Distichiasis is a condition where extra eyelashes grow from abnormal spots along a dog’s eyelid margin, right where the oil glands (meibomian glands) open. Normal eyelashes grow from the outer skin surface of the eyelid, but these misplaced hairs emerge from inside the lid edge and often brush directly against the surface of the eye. Some dogs live comfortably with soft, barely noticeable extra lashes, while others develop painful irritation that can eventually threaten their vision.
How Distichiasis Differs From Normal Lashes
A dog’s normal eyelashes curve outward, away from the eye. Distichia (the individual abnormal hairs) sprout from or near the meibomian gland openings along the inner lid margin, which means they tend to point toward or directly contact the cornea. These hairs can be fine and wispy or thick and stiff, and that stiffness largely determines how much trouble they cause.
Distichiasis is not the same as entropion, where the entire eyelid rolls inward. It’s also distinct from ectopic cilia, a related but more serious condition where lashes grow through the inside lining of the eyelid. All three problems can cause similar symptoms, so a proper diagnosis matters.
Signs to Watch For
The symptoms depend on how many extra lashes are present, how stiff they are, and where they contact the eye. Very soft distichia sometimes cause no symptoms at all and are discovered incidentally during a routine exam. When the hairs are stiff enough to irritate the cornea, though, you may notice:
- Excessive tearing or watery discharge from one or both eyes
- Squinting or blinking more than usual
- Redness and inflammation around the eye
- Pawing or rubbing at the face, which can make things worse
- Mucus-like or thick eye discharge
If the condition goes untreated over time, chronic friction from these lashes can cause visible changes to the cornea. White scarring, dark pigmentation, and tiny new blood vessels may form across the corneal surface. All of these changes reduce clarity and can ultimately impair your dog’s vision. In more severe cases, the constant rubbing can lead to corneal ulcers, which are painful open sores on the eye’s surface that carry a risk of deeper damage or even perforation.
Breeds Most Commonly Affected
Distichiasis has a genetic component, and certain breeds are far more prone to it. A retrospective study of 291 cases found the highest prevalence in English Bulldogs (35.2%) and American Cocker Spaniels (19.4%). Brachycephalic (flat-faced) dogs as a group had a prevalence of about 12%, compared to roughly 5% in non-brachycephalic breeds. English Bulldogs tended to have not just more frequent cases but more severe ones as well.
Other commonly affected breeds include Shih Tzus, Lhasa Apsos, Golden Retrievers, Miniature and Toy Poodles, and Cavalier King Charles Spaniels. If you have one of these breeds, it’s worth paying attention to any signs of eye irritation, especially in the first few years of life when the condition typically becomes apparent.
How It’s Diagnosed
Distichia can be extremely fine, sometimes barely visible to the naked eye. Veterinarians and veterinary ophthalmologists use a slit-lamp biomicroscope, which provides magnified, brightly illuminated views of the eyelid margin and corneal surface. This tool makes it possible to count the individual abnormal hairs and assess any damage they’ve caused to the cornea. A tear production test may also be performed to check whether the eye is producing enough moisture to buffer against irritation.
If your vet suspects distichiasis during a general exam, they may refer you to a veterinary ophthalmologist for a more detailed evaluation before recommending treatment.
When Treatment Is Needed
Not every dog with distichiasis needs treatment. If the extra lashes are fine and soft and the cornea shows no signs of irritation, your vet may simply recommend monitoring. Lubricating eye drops or ointments can help keep the cornea moist and reduce friction from soft hairs, serving as a reasonable approach for very mild cases.
Treatment becomes necessary when the lashes cause persistent tearing, visible discomfort, or any corneal changes. Leaving symptomatic distichiasis untreated risks progressive scarring and vision loss, so acting earlier tends to produce better outcomes.
Treatment Options and Success Rates
Several procedures exist, and they vary significantly in how well they prevent the lashes from returning.
Manual Plucking (Epilation)
The simplest option is physically plucking the offending hairs with fine forceps. This provides immediate relief but is strictly temporary. The lashes almost always grow back, typically within a few weeks, so epilation is generally used as a short-term fix while planning a more permanent solution.
Cryotherapy (Freezing)
Cryotherapy is one of the most commonly performed procedures for canine distichiasis. A freezing probe is applied to the inner surface of the eyelid to destroy the hair follicles. A large study of 125 dogs (234 eyes) treated with a triple-freeze technique found that a single treatment eliminated the abnormal lashes in 83% of eyes over a follow-up period averaging four months. Minor recurrence occurred in 17% of treated eyes. The procedure is done under general anesthesia and can cause temporary eyelid swelling, along with some loss of pigment at the lid margin in certain dogs.
Electrolysis
Electrolysis uses an electrical current to destroy individual hair follicles one at a time. It works best when only a few lashes are involved. However, the recurrence rate is notably higher. A study of 78 dogs treated with electrolysis found lashes returned in 65% of eyes. Lid margin scarring occurred in 33% and depigmentation in 27%. Radiofrequency-based electrolysis produces less collateral tissue damage than standard surgical electrocautery, which can cause significant scarring and is generally not recommended.
Surgical Excision
For more extensive or stubborn cases, surgical excision tends to produce the best long-term results. One approach involves splitting the eyelid into its front and back layers to expose the hair roots directly, then removing them under magnification. This technique avoids cutting into the inner eyelid lining, which reduces the risk of the lid margin scarring inward (a complication called entropion) after surgery. Another approach removes a small strip of tissue from the inner lid surface to eliminate the follicles entirely. Both methods have higher success rates than electrolysis or cryotherapy alone, though they require more surgical expertise.
Recovery After Treatment
After cryotherapy or surgical procedures, you can expect some eyelid swelling for several days. Your dog will likely need to wear an Elizabethan collar (cone) to prevent scratching or rubbing at the treated area. Antibiotic eye ointment and lubricating drops are typically prescribed for the first week or so to prevent infection and keep the healing tissue comfortable.
Most dogs recover within one to two weeks, though follow-up exams are important. Your vet will want to check that the cornea is healing, that no new lashes are emerging, and that the eyelid margins haven’t scarred into an abnormal position. Because distichiasis involves follicles that may not all be active at the same time, new lashes can sometimes appear from previously dormant follicles weeks or months after an otherwise successful procedure. This doesn’t necessarily mean the original treatment failed, but it may require a touch-up session.
Long-Term Outlook
Most dogs do well after treatment, especially when the condition is caught before significant corneal damage develops. The key variable is recurrence. Cryotherapy and surgical excision offer the best odds of a lasting fix, but no method guarantees that every follicle is permanently eliminated. Dogs with extensive distichiasis, particularly brachycephalic breeds, may need more than one procedure over their lifetime.
If your dog has been diagnosed with distichiasis but currently shows no symptoms, regular eye exams (at least once or twice a year) help catch any progression early. Corneal scarring and pigmentation, once established, don’t fully reverse, so the goal is always to treat before those changes take hold.