Progressive Retinal Atrophy

What It Is

Progressive Retinal Atrophy (PRA) is a genetic condition that causes the retina—the part of the eye responsible for vision—to deteriorate over time. Think of it like a slow dimming of the lights, eventually leading to complete blindness. It’s painless, which is good, but devastating for both dog and owner. PRA affects at least 103 dog breeds, and while the age of onset varies, most dogs start showing signs between 1 and 8 years old. The disease is inherited, usually in an autosomal recessive pattern—meaning a dog needs to inherit two copies of the faulty gene (one from each parent) to develop it. There’s no cure, but knowing your breed’s risk can help you plan ahead.

Symptoms to Watch For

Early signs can be easy to miss. You might notice your dog hesitating in dim light or at night—bumping into furniture, avoiding dark rooms, or seeming “startled” in low-light conditions. That’s because PRA typically starts with night blindness. As it progresses, your dog’s pupils may stay dilated more often, and you might see a shiny reflection in their eyes (called tapetal hyperreflectivity) from light bouncing off the thinned retina. Eventually, daytime vision fades too. Most dogs adapt surprisingly well using their other senses, especially smell and hearing, but it can still be tough emotionally. The timeline varies—some dogs go blind within a year of first symptoms, others take several years.

Diagnosis

If you’re seeing these signs, your vet will likely refer you to a veterinary ophthalmologist. The gold standard for diagnosis is an electroretinogram (ERG), which measures the retina’s electrical response to light—kind of like an EKG for the eye. It’s very accurate but can cost $300–$600 and usually requires sedation. A thorough eye exam with an indirect ophthalmoscope can also reveal telltale changes like retinal thinning or blood vessel narrowing. The best part? Many cases can be caught before symptoms appear through genetic testing. A simple cheek swab or blood test can identify if your dog carries the gene mutation—some tests even distinguish between clear, carrier, and affected status. These genetic panels run $60–$150, depending on the lab and breed.

Treatment Options

Here’s the hard truth: there’s no treatment that stops or reverses PRA. No medication, no surgery, no supplement has been proven to halt the progression. Some vets suggest antioxidants like omega-3s or vitamins A and E, but evidence is anecdotal at best. The focus is on management—helping your dog adjust to vision loss. Keep furniture in the same place, use scent markers or tactile cues (like rugs), and stick to consistent routines. Most dogs do remarkably well in familiar environments. If you’re dealing with secondary anxiety or disorientation, your vet may recommend behavioral support or anti-anxiety meds, but these don’t treat PRA itself—just the side effects.

Prevention and Screening

This is where you, as a prospective owner, have real power. Breeding dogs should be genetically tested before they’re bred. Reputable breeders will provide proof of PRA testing—don’t hesitate to ask. Avoid breeders who say “we’ve never had a problem” without test results. For your own dog, especially if they’re from a high-risk breed, a one-time genetic test gives you lifetime clarity. If your dog is a carrier (has one copy of the gene), they won’t get PRA but could pass it to offspring—so spay/neuter discussions matter. Annual eye exams by a board-certified ophthalmologist (CVO exam) are also wise for at-risk breeds, even if they test clear genetically, since new mutations can pop up. Those exams run $150–$250 a year.

Breeds Most at Risk

PRA hits herding breeds hardest—23 affected breeds in that group alone. That includes Australian Shepherds, Border Collies, and all four Belgian breeds (Malinois, Tervuren, Sheepdog, Laekenois). Sporting and Foundation Stock Service breeds are also heavily represented. Among the big names: Akitas, Basenjis, Bernese Mountain Dogs, and American Eskimo Dogs. Even some Toy breeds like Poodles and Papillons are on the list. If you’re considering one of these breeds, PRA should be non-negotiable on your health checklist. Ask for OFA (Orthopedic Foundation for Animals) eye certification or results from labs like OptiGen or Paw Print Genetics. It takes five minutes to check, but it could save you years of heartache.