected
Most forms of PRA are recessive: a dog needs two copies of the faulty gene to be affected.
- Clear: no copies of the tested mutation.
- Carrier: one copy. Carriers see normally all their lives, but can pass it on.
- Affected: two copies. The dog will develop PRA, even if his eyes are fine today.
Two carriers bred together can produce affected puppies, which is what screening breeding dogs prevents. Buying a puppy? Ask to see both parents' results. A result also matters later in life: if a cataract forms in an affected dog, surgery cannot restore sight behind a retina that no longer works.
PRA and cataracts
A degenerating retina is thought to release by-products that damage the lens, and many PRA dogs develop cataracts. The cataract does not need removing for sight, because the retina behind it is failing; this is one case where cataract surgery is not worth the cost. But a mature cataract can leak protein and cause lens-induced uveitis and glaucoma, so PRA dogs still need periodic eye checks even though PRA itself is painless.
Living with PRA: what to do this month
Blindness from PRA arrives slowly, which is the kindest way for a dog to lose sight. Use the time you have while he still sees in daylight.
- Add night lights now, along the routes he uses after dark.
- Freeze the floor plan. Furniture, bowls and beds stay where they are.
- Teach the cues while he can still see you. A "stop" cue on the lead, plus a word for "step up" and "step down" at kerbs and stairs.
- Use words before touching, especially from behind.
- Mark doors and stairs with texture: a mat, a rug, a different runner.
- Keep walk routes, times and lead side the same.
- Book periodic eye checks for secondary cataracts and pressure.
Most PRA dogs stay playful and confident. They lean on scent, hearing and memory, and the routine you build now becomes their map.
Look after the eyes he still uses
To be plain: no diet or supplement stops PRA, slows it, or brings night vision back. What daily nutrition can do is cover the basics for the rest of his eye while he is using it. His eyes run on a few nutrients his body cannot make on its own: the pigment that shields against glare, the antioxidant that cleans up daily wear, the fat that keeps the eye wet. The only way in is through what he eats. OcuLabs Vision Support Bites carry them in a chicken chew for dogs 7 and up.
- Comfortable, moist eyes. Omega-3 DHA 100 mg per two chews supports the tear film and eye moisture.
- Back-up for aging eye cells. Astaxanthin 1 mg gives antioxidant support where the daily wear happens.
- Bright-light support. Lutein 6 mg concentrates in the retina and helps filter blue light.
- Normal eye health, every day. Beta-carotene 1.5 mg adds antioxidant protection.
Give 2 to 4 chews a day depending on your dog's weight (the chart is on the jar and the product page), and run it past your vet or ophthalmologist. It is daily support, not a treatment for PRA.
Your first jar is covered for 90 days. Not happy, email support@ocupetlabs.com for a full refund of the product price, even if the jar is empty.
Keep reading
- Dog breeds prone to eye problems: what to watch for by breed
- Dog cataract surgery: cost, recovery and when it is worth it
- Best eye supplements for dogs: evidence, ingredients and how to choose
- 12 signs your senior dog is losing vision
- Nuclear sclerosis vs cataracts in dogs
Frequently asked questions
What are the first signs of PRA in dogs?
Night blindness: reluctance to go outside after dark, bumping into things in dim rooms, staying close to walls at night, and eyes that look unusually shiny because the pupils stay wide to gather light. Daytime vision is normal at first.
How long does it take a dog with PRA to go blind?
In most forms, day vision fades over one to two years after the night blindness starts. Early-onset forms are faster: the rcd1 form in Irish Setters blinds puppies within the first year.
Which breeds get progressive retinal atrophy?
Poodles, Labrador and Golden Retrievers, Cocker Spaniels, Miniature Schnauzers, Dachshunds, Portuguese Water Dogs, Irish Setters, Collies, Siberian Huskies, Tibetan Terriers, Papillons and many others, each with its own gene mutation. Mixed breeds inherit it too.
Is there a treatment for PRA in dogs?
There is no cure, and nothing proven slows it. Gene therapy is in research for some forms. Secondary cataracts are common and are monitored, and sometimes removed if they cause inflammation.
Is PRA painful for dogs?
No. PRA itself is painless and slow, which gives the dog time to adapt. Pain only appears if a secondary cataract triggers inflammation or glaucoma, which is why PRA dogs still need periodic eye checks.
General information for dog parents, not veterinary advice. If your dog's sight changes over days rather than months, or an eye looks red or painful, see your vet today.