Understanding Collie Eye Anomaly in Dogs

Collie eye anomaly (CEA) is an inherited eye condition that primarily affects herding breeds like Rough Collies, Shetland Sheepdogs, and Border Collies. It develops before birth, disrupting the normal formation of the choroid, a layer of tissue beneath the retina that supplies it with blood and nutrients. Severity varies widely, from mild cases that don’t affect your dog’s vision at all to more serious forms that can lead to vision loss. While there’s no cure for CEA, understanding what it is and how it progresses can help you make confident decisions for your dog.

What is Collie Eye Anomaly?

Collie eye anomaly, or CEA, is a hereditary eye disorder that affects the development of the choroid, the layer of the eye responsible for delivering blood and nutrients to the retina, the light-sensitive tissue at the back of the eye. Dogs with CEA are born with the condition. The choroidal abnormality itself is non-progressive, meaning it doesn’t get worse, but in some dogs CEA can lead to complications like colobomas, which are small pits or gaps in the eye’s structures, that can increase the risk of retinal detachment over time. While mild cases typically have normal or near-normal vision, severe cases can lead to significant vision loss.

CEA is autosomal recessive, which means a dog needs to inherit two copies of the affected gene, one from each parent, to show signs of the condition. Dogs that inherit only one copy are called carriers. They won’t have any symptoms themselves, but they can pass the gene on to their puppies.

Symptoms of Collie Eye Anomaly

In mild cases, you might not notice any symptoms at all. These dogs lead normal lives with healthy vision. However, more pronounced cases might show:

• Your dog bumping into furniture or objects.
• Apparent difficulty navigating in dim lighting.
• Visible abnormalities in the eyes, such as a sunken appearance or unusual discoloration.
• Sudden or progressive vision loss in severe cases caused by retinal detachment.

Because mild cases can appear normal, early veterinary examination is critical-ideally before a puppy reaches 7 weeks old.

Which Breeds are Affected?

Collie eye anomaly is most commonly seen in herding breeds, including:

• Rough Collies and Smooth Collies (highest prevalence)
• Shetland Sheepdogs
• Border Collies
• Australian Shepherds
• Boykin Spaniels
• Nova Scotia Duck Tolling Retrievers

If you have one of these breeds, routine genetic testing can be useful to determine their risk for CEA, whether for potential breeding or general health awareness.

How is Collie Eye Anomaly Diagnosed?

CEA is typically diagnosed in one of two ways:

• Ophthalmic exams: A veterinary ophthalmologist can examine a puppy’s eyes, ideally before 7 weeks old. As puppies mature, pigment development can mask milder abnormalities, making early examination critical.
• Genetic testing: A DNA test, done via a simple cheek swab or blood sample, can identify whether a dog is clear, a carrier, or affected. This test is reliable at any age and doesn’t require early timing to be accurate, making it especially useful for adult dogs and breeding decisions.

Managing and Treating Collie Eye Anomaly

There’s no cure for CEA itself, but management focuses on adapting based on severity:

• Mild cases: Most dogs live completely normal lives without treatment. Owners simply monitor for any changes in vision over time.
• Retinal detachment: In some cases, surgical reattachment may be attempted if the detachment is caught early, but outcomes vary and depend on the extent and timing of the detachment. Your veterinary ophthalmologist can advise whether surgery is appropriate for your dog.
• Environmental adaptation: For dogs with vision impairment, keeping furniture placement consistent and opting for stable lighting conditions can help them navigate their surroundings.

It’s a good idea to work closely with a veterinary ophthalmologist to create the best care plan for your dog.

What Does CEA Mean for Breeding?

To reduce the likelihood of passing on CEA, breeders should confirm their dogs’ genetic status before breeding:

• Affected dogs: Should not be bred to other affected dogs or carriers.
• Carriers: Can be bred only to dogs with normal genetic results.
• Clear dogs: Free of the CEA gene-ideal for breeding programs aiming to reduce its prevalence.

The Orthopedic Foundation for Animals (OFA) offers eye certification through their Companion Animal Eye Registry (CAER) program, which provides helpful documentation for responsible breeders.

What About Pet Insurance for CEA?

Yes, CEA is covered under Lemonade Pet’s base accident and illness policy, as long as it isn’t pre-existing. Getting a policy in place while your dog is symptom-free is the clearest path to making sure you’re covered. Once signs appear, the condition is typically considered pre-existing and won’t be eligible for coverage.

And if CEA does end up being considered pre-existing, a policy can still cover a wide range of other illnesses and accidents that come up over the course of your dog’s life. It’s still well worth having, especially if your pup is otherwise healthy.

Before we go

A CEA diagnosis can feel like a lot to take in, but for many dogs it changes very little about their day-to-day life. Mild cases are common, and most affected dogs live full, happy lives. Whether you’re managing a diagnosis, considering genetic testing, or just trying to understand what this means for your dog, your vet and a veterinary ophthalmologist are your best resources. Reach out to them early, ask lots of questions, and know that you have options.

Frequently Asked Questions

A few quick words, because we <3 our lawyers: This post is general in nature, and any statement in it doesn’t alter the terms, conditions, exclusions, or limitations of the policies issued, which differ according to your state of residence. You’re encouraged to discuss your specific circumstances with your own professional advisors. The purpose of this post is merely to provide you with info and insights you can use to make such discussions more productive! Naturally, all comments by, or references to, third parties represent their own views, and Lemonade assumes no responsibility for them. Coverage may not be available in all states. Please note that statements about coverages, policy management, claims processes, Giveback, and customer support apply to policies underwritten by Lemonade Insurance Company or Metromile Insurance Company, a Lemonade company, sold by Lemonade Insurance Agency, LLC.  The statements do not apply to policies underwritten by other carriers.