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Episcleritis (Redness of the Eyeball) in Dogs

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

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Episcleritis is an inflammatory condition of the outer layer of the eyeball (episclera) in dogs, leading to redness and swelling of the affected eye. This condition is generally not painful but can cause significant discomfort for the dog.

Can Occur with the Following Diseases:

Basics and possible causes

The episclera is the thin, outer layer of connective tissue of the eyeball, located directly beneath the conjunctiva. Its main function is to protect the eye and support the scleraThe sclera is the white outer layer of the eyeball that gives the eye shape and stability and protects it from injury. It transitions into the clear cornea at the front., the white of the eye. Inflammation of the episclera can be triggered by various factors, including immunological reactions, infections, or injuries.

One of the most common causes of episcleritis is an autoimmune reaction, where the dog’s immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body. attacks its own cells. This reaction can be influenced by genetic predispositions and often occurs in certain dog breeds such as Collies, Cocker Spaniels, and Boxers. In addition, environmental factors such as allergens or pollution can promote the development of the disease.

Infections caused by bacteriaBacteria are microscopic, single-celled organisms that exist in almost every environment on Earth. Some types of bacteria are beneficial or even essential to life, while others can cause disease., viruses, or fungi are another possible cause of episcleritis. These microorganisms can directly penetrate the episclera and cause inflammation there. Systemic infections affecting the entire body can also affect the eye and triggerA trigger is a stimulus that elicits a specific reaction or state. In veterinary medicine, this can refer to emotional responses, such as fear or aggression, or medical conditions, such as seizures in dogs and cats. episcleritis.

Injuries or traumaA trauma refers to a physical injury or damage caused by external force. Traumas can range from simple cuts to severe multiple injuries. to the eye can also lead to inflammation of the episclera. These can be caused by foreign objects, scratches, or accidents. In some cases, increased light sensitivity or excessive sun exposureExposure refers to the Contact with or subjection to certain substances, environmental factors, or pathogens. In veterinary medicine, this can include Contact with toxins, allergens, or infectious agents that can cause health problems in dogs and cats. can also promote the development of the disease.

Other less common causes may include tumors or growths in the area of the eye that put pressure on the episclera, causing inflammation. MetabolicMetabolic refers to metabolism, i.e. the entirety of chemical processes that take place in a living organism to enable life processes. Metabolic disorders can cause a variety of Diseases in Dogs and cats. disorders or hormonal imbalances could also play a role, but are less well documented.

Typical accompanying symptoms

Redness of the eyeball: The outer layer of the eye appears reddened, which is due to an increased blood supply due to the inflammation.
Swelling: The episclera may appear swollen, which makes the eye appear larger or bulging.
Tear flow: Increased tear flow may occur to cleanse the eye and mitigate the inflammation.
Slight light sensitivity: The dog may be sensitive to light, especially in bright sunlight.
Itching or discomfort: The dog may try to rub or scratch the affected eye to relieve the discomfort.
No or little pain: Unlike other eye diseases, episcleritis is usually not painful, which distinguishes it from other conditions.

When to visit the vet?

A visit to the veterinarian is necessary if the redness of the eye persists or worsens for more than a few days. Also, if the dog shows signs of discomfort, such as frequent blinking, rubbing the eye, or decreased activity, a veterinarian should be consulted immediately.

If the dog shows other symptoms such as fever, loss of appetite, or lethargy, these may indicate a systemic disease that also needs to be treated. These symptoms require immediate veterinary examination to initiate appropriate treatment.

A sudden loss of vision or the appearance of a cloudy or opaque eye may indicate more serious eye diseases that require rapid intervention. Likewise, the appearance of blood in the eye or persistentPersistent means lasting or continuing for an extended period. In veterinary medicine, it can refer to chronic diseases or symptoms that do not subside. swelling that does not subside should be considered an emergency.

Symptom recognition for animal owners and veterinary diagnostic procedures

It is important for the pet owner to recognize the symptoms of episcleritis early. Regular monitoring of the dog’s eyes can help to notice changes in time. Look for signs such as redness, swelling, or increased tear flow. The dog’s behavior, such as frequent blinking or rubbing of the eyes, can also indicate a disease.

The veterinarian will perform a thorough examination of the dog’s eyes to confirm the diagnosis. This includes observing the eyes with a special lamp to assess the structure and health of the episclera. The veterinarian may also perform a fluorescein examination to identify possible injuries or ulcers on the cornea.

In addition, blood tests can be performed to rule out other underlying conditions that could lead to episcleritis. If an infectiousInfectious describes the ability of a pathogen to be transmitted from one individual to another and trigger an infection. It also refers to diseases caused by such pathogens. cause is suspected, the veterinarian may take a sample of the tear fluid or conjunctiva and have it examined in the laboratory for bacteriaBacteria are microscopic, single-celled organisms that exist in almost every environment on Earth. Some types of bacteria are beneficial or even essential to life, while others can cause disease., viruses, or fungi.

What can pet owners do and professional therapy options

At home, pet owners can take some measures to relieve the symptoms of episcleritis. It is important to prevent the dog from rubbing its eyes, as this could worsen the inflammation. An Elizabethan collar can help prevent rubbing.

The use of artificial tears or special eye drops recommended by the veterinarian can help to moisten the eye and regulate tear flow. These drops should be used regularly to keep the eye clean and remove possible irritants.

It is important to keep the dog in a quiet and relaxed environment to avoid stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being., which could worsen the symptoms. Avoid walks in strong sunlight or windy weather to protect the eye from further irritation.

Although home remedies can be helpful, the treatment of episcleritis should always be under veterinary supervision. The veterinarian can prescribe medications that specifically target the cause of the inflammation, such as 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. or antibiotics for bacterial infections.

Outlook on current research

Research on episcleritis in dogs focuses on understanding the immunological mechanisms that lead to this inflammatory condition. Scientists are particularly investigating the role of immune cellsImmune cells are specialized cells of the immune system that help to identify and fight pathogens and foreign substances. These include leukocytes such as lymphocytes (T cells and B cells), macrophages, and dendritic cells. and inflammatory mediators in the development of episcleritis. These investigations are crucial to developing better therapeutic approaches that aim to control the inflammation without suppressing the dog’s immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body. as a whole.

Another important area of research is the 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. to episcleritis. Some studies suggest that certain dog breeds are more susceptible to this eye disease, which may indicate genetic factors. Research in this area aims to identify genetic markers that could enable early 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. and possibly even preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. of the disease.

In addition, the effectiveness of new treatment approaches is being investigated, including the use of topicalTopical refers to the direct application of medications or treatments to the skin or mucous membranes for a local effect, without being absorbed into the body. and systemic immunomodulators. These drugs could allow targeted treatment of the inflammation by targeting specific components of the immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body. that play a role in the development of episcleritis. Clinical trials are underway to evaluate the safety and efficacy of these new therapies in dogs.

Researchers are also investigating alternative treatment methods, such as the use of herbal preparations and dietary supplements that may have anti-inflammatory properties. These approaches could be used as complementary therapies to alleviate the symptoms of episcleritis, especially in dogs who do not respond well to or tolerate conventional medications.

Another focus is on improving diagnostic techniques for episcleritis. Currently, veterinarians rely on clinical examinations and the process of exclusion to diagnose this condition. Innovative imaging techniques and laboratory tests could improve the accuracy and speed of 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. and allow earlier intervention, which could positively influence the course of the disease.

An important aspect of the research is the investigation of environmental triggers that can worsen or triggerA trigger is a stimulus that elicits a specific reaction or state. In veterinary medicine, this can refer to emotional responses, such as fear or aggression, or medical conditions, such as seizures in dogs and cats. the disease. These studies could help develop preventive measures that minimize the risk of recurrence of episcleritis in affected dogs. This includes identifying allergens or other environmental factors that promote inflammatory reactions in the eye.

Collaboration between veterinarians, immunologists, and geneticists is crucial to unraveling the complex interactions in the development of episcleritis. Through interdisciplinary research approaches, scientists hope to develop more comprehensive and personalized treatment strategies that not only alleviate the symptoms but also address the underlying causes of the disease.

Research into the role of the microbiota in connection with ocular inflammation such as episcleritis in dogs is also ongoing. It is suspected that the microbial balance on the eye surface may play a role in triggering or maintaining inflammation. Future studies could reveal how probiotic treatments to stabilize the microbiota could contribute to controlling the disease.

Finally, the long-term follow-up of dogs with episcleritis is being investigated to understand how the disease develops over time and what factors contribute to relapses. These findings could provide important clues as to how to improve the quality of life of affected dogs and slow the progressionProgression refers to the advancement or worsening of a disease over time. It describes an increase in the severity or extent of the disease symptoms. of the disease.

Frequently asked questions

What is Episcleritis? Episcleritis is an inflammatory condition of the connective tissue between the scleraThe sclera is the white outer layer of the eyeball that gives the eye shape and stability and protects it from injury. It transitions into the clear cornea at the front. (white of the eye) and the conjunctiva of the eye. It leads to redness of the eyeball and sometimes to mild pain or irritation.
What symptoms are typical of episcleritis in dogs? Typical symptoms include a noticeable redness of the eyeball, tear flow, eye swelling, and occasional blinking or squinting. In some cases, the dog may also show signs of discomfort or pain, such as rubbing the eye with its paw.
What causes the redness of the eyeball in episcleritis? The redness is caused by inflammation of the blood vessels in the area of the episclera. This inflammation can be triggered by immune reactions, infections, or other underlying conditions.
Is episcleritis in dogs a serious condition? Episcleritis is usually a benignBenign refers to a non-invasive, non-serious condition that is not life-threatening. In medicine, the term is often used to describe benign tumors that do not metastasize, meaning they do not form secondary tumors. condition that often heals spontaneously. Nevertheless, it should be examined by a veterinarian to rule out other more serious eye diseases and to take appropriate treatment measures.
How is episcleritis 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 usually made by a thorough eye examination by the veterinarian, who assesses the symptoms and the course of the disease. In some cases, additional tests may be necessary to rule out other causes of the eye disease.
What treatment options are available for episcleritis in dogs? Treatment may include anti-inflammatory eye drops or ointments that help reduce inflammation. In more severe cases, systemic medications may be necessary. The exact treatment depends on the severity of the disease and the individual health condition of the dog.
Can episcleritis in dogs heal on its own? Yes, in many cases, episcleritis heals on its own. However, veterinary monitoring is important to ensure that no complications occur and to ensure appropriate treatment.
Can episcleritis in dogs recur? Yes, there is a possibility of relapse. Therefore, regular veterinary check-ups are important to monitor the condition of the eye and initiate renewed treatment if necessary.
Are there home remedies for treating episcleritis in dogs? While some home remedies such as cold compresses can help relieve the symptoms, they should never replace professional veterinary treatment. It is important that a veterinarian makes 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. and recommends the appropriate treatment.
How can I prevent my dog from getting episcleritis? Since the exact causes of episcleritis are often unclear, there are no specific preventive measures. However, general care of the eyes and regular veterinary check-ups can help minimize the risk of eye problems and detect them early if they occur.