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Chorioretinitis (Inflammation of the Retina and Choroid of the Eye) in Dogs

Occurrence: rarer
Location of illness: Head/Neck

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

Chorioretinitis is an inflammatory condition that affects both the retinaThe retina is the light-sensitive layer at the back of the eye that captures visual information and transmits it to the brain via the optic nerve. Retinal diseases can lead to vision loss in dogs and cats. and the choroidThe choroid is a layer of the eye located between the retina and the white outer layer of the eye (sclera). It is rich in blood vessels and responsible for supplying the retina with nutrients and oxygen. of the eye. This inflammation can lead to impaired vision and is a serious condition in dogs that requires timely 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 treatment.

The most important facts at a glance

Chorioretinitis is an eye disease in dogs that affects the retinaThe retina is the light-sensitive layer at the back of the eye that captures visual information and transmits it to the brain via the optic nerve. Retinal diseases can lead to vision loss in dogs and cats. and choroidThe choroid is a layer of the eye located between the retina and the white outer layer of the eye (sclera). It is rich in blood vessels and responsible for supplying the retina with nutrients and oxygen. and can be triggered by infections, autoimmune reactions, or traumaA trauma refers to a physical injury or damage caused by external force. Traumas can range from simple cuts to severe multiple injuries.. 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. agents include 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, fungi, and parasites. Autoimmune diseasesAutoimmune diseases are conditions in which the immune system mistakenly attacks the body's own cells or tissues as if they were foreign substances. Examples in dogs and cats include autoimmune hemolytic anemia and systemic lupus erythematosus. can also cause inflammation when 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. attacks its own cells. Symptoms include impaired vision, increased tearing, and Rubbing the eye. 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 an ophthalmological examination and can be supplemented by blood tests and imaging procedures such as ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow. or MRI to determine the cause.

Treatment is directed at the underlying cause. Antibiotics, antiviral, antifungalAntifungal means effective against fungal infections. Antifungal medications are used to treat infections caused by fungi by inhibiting their growth or reproduction, or by killing them., or antiparasitic drugs are used depending on the pathogenA pathogen is a microorganism or virus that can cause disease in its host. Pathogens include bacteria, viruses, fungi, and parasites.. ImmunosuppressiveImmunosuppressive agents are medications or substances that specifically suppress the activity of the immune system. They are used in dogs and cats to treat autoimmune diseases, allergies, and to prevent rejection reactions after transplants. drugs may be necessary for autoimmune diseasesAutoimmune diseases are conditions in which the immune system mistakenly attacks the body's own cells or tissues as if they were foreign substances. Examples in dogs and cats include autoimmune hemolytic anemia and systemic lupus erythematosus.. SupportiveSupportive refers to supportive treatments that aim to alleviate symptoms and improve quality of life without directly treating the underlying cause of the disease. measures such as pain relievers or special eye drops may also be necessary. 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. depends on the severity of the disease and the cause, with timely treatment improving vision. Preventive measures include vaccinations, good hygiene, and regular veterinary check-ups.

Research focuses on genetic predispositions, new diagnostic techniques, and innovative therapies such as stem cell therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions.. Advances in these areas could improve 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. and quality of life of affected dogs.

Causes

The dog’s eye consists of several layers, with the retinaThe retina is the light-sensitive layer at the back of the eye that captures visual information and transmits it to the brain via the optic nerve. Retinal diseases can lead to vision loss in dogs and cats. being the innermost layer that converts light into nerve impulses, which are then sent to the brain. The choroidThe choroid is a layer of the eye located between the retina and the white outer layer of the eye (sclera). It is rich in blood vessels and responsible for supplying the retina with nutrients and oxygen. lies directly beneath the retinaThe retina is the light-sensitive layer at the back of the eye that captures visual information and transmits it to the brain via the optic nerve. Retinal diseases can lead to vision loss in dogs and cats. and supplies it with blood and nutrients. Inflammation in these layers can be triggered by various factors, including infections, autoimmune diseasesAutoimmune diseases are conditions in which the immune system mistakenly attacks the body's own cells or tissues as if they were foreign substances. Examples in dogs and cats include autoimmune hemolytic anemia and systemic lupus erythematosus., or traumaA trauma refers to a physical injury or damage caused by external force. Traumas can range from simple cuts to severe multiple injuries..

Chorioretinitis can be caused by a variety of 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. agents. These include 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, fungi, and parasites. A common bacterial cause is leptospirosis, while viruses such as canineCanine refers to anything related to dogs. The term is used to describe characteristics, diseases, or specific aspects that specifically affect dogs. distemper virusA virus is a microscopic infectious particle that cannot reproduce on its own and must infect a host cell to produce new virus particles. Viruses can cause a variety of diseases in humans, animals, and plants. may also be involved. Fungal infections such as histoplasmosis and fungal species such as Cryptococcus are also known to be triggers in some regions. ParasiticParasitic refers to diseases or conditions caused by parasites. Parasitic infections can affect the digestive tract, skin, and other organ systems. infections such as toxoplasmosis can also play a role.

Autoimmune diseasesAutoimmune diseases are conditions in which the immune system mistakenly attacks the body's own cells or tissues as if they were foreign substances. Examples in dogs and cats include autoimmune hemolytic anemia and systemic lupus erythematosus. are another important cause. In such cases, 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. mistakenly attacks its own cells in the retinaThe retina is the light-sensitive layer at the back of the eye that captures visual information and transmits it to the brain via the optic nerve. Retinal diseases can lead to vision loss in dogs and cats. and choroidThe choroid is a layer of the eye located between the retina and the white outer layer of the eye (sclera). It is rich in blood vessels and responsible for supplying the retina with nutrients and oxygen., leading to inflammation. These conditions can be idiopathicIdiopathic refers to a condition or disease for which the cause is unknown. It is used when no clear external cause or underlying disease can be identified as an explanation for the symptoms., meaning the exact cause is unknown, or they can be related to systemic autoimmune diseasesAutoimmune diseases are conditions in which the immune system mistakenly attacks the body's own cells or tissues as if they were foreign substances. Examples in dogs and cats include autoimmune hemolytic anemia and systemic lupus erythematosus..

Traumatic causes such as injuries to the eye or surgical procedures can also cause inflammation of the retinaThe retina is the light-sensitive layer at the back of the eye that captures visual information and transmits it to the brain via the optic nerve. Retinal diseases can lead to vision loss in dogs and cats. and choroidThe choroid is a layer of the eye located between the retina and the white outer layer of the eye (sclera). It is rich in blood vessels and responsible for supplying the retina with nutrients and oxygen.. In addition, systemic diseases that lead to a general inflammatory response can affect the eyes 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. chorioretinitis.

Symptoms

Very common symptoms:

Common symptoms:

Rare symptoms:

Dogs with chorioretinitis often show changes in vision, ranging from mild to severe visual disturbances. Owners may notice that their dog bumps into objects or has difficulty navigating in familiar environments.

Other symptoms include Redness of the eyes and Swelling of the eye, excessive tearing, and sensitivity to light. In some cases, the affected eye may have an unusual appearance, such as a change in color or cloudiness caused by the inflammation.

Dogs may also show signs of discomfort or Pain, such as increased blinking or Rubbing the eye with their paw. These symptoms may vary depending on the severity of the inflammation and the underlying cause.

Diagnosis

Chorioretinitis is usually diagnosed by a thorough ophthalmological examination. The veterinarian will examine the eye with special instruments to identify changes in the retinaThe retina is the light-sensitive layer at the back of the eye that captures visual information and transmits it to the brain via the optic nerve. Retinal diseases can lead to vision loss in dogs and cats. and choroidThe choroid is a layer of the eye located between the retina and the white outer layer of the eye (sclera). It is rich in blood vessels and responsible for supplying the retina with nutrients and oxygen.. A slit-lamp examination and ophthalmoscopy are commonly used methods to obtain detailed images of the fundus.

In addition, blood tests and other diagnostic procedures may be necessary to determine the underlying cause of the inflammation. These tests can identify infections, autoimmune diseasesAutoimmune diseases are conditions in which the immune system mistakenly attacks the body's own cells or tissues as if they were foreign substances. Examples in dogs and cats include autoimmune hemolytic anemia and systemic lupus erythematosus., or other systemic diseases that may be contributing to chorioretinitis.

In some cases, an ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow. or magnetic resonance imaging (MRI)Magnetic resonance imaging is an imaging technique that uses strong magnetic fields and radio waves to create detailed images of the inside of the body. It is used in veterinary medicine to diagnose diseases of the brain, spine, and other organs. of the eye may be performed to obtain more detailed information about the condition of the retinaThe retina is the light-sensitive layer at the back of the eye that captures visual information and transmits it to the brain via the optic nerve. Retinal diseases can lead to vision loss in dogs and cats. and choroidThe choroid is a layer of the eye located between the retina and the white outer layer of the eye (sclera). It is rich in blood vessels and responsible for supplying the retina with nutrients and oxygen.. These imaging procedures can help confirm 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 develop the best treatment strategy.

Therapy

The treatment of chorioretinitis depends on the underlying cause of the inflammation. Antibiotics may be prescribed for bacterial infections, while antiviral or antifungalAntifungal means effective against fungal infections. Antifungal medications are used to treat infections caused by fungi by inhibiting their growth or reproduction, or by killing them. medications are used for viralViral refers to viruses and their effects on the organism. Viral infections in dogs and cats can range from harmless colds to severe, life-threatening diseases. or fungal causes. Antiparasitic agents are administered for parasiticParasitic refers to diseases or conditions caused by parasites. Parasitic infections can affect the digestive tract, skin, and other organ systems. infections.

If an autoimmune disease is the cause, immunosuppressiveImmunosuppressive agents are medications or substances that specifically suppress the activity of the immune system. They are used in dogs and cats to treat autoimmune diseases, allergies, and to prevent rejection reactions after transplants. drugs may be needed to control the inflammation and prevent 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. from continuing to attack its own cells. CorticosteroidsCorticosteroids are a class of steroid hormones that occur naturally in the body and can also be produced synthetically. They have anti-inflammatory and immunosuppressive properties and are used in veterinary medicine to treat a variety of conditions. are commonly used medications in such cases.

In some cases, supportiveSupportive refers to supportive treatments that aim to alleviate symptoms and improve quality of life without directly treating the underlying cause of the disease. measures may be necessary to ensure the dog’s well-being. These include pain relievers, special eye drops to relieve discomfort, and careful monitoring of the affected eye to avoid complications.

Prognosis and follow-up care

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. for dogs with chorioretinitis depends on the severity of the disease and the underlying cause. With timely 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 appropriate treatment, vision can improve and the inflammation can be successfully controlled.

However, in some cases, permanent damage to the retinaThe retina is the light-sensitive layer at the back of the eye that captures visual information and transmits it to the brain via the optic nerve. Retinal diseases can lead to vision loss in dogs and cats. and choroidThe choroid is a layer of the eye located between the retina and the white outer layer of the eye (sclera). It is rich in blood vessels and responsible for supplying the retina with nutrients and oxygen. can occur, which can lead to permanent visual disturbances. Regular follow-up examinations with the veterinarian are important to monitor the progress of treatment and make adjustments if necessary.

Prevention

PreventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. of chorioretinitis focuses on avoiding the underlying causes. This includes regular vaccinationVaccination is the process of administering a vaccine to develop immunity against a specific infectious disease. It is one of the most effective methods of prevention of infectious diseases. against 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. diseases such as distemper, which can trigger chorioretinitis.

Good hygiene and care of the dog, as well as regular veterinary check-ups, can help reduce the risk of infections and systemic diseases. A healthy diet and sufficient exercise support 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. and contribute to the dog’s general health.

In dogs with known autoimmune diseases, it is important to follow the treatment plans prescribed by the veterinarian closely to avoid flare-ups and protect the eyes from Inflammatory conditions.

For further information about chorioretinitis in dogs or specific scientific studies, you can check [this page](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC).

Outlook on current research

Chorioretinitis is a significant eye disease in dogs that affects the retina and the choroidThe choroid is a layer of the eye located between the retina and the white outer layer of the eye (sclera). It is rich in blood vessels and responsible for supplying the retina with nutrients and oxygen.. This condition can be triggered by a variety of causes, including infections, autoimmune reactions, and traumaA trauma refers to a physical injury or damage caused by external force. Traumas can range from simple cuts to severe multiple injuries.. Current research focuses on better understanding the specific mechanisms that lead to this complex disease. One focus is on identifying genetic predispositions that could make certain breeds more susceptible to chorioretinitis. Studies have shown that certain breeds, such as the Golden Retriever, have a higher 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., suggesting a genetic component.

Another area of research relates to the development of new diagnostic techniques. Advanced imaging techniques are currently being investigated that could allow veterinarians to make earlier and more accurate diagnoses. Imaging techniques such as Optical Coherence Tomography (OCT) provide detailed insights into the structure of the eye and help identify the specific changes in chorioretinitis. These new technologies could make it possible to detect subtle changes before they lead to visible symptoms.

Research on the therapeutic management of chorioretinitis is also an active area. Current treatment aims to address the underlying cause and reduce inflammation, often with the help of immunosuppressants or antibiotics, depending on the cause. Researchers are investigating new drugs and treatment methods that could be more targeted and have fewer side effects. These include biologically based therapies and the use of nanotechnology for more targeted drug delivery.

Another promising area of research is stem cell therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions.. 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. studies suggest that stem cells could help regenerate damaged tissue in the retinaThe retina is the light-sensitive layer at the back of the eye that captures visual information and transmits it to the brain via the optic nerve. Retinal diseases can lead to vision loss in dogs and cats. and choroidThe choroid is a layer of the eye located between the retina and the white outer layer of the eye (sclera). It is rich in blood vessels and responsible for supplying the retina with nutrients and oxygen.. However, this therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. option is still in an early stage of development and further research is needed to ensure its safety and effectiveness.

In summary, research on chorioretinitis in dogs aims to improve both diagnostic and therapeutic options. Advances in genetic research, imaging technology, and new treatment methods are helping to improve 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. for affected dogs and increase their quality of life. These developments offer hope that more accurate and effective treatment strategies will be available in the near future.

Frequently asked questions (FAQs)

What are the typical symptoms of chorioretinitis in dogs? Typical symptoms may include Visual disturbances, Redness of the eyes, tearing, sensitivity to light, and in severe cases, complete vision loss. Dogs may also show signs of Pain or discomfort by frequently Rubbing the eye or blinking.
How is chorioretinitis 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 a veterinarian or a specialized veterinary ophthalmologist. Imaging techniques such as ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow. or Optical Coherence Tomography (OCT) can also be used to visualize the retinaThe retina is the light-sensitive layer at the back of the eye that captures visual information and transmits it to the brain via the optic nerve. Retinal diseases can lead to vision loss in dogs and cats. and choroid in detail.
What causes chorioretinitis? Chorioretinitis can be triggered by various causes, including infections (bacterial, viralViral refers to viruses and their effects on the organism. Viral infections in dogs and cats can range from harmless colds to severe, life-threatening diseases., parasiticParasitic refers to diseases or conditions caused by parasites. Parasitic infections can affect the digestive tract, skin, and other organ systems.), autoimmune diseasesAutoimmune diseases are conditions in which the immune system mistakenly attacks the body's own cells or tissues as if they were foreign substances. Examples in dogs and cats include autoimmune hemolytic anemia and systemic lupus erythematosus., trauma, or systemic diseases such as diabetes. The exact cause is often crucial for the choice of treatment.
Is chorioretinitis curable in dogs? The cure of chorioretinitis depends on the underlying cause. A cure may be possible for some 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. causes, while for autoimmune causes the disease is often 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. and requires long-term treatment.
Which breeds are more susceptible to chorioretinitis? There is evidence that certain dog breeds, such as the Golden Retriever, Collie, or Siberian Husky, may be genetically predisposed to eye diseases including chorioretinitis. However, this is still the subject of ongoing research.
Can chorioretinitis be prevented? Complete preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. is difficult, especially if genetic factors play a role. However, 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 treatment of other systemic infections or diseases can reduce the risk. Regular veterinary examinations are important for early detection.
What treatment options are available for chorioretinitis? Treatment depends on the cause and may include the administration of antibiotics, antifungals, or antiviral medications. Immunosuppressants are often used for autoimmune causes to control inflammation.
What is 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. for dogs with chorioretinitis? 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. varies depending on the cause and severity of the disease. With 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 treatment, the prospect of preserving vision is better. However, 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. or severe cases can lead to permanent vision loss.
Are there any new developments in the treatment of chorioretinitis? Yes, there is ongoing research into new treatment methods, including the use of biological therapies and stem cell therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions.. However, these approaches are still being tested and are not currently widely available.
How can I help my dog with chorioretinitis? In addition to veterinary treatment, you can help your dog by creating a calm and stress-free environment, avoiding direct sunlight, and having regular check-ups with the veterinarian. A balanced diet can also contribute to general health and well-being.