# Progressive Retinal Atrophy in Dogs: Symptoms and Stages Progressive retinal atrophy in dogs symptoms usually begin with trouble seeing in dim light, then slowly worsen until your dog loses vision completely. It is an inherited, non-painful disease, and most dogs adjust well with a few changes at home [1]. This article is educational and is not a substitute for veterinary diagnosis or treatment. ## Quick Answer - PRA is an inherited eye disease that damages the retina and leads to blindness over months to years [1]. - The first sign is often poor night vision, such as bumping into things after dark or hesitating on stairs. - Both eyes are affected equally, and the condition does not cause pain [1]. - There is no cure, but most dogs adapt well to vision loss and keep a good quality of life [1]. - A veterinary eye exam confirms the diagnosis, and a specialist may use electroretinography (ERG) for extra testing [1]. ## What Is Progressive Retinal Atrophy in Dogs? PRA is a group of inherited diseases that damage the light-sensing cells in the retina, the thin layer at the back of the eye that turns light into signals the brain can read [1]. The rods, which handle dim-light and night vision, are usually hit first. The cones, which handle bright light and color, tend to follow. Because the disease moves slowly, many owners miss the earliest changes. Your dog may still see fine in daylight while struggling at dusk or in a dim hallway. Over time, the damage spreads and vision fades further. PRA is not painful. Your dog will not squint, paw at the eyes, or act like something is stuck in the eye. That is one reason it can be easy to overlook at first. A less common form appears in puppies born with rods or cones that never develop properly. These cases are called retinal dysplasia, and blindness comes on much faster [1]. Some people still call these cases PRA. Either way, all genetic forms of PRA eventually progress to complete blindness [1]. ## Progressive Retinal Atrophy in Dogs Symptoms: What Owners Notice First The signs below tend to appear in a rough order, though every dog moves through them at a different pace. ### Early signs - Trouble seeing in low light, such as at night or in a dark room - Hesitating at the top of stairs or at curbs - Bumping into furniture in dim areas - A reluctance to go outside after dark - Eyes looking normal to you, with no redness or discharge ### Middle signs - Clumsiness in familiar places, even in daylight - Startling easily when approached from the side - Standing still and scanning the room with the head - Changes in how your dog plays or moves through the house ### Late signs - Bumping into walls, doors, and people - Reluctance to walk in new places - Cloudy-looking eyes, which can happen if cataracts form late in the disease [1] Cataracts can develop in the late stages of PRA [1]. If the lens becomes cloudy, it can block the veterinarian's view of the retina, which makes diagnosis trickier. If you notice redness, squinting, or a sudden change in one eye only, that points more toward other eye problems. You can read about those in [Canine Glaucoma: Diagnosis and Management](/knowledge/veterinary-medicine/clinical-methods/canine-glaucoma-diagnosis-management) and [Eye Goop In Dogs](/knowledge/veterinary-medicine/clinical-methods/eye-goop-in-dogs). ## What Causes Progressive Retinal Atrophy in Dogs? PRA is caused by gene changes your dog inherits from its parents [1]. It is not caused by injury, infection, or diet. It is not contagious, and it cannot spread from one dog to another. Different breeds carry different faulty genes. Researchers have found a specific gene change in a litter of Labrador retrievers with PRA [2]. A separate gene change causes an X-linked form of PRA in English Cocker Spaniels, in which affected males inherit the disease through their mothers [3]. More than one hundred breeds can be affected by some form of PRA, and genetic tests exist for many of the known variants [4]. Some breeds carry gene variants that change how fast the disease moves. Variants in two genes, RPGRIP1 and MAP9, are linked to a form of PRA and can modify how the disease develops and progresses [5]. ### Risk factors - Breed. Certain breeds and family lines carry PRA genes. - Family history. Affected parents or siblings raise the risk. - Sex. Most forms affect males and females equally, but X-linked forms hit males harder [3]. If you know your dog's breed or breed mix, ask your veterinarian whether a genetic test makes sense. Testing can tell you if your dog carries a PRA gene even before any vision changes appear. ## How PRA Is Diagnosed Your veterinarian starts with a full eye exam, including a close look at the retina at the back of the eye [1]. Both eyes are affected equally in PRA, which helps separate it from other conditions [1]. If the diagnosis is unclear, or if cataracts block the view of the retina, your veterinarian may refer you to a veterinary eye specialist. The specialist can run extra tests, such as electroretinography (ERG), which measures how the retina responds to light [1]. Other tests may include: - A DNA test to look for known PRA gene variants [4] - Blood pressure checks and lab work, since other diseases can affect the retina [6] Retinal disease in dogs can also stem from inherited problems, trauma, metabolic issues, infections, tumors, blood disorders, high blood pressure, and nutritional deficiencies [6]. That is why a careful exam matters. Not every dog with vision loss has PRA. ### A simple comparison of common vision-loss conditions | Feature | PRA | Sudden acquired retinal degeneration syndrome (SARDS) | |---|---|---| | Speed of onset | Slow, months to years [1] | Rapid [7] | | First sign | Poor night vision [1] | Sudden blindness, often in days | | Pain | None [1] | None | | Both eyes | Yes, equally [1] | Yes | | Diagnosis | Eye exam, ERG, DNA tests [1][4] | ERG and eye exam [8] | SARDS causes fast vision loss and outer retinal damage, which is very different from the slow decline of PRA [7]. If your dog went blind over a weekend, that pattern points away from PRA. ## Progressive Retinal Atrophy in Dogs Treatment: What Can Be Done There is no cure for PRA right now [1]. No medication, surgery, or diet reverses the damage. Treatment focuses on two things: keeping your dog comfortable and helping it get around safely. Your veterinarian may suggest: - Extra lighting inside and outside the house, which can help in the early stages when only night vision is affected [1] - A referral to a veterinary eye specialist for monitoring - Regular eye exams to track the disease and watch for cataracts [1] - Genetic testing if you plan to breed your dog Some owners ask about supplements or special diets. No product in the current evidence reverses PRA. Talk with your veterinarian before starting anything, and never give a supplement or drug without guidance. If a medication is ever prescribed, your veterinarian calculates the dose from your dog's weight and health. If your dog has other chronic conditions, keeping those managed helps overall comfort. You can read more in [Dog Kidney Disease: What Do the Stages Mean for Your Dog?](/knowledge/veterinary-medicine/senior-and-chronic-care/dog-kidney-disease-stages) and [Dog Heart Disease: What Are the Stages and What Do They Mean?](/knowledge/veterinary-medicine/senior-and-chronic-care/dog-heart-disease-stages). ## Progressive Retinal Atrophy in Dogs Stages and Life Expectancy PRA does not have official numbered stages the way some other diseases do. Instead, veterinarians and owners describe it in phases based on what your dog can still see. ### Stage 1: Night vision loss The rods fail first, so dim-light sight goes before daylight sight. Your dog may seem fine all day and only struggle after sunset. ### Stage 2: Daytime vision loss The cones start to fail. Your dog may misjudge distances, bump into things in bright rooms, or seem unsure on walks. ### Stage 3: Near-total to total blindness Vision is largely or fully gone. Many dogs at this stage still get around a familiar home well because they memorize the layout. ### Life expectancy PRA itself does not shorten a dog's life. It is not a fatal disease, and it does not spread to other organs. Most dogs adapt well to their vision loss and continue to have a good quality of life [1]. A dog with PRA can live a normal lifespan with good care and a safe home. The bigger risks come from accidents, such as falls or getting startled in traffic. Managing those risks is the main job of long-term care. ## Living With a Dog That Has PRA Blind dogs can do remarkably well. Their noses and ears pick up the slack. Here is how to set your dog up for success. - Keep furniture in the same place. Moving the couch can cause a crash. - Use baby gates or closed doors to block stairs and pools. - Add night lights or lamps in hallways and yards [1]. - Talk to your dog before you touch it, so you do not startle it. - Use a short leash and a harness on walks, and keep your dog close near roads. - Teach words like "step," "curb," and "wait" to cue obstacles. - Keep food, water, and bed in fixed spots. - Ask about a halo harness or a scent trail to mark paths. Dental and skin care still matter, even if your dog cannot see. You can read about home care in [Dog Dental Disease: Signs, Stages, and What You Can Do](/knowledge/veterinary-medicine/preventive-and-routine-care/dog-dental-disease-signs-stages-and-what-you-can-do). ## Prevention You cannot prevent PRA in a dog that already carries the genes. The disease is inherited, and it starts before any signs show [1]. What you can do is stop it from passing to the next generation. - Test breeding dogs for known PRA gene variants before mating [4]. - Ask breeders for test results on both parents. - Tell your veterinarian if a parent or sibling has been diagnosed. - Consider DNA testing for your own dog, especially if you might breed it. Genetic tests are available for many PRA variants, and testing has been used across many breeds [4]. If your dog tests as a carrier, it will not develop the disease in most cases, but it could pass the gene to puppies. ## Limitations and When to Contact a Veterinarian This article cannot tell you what is happening in your dog's eyes. Only a veterinarian can examine the retina and confirm a diagnosis. Individual cases need a veterinarian. Contact your veterinarian right away if you notice: - Sudden vision loss, especially over hours or a few days - Redness, squinting, or a cloudy eye - A pupil that stays wide open and does not react to light - Your dog bumping into things much more than usual - Any behavior change that comes on fast Call an emergency clinic now if your dog: - Goes blind in one or both eyes within a day - Has a bulging or very painful eye - Cannot stand or seems disoriented - Was hit by a car or fell after a vision-related accident Schedule a routine visit if you notice: - Slow, gradual trouble seeing at night - Hesitation on stairs or in dim rooms - A family history of PRA - You want to discuss genetic testing before breeding ## Frequently Asked Questions ### Can PRA in dogs be cured? No, there is no cure for PRA at this time [1]. Treatment centers on safety, home changes, and regular eye exams. Most dogs still live full, comfortable lives after losing their sight [1]. ### Is PRA painful for my dog? No, PRA does not cause pain [1]. Your dog will not squint or paw at its eyes because of the disease itself. If you see those signs, something else is going on and your dog needs an exam. ### Will my dog go completely blind? Yes, all genetic forms of PRA eventually lead to complete blindness [1]. The timeline varies by breed and by the specific gene involved. Some dogs lose vision over a few years, while others decline faster. ### Can I still walk my dog after it goes blind? Yes, most blind dogs still enjoy walks. Use a harness and a short leash, keep your dog close near roads, and stick to familiar routes. Cue your dog with words for curbs and steps so it knows what is coming. ### Should I breed a dog that carries a PRA gene? Talk with your veterinarian before breeding any dog that carries a PRA variant. Genetic testing can show whether a dog is clear, a carrier, or affected [4]. Breeding decisions should use those results to avoid producing affected puppies. ## Related Articles - [Canine Glaucoma: Diagnosis and Management](/knowledge/veterinary-medicine/clinical-methods/canine-glaucoma-diagnosis-management) - [Eye Goop In Dogs](/knowledge/veterinary-medicine/clinical-methods/eye-goop-in-dogs) - [Dog Kidney Disease: What Do the Stages Mean for Your Dog?](/knowledge/veterinary-medicine/senior-and-chronic-care/dog-kidney-disease-stages) - [Dog Dental Disease: Signs, Stages, and What You Can Do](/knowledge/veterinary-medicine/preventive-and-routine-care/dog-dental-disease-signs-stages-and-what-you-can-do) - [Dog Heart Disease: What Are the Stages and What Do They Mean?](/knowledge/veterinary-medicine/senior-and-chronic-care/dog-heart-disease-stages) - [Dog Eye Injury: Redness, Swelling, or Discharge?](/knowledge/veterinary-medicine/online-vet-and-care-costs/dog-eye-injury-redness-swelling) ## References 1. [Progressive retinal atrophy](https://www.vet.cornell.edu/departments-centers-and-institutes/riney-canine-health-center/canine-health-topics/progressive-retinal-atrophy). Cornell University College of Veterinary Medicine. 2. [GTPBP2 in-frame deletion in canine model with non-syndromic progressive retinal atrophy](https://pubmed.ncbi.nlm.nih.gov/39971978/). Scientific reports, 2025. 3. [Deletion in CACNA1F gene causes X-linked progressive retinal atrophy in English Cocker Spaniel dogs](https://pubmed.ncbi.nlm.nih.gov/41882631/). BMC veterinary research, 2026. 4. [Genotypic and allelic frequencies of progressive rod-cone degeneration and other main variants associated with progressive retinal atrophy in Italian dogs](https://pubmed.ncbi.nlm.nih.gov/38028226/). Veterinary record open, 2023. 5. [Frequency of RPGRIP1 and MAP9 genetic modifiers of canine progressive retinal atrophy, in 132 breeds of dog](https://pubmed.ncbi.nlm.nih.gov/38752391/). Animal genetics, 2024. 6. [Disorders of the Retina, Choroid, and Optic Disk (Ocular Fundus) in Dogs - Dog Owners](https://www.merckvetmanual.com/dog-owners/eye-disorders-of-dogs/disorders-of-the-retina-choroid-and-optic-disk-ocular-fundus-in-dogs). Merck Veterinary Manual. 7. [Histopathologic and ultrastructural features of the choriocapillaris in dogs with sudden acquired retinal degeneration syndrome and progressive retinal atrophy](https://pubmed.ncbi.nlm.nih.gov/41047609/). Veterinary pathology, 2026. 8. [Longitudinal Evaluation of Chromatic Pupillometry and Retinal Thickness in Dogs With Sudden Acquired Retinal Degeneration Syndrome](https://pubmed.ncbi.nlm.nih.gov/42609090/). Veterinary ophthalmology, 2026. ## Further Reading - [Merck Veterinary Manual: Dog Owners](https://www.merckvetmanual.com/dog-owners) - [Cornell Richard P. Riney Canine Health Center: Canine Health Information](https://www.vet.cornell.edu/departments-centers-and-institutes/riney-canine-health-center/canine-health-information) - [American Veterinary Medical Association: Pet Care](https://www.avma.org/resources-tools/pet-owners/petcare)