Home » Diseases » In dogs » Distichiasis, Ectopic Cilia, and Trichiasis (Misgrowth of Eyelashes)

Distichiasis, Ectopic Cilia, and Trichiasis (Misgrowth of Eyelashes) in Dogs

Occurrence: common
Location of illness: Head/Neck

Author: Dr. med. vet. Gisa Löwe | Last modified: 06.11.2025

Distichiasis, ectopic ciliaCilia are fine, hair-like structures found on the surface of cells. They move rhythmically to move fluids across the cell surface or to propel the cell itself., and trichiasis are eye conditions in dogs caused by abnormal growth of eyelashes or hairs that can irritate the eye.

The most important facts at a glance

Distichiasis, ectopic cilia, and trichiasis are eye diseases in dogs caused by abnormal eyelash or hair growth. Distichiasis occurs when extra eyelashes grow from the meibomian glands in the eyelid and irritate the eye. Ectopic ciliaCilia are fine, hair-like structures found on the surface of cells. They move rhythmically to move fluids across the cell surface or to propel the cell itself. are hairs that grow through the inside of the eyelid and directly contact the cornea, which can cause significant irritation. Trichiasis occurs when normal eyelashes or facial hairs grow toward the eye and irritate the cornea. These conditions are often genetic but can also result from physical traumaA trauma refers to a physical injury or damage caused by external force. Traumas can range from simple cuts to severe multiple injuries..

Symptoms include tearing, rubbing the eye, and corneal inflammation. DiagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. is made by a thorough eye examination with special instruments. Treatment options range from eye ointments for relief to surgical procedures to remove the abnormal eyelashes. The prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. is generally good but may require regular check-ups, especially in genetically predisposed breeds.

PreventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. is difficult because the causes are often genetic, but responsible breeding practices can reduce the risk. Research focuses on genetic studies and the development of minimally invasiveInvasive describes medical procedures or pathogens that enter the body or penetrate tissue. In medicine, invasive procedures can range from minimally invasive techniques to open surgery. treatment methods such as laser technology. It is also being investigated whether environmental factors increase the risk. Future breakthroughs in geneticsGenetics is the science of genes, heredity, and the variation of organisms. It studies how genetic information is passed from generation to generation and how it influences the development, appearance, and behavior of living things. and regenerative medicine could offer new treatment and preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. options.

Causes

Distichiasis is a condition in which extra eyelashes grow from the meibomian glands in the eyelid. These extra hairs can irritate the eye because they grow toward the cornea. Certain dog breeds, such as English Bulldogs, Cocker Spaniels, and Golden Retrievers, are often genetically predisposed to this condition.

Ectopic ciliaCilia are fine, hair-like structures found on the surface of cells. They move rhythmically to move fluids across the cell surface or to propel the cell itself. refer to hairs that grow through the inside of the eyelid and can directly contact the cornea. These hairs are often harder and stiffer than normal eyelashes and can cause significant irritation and damage to the cornea.

Trichiasis occurs when normal eyelashes or facial hairs grow toward the eye, which can be caused by an anatomical problem or injury. These hairs can also irritate the cornea and cause discomfort.

The causes of these conditions are often genetic, although they can also occur due to physical traumaA trauma refers to a physical injury or damage caused by external force. Traumas can range from simple cuts to severe multiple injuries. or chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. irritation that leads to misalignment of the eyelids.

Symptoms

Very common symptoms:

Common symptoms:

Rare symptoms:

Dogs with distichiasis, ectopic ciliaCilia are fine, hair-like structures found on the surface of cells. They move rhythmically to move fluids across the cell surface or to propel the cell itself., or trichiasis often show signs of eye irritation, such as frequent blinking or squinting, rubbing the eye with their paws or on the ground, and may tear excessively. These symptoms may be due to the irritation and pain caused by the abnormal eyelashes or hairs.

In severe cases, ulcers can form on the cornea, which can lead to significant pain and potential vision loss. Conjunctival hyperemiaHyperemia refers to an increased blood volume in a body area, often as a reaction to inflammation or as a result of improved blood circulation. It can lead to redness and a feeling of warmth in the affected area. and the formation of mucus or pus are also common symptoms.

Dogs may also show increased sensitivity to light and may experience decreased activity as they feel uncomfortable.

Diagnosis

The diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. of distichiasis, ectopic ciliaCilia are fine, hair-like structures found on the surface of cells. They move rhythmically to move fluids across the cell surface or to propel the cell itself., or trichiasis is usually made through a thorough eye examination. The veterinarian uses special instruments such as an ophthalmoscope to examine the eye thoroughly and identify the abnormal eyelashes or hairs.

A Schirmer tear test can be performed to check tear production, while a fluorescein test is used to identify corneal ulcers by placing a special dye solution in the eye that adheres to damaged areas.

In addition, a slit-lamp examination can be performed to assess the various layers of the eye and determine the extent of irritation or damage.

Therapy

Treatment for distichiasis, ectopic ciliaCilia are fine, hair-like structures found on the surface of cells. They move rhythmically to move fluids across the cell surface or to propel the cell itself., and trichiasis depends on the severity of the condition. In minor cases, regular monitoring and the application of eye ointments or drops to relieve symptoms may be sufficient.

In more severe cases, surgery may be required to remove the abnormal eyelashes or hairs. This can be done by electro-surgical epilation, cryotherapy, or surgical resection. Each method has its advantages and disadvantages, and the veterinarian will choose the best method based on the individual needs of the dog.

Postoperatively, treatment with antibiotics and anti-inflammatory drugsAnti-inflammatory drugs are medications that reduce inflammation. They can be divided into nonsteroidal anti-inflammatory drugs (NSAIDs) and corticosteroids and are used in dogs and cats to reduce Inflammatory conditions and Pain. is usually recommended to prevent infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. and promote recovery.

Prognosis and follow-up care

The prognosis for dogs with distichiasis, ectopic ciliaCilia are fine, hair-like structures found on the surface of cells. They move rhythmically to move fluids across the cell surface or to propel the cell itself., or trichiasis is generally good, especially if the condition is diagnosed and treated early. Most dogs recover completely after appropriate treatment and lead a normal life.

However, there is a possibility of recurrence, especially in genetically predisposed breeds. Regular check-ups and, if necessary, repeated treatments may be required to maintain the health of the eyes.

Prevention

Since these conditions are often genetic, preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. is difficult. However, responsible breeding practices that exclude the selectionSelection refers to the process of natural or artificial selection of specific individuals for reproduction, based on desired genetic traits. In breeding, this is applied to promote specific characteristics in dogs and cats. of breeding animals with known eyelash growth disorders can reduce the risk in future generations.

Regular eye examinations by a veterinarian can help detect and treat the condition early before it leads to serious problems. Caring for the dog’s eyes, including cleaning and checking for unusual hair growth, can also be helpful.

Outlook on current research

Research on distichiasis, ectopic ciliaCilia are fine, hair-like structures found on the surface of cells. They move rhythmically to move fluids across the cell surface or to propel the cell itself., and trichiasis in dogs has intensified in recent years, as these conditions not only affect the well-being of the animals but can also significantly reduce their quality of life. Scientists are focusing on genetic studies to identify the hereditary factors that lead to these malformations. It is believed that certain breeds have a genetic predispositionA predisposition is an innate inclination or susceptibility of an organism to certain diseases or conditions. In dogs and cats, there may be a genetic predisposition to certain conditions such as hip dysplasia or certain heart diseases., suggesting that genetic selectionSelection refers to the process of natural or artificial selection of specific individuals for reproduction, based on desired genetic traits. In breeding, this is applied to promote specific characteristics in dogs and cats. could play a role in breeding to reduce the incidenceIncidence refers to the number of new cases of a disease or condition that occur within a specific time period in a specific population group. It provides information about the risk of contracting the disease. of these conditions.

Another research focus is on the development of minimally invasiveInvasive describes medical procedures or pathogens that enter the body or penetrate tissue. In medicine, invasive procedures can range from minimally invasive techniques to open surgery. treatment methods. Traditionally, surgical procedures have been performed to correct the problem, but these can be risky and expensive. Current studies are investigating the use of laser technology and cryotherapy to safely and effectively remove unwanted eyelashes. InitialInitial means beginning or at the start. In medicine, it can refer to the first symptoms of a disease or the first phase of a treatment process. results are promising, with laser technology being particularly effective in permanently removing hair roots.

It is also being investigated whether environmental factors could play a role. Researchers are trying to find out whether elements such as diet, environmental pollution, or lifestyle factors can increase the risk of developing these conditions. These studies are still in an early stage but could enable new preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. strategies in the long term.

An interesting development is the study of stem cells and regenerative medicine in the treatment of eye diseases. Although research in this area is still in its infancy, there is evidence that stem cells could potentially be used to repair or regenerate damaged tissue, potentially offering a long-term solution for dogs with severe cases of distichiasis, ectopic ciliaCilia are fine, hair-like structures found on the surface of cells. They move rhythmically to move fluids across the cell surface or to propel the cell itself., and trichiasis.

In summary, research in this field is dynamic and constantly evolving. There is hope that future breakthroughs in geneticsGenetics is the science of genes, heredity, and the variation of organisms. It studies how genetic information is passed from generation to generation and how it influences the development, appearance, and behavior of living things., minimally invasiveInvasive describes medical procedures or pathogens that enter the body or penetrate tissue. In medicine, invasive procedures can range from minimally invasive techniques to open surgery. surgery, and regenerative medicine will offer new treatment and preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. options. Collaboration between veterinarians, geneticists, and eye researchers is crucial to finding a comprehensive solution to these widespread eye conditions in dogs.

Frequently asked questions (FAQs)

What is distichiasis in dogs? Distichiasis is a condition in which extra eyelashes grow from the meibomian glands on the edge of the eyelids. These extra eyelashes can irritate the surface of the eye and lead to various eye problems, including redness of the eyes, tearing, and in severe cases, ulcers on the cornea.
What are ectopic ciliaCilia are fine, hair-like structures found on the surface of cells. They move rhythmically to move fluids across the cell surface or to propel the cell itself.? Ectopic ciliaCilia are fine, hair-like structures found on the surface of cells. They move rhythmically to move fluids across the cell surface or to propel the cell itself. are eyelashes that grow out of an abnormal position within the eyelid. These cilia can point directly at the cornea of the eye, causing significant irritation and damage. They are often more difficult to detect than normal eyelashes because they are located inside the eyelids.
How does trichiasis differ from distichiasis? In trichiasis, the eyelashes grow in the wrong direction and rub against the surface of the eye, while in distichiasis, additional eyelashes appear in atypical locations. Both conditions can cause eye irritation, but the treatment methods may differ depending on the severity of the symptoms.
What symptoms indicate these conditions? Symptoms include frequent blinking, increased tearing, redness of the eyes, sensitivity to light, and in severe cases, corneal ulcers. Dogs may also try to constantly rub the eye, which can cause further damage.
Can all dogs be affected by these conditions? Yes, theoretically all dogs can be affected, but certain breeds have a higher predispositionA predisposition is an innate inclination or susceptibility of an organism to certain diseases or conditions. In dogs and cats, there may be a genetic predisposition to certain conditions such as hip dysplasia or certain heart diseases.. These include breeds such as Cocker Spaniels, Bulldogs, and Retrievers. The genetic component plays a significant role in a dog’s susceptibility.
How are these malformations diagnosed? The diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. is made by a thorough ophthalmological examination by a veterinarian. The veterinarian may use special instruments to look closely at the eyelids and the surface of the eye to determine if there are any extra or misdirected eyelashes.
What treatment options are there? Treatment options include manual removal of the eyelashes, surgical procedures for permanent removal or redirection of the eyelashes, and in some cases the use of laser or cryotherapy. The choice of treatment depends on the severity of the condition and the individual situation of the dog.
Can the condition lead to long-term damage? Yes, if left untreated, these conditions can lead to serious damage to the surface of the eye, including corneal ulcers and, in extreme cases, blindness. Early detection and treatment are crucial to avoid such complications.
Is a genetic test useful? A genetic test can be useful, especially in breeding animals or breeds with a known predispositionA predisposition is an innate inclination or susceptibility of an organism to certain diseases or conditions. In dogs and cats, there may be a genetic predisposition to certain conditions such as hip dysplasia or certain heart diseases.. Genetic tests can identify carriers, which can help with breeding planning to reduce the risk of the disease in future generations.
Can these conditions be prevented? While there is no absolute preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring., regular ophthalmological examinations can help detect problems early. In genetically predisposed breeds, careful breeding selectionSelection refers to the process of natural or artificial selection of specific individuals for reproduction, based on desired genetic traits. In breeding, this is applied to promote specific characteristics in dogs and cats. can help reduce the incidenceIncidence refers to the number of new cases of a disease or condition that occur within a specific time period in a specific population group. It provides information about the risk of contracting the disease.. A healthy diet and care can also help support overall eye health.