Home » Diseases » In dogs » Congenital Cataract (Congenital Lens Opacity, Cataract)

Congenital Cataract (Congenital Lens Opacity, Cataract) in Dogs

Occurrence: very rare
Location of illness: Head/Neck

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

CongenitalCongenital means "present from birth" and refers to characteristics or conditions that are already present at birth. This can include genetic disorders, developmental anomalies, or infections transmitted by the mother. cataract in dogs is a congenitalCongenital means "present from birth" and refers to characteristics or conditions that are already present at birth. This can include genetic disorders, developmental anomalies, or infections transmitted by the mother. clouding of the lens of the eye that can impair vision. It occurs directly at birth or in the first weeks of life and can be unilateral or bilateral.

The most important facts at a glance

Congenital cataracts in dogs are opacities of the lens of the eye that are present from birth and lead to visual disturbances. These opacities are caused by changes in the structure of the lens proteins and are often genetic. Certain dog breeds such as the Boston Terrier and the Golden Retriever are particularly susceptible due to breed-specific genetic mutations. Prenatal infections and nutritional deficiencies in the mother dog can also contribute to the development.

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 an ophthalmological examination, possibly supplemented by genetic tests. Treatment usually consists of surgical removal of the cloudy lens, with the decision to operate depending on factors such as the dog’s age and health. Without treatment, the disease can lead to blindness, with the dog then relying on other senses. PreventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. focuses on avoiding breeding animals with 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. and ensuring a healthy pregnancy.

Research aims to better understand the genetic causes and develop alternative, less 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. treatments. New diagnostic technologies and studies on dietary influences could improve the management of the disease in the future. Regular veterinary check-ups are crucial to take early action.

Causes

The lens of the eye is a clear, flexible body that bundles light and focuses it on 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.. A cataract occurs when this lens becomes cloudy and no longer allows light to pass through correctly, leading to visual disturbances. The clouding can be caused by changes in the structure or composition of the proteins in the lens. In congenitalCongenital means "present from birth" and refers to characteristics or conditions that are already present at birth. This can include genetic disorders, developmental anomalies, or infections transmitted by the mother. cataracts, these changes are present from birth.

Genetic factors play a significant role in the development of congenitalCongenital means "present from birth" and refers to characteristics or conditions that are already present at birth. This can include genetic disorders, developmental anomalies, or infections transmitted by the mother. cataracts. Different dog breeds show a different 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 this disease, which indicates breed-related genetic mutations. For example, breeds such as the Boston Terrier, the French Bulldog, and the Golden Retriever are more frequently affected.

In addition to genetic causes, prenatal infections or nutritional deficiencies in the mother dog can also contribute to the development of cataracts in the puppy. Infections such as canineCanine refers to anything related to dogs. The term is used to describe characteristics, diseases, or specific aspects that specifically affect dogs. herpesvirus and toxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. influences during pregnancy can also play a role.

Symptoms

Very common symptoms:

Common symptoms:

Vision Impaired

The symptoms of congenitalCongenital means “present from birth” and refers to characteristics or conditions that are already present at birth. This can include genetic disorders, developmental anomalies, or infections transmitted by the mother. cataract can vary from very mild to severe, depending on the size and location of the clouding. An early sign may be a change in eye color, which is perceived as milky white or gray. This change is especially visible in direct light.

A puppy with this condition may show signs of visual disturbances, such as difficulty navigating new environments, increased startle response / jumpiness, or bumping into objects. In severe cases, complete blindness can occur.

Since the cataract may be present at a very young age, the symptoms can be subtle and gradually worsen as the dog grows. It is important to pay attention to behavioral changes that may indicate visual disturbances.

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 a congenitalCongenital means "present from birth" and refers to characteristics or conditions that are already present at birth. This can include genetic disorders, developmental anomalies, or infections transmitted by the mother. cataract is usually made by a thorough ophthalmological examination. The veterinarian will use slit-lamp microscopy to examine the lens of the eye in detail and assess the clouding.

In addition, special tests such as electroretinographyElectroretinography is a diagnostic test that measures the electrical activity of the retina of the eye. It is used for the diagnosis of retinal diseases. can be performed to check the function 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.. This is important to rule out other eye diseases that can cause similar symptoms to a cataract.

Genetic tests can also be helpful in identifying the underlying genetic cause of the cataract, especially in breeds that are predisposed to this disease. When performing such tests, a blood sample from the dog can be sent to a specialized laboratory for analysis.

Therapy

The primary treatment method for congenital cataracts is surgical removal of the cloudy lens, a procedure known as phacoemulsification. In this procedure, the lens is removed with 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. fragmentation and replaced with an artificial intraocular lens.

The decision to have surgery depends on several factors, including the age of the dog, the severity of the cataract, and the animal’s general health. In very young puppies, it may be necessary to wait for the surgery until they are old enough to tolerate the procedure.

In cases where surgery is not possible or desired, the management of the disease can be symptomatic. This includes the use of eye drops to reduce inflammatory conditions, as well as adapting the environment to make everyday life easier for the dog.

Prognosis and follow-up care

The prognosis for dogs with congenitalCongenital means "present from birth" and refers to characteristics or conditions that are already present at birth. This can include genetic disorders, developmental anomalies, or infections transmitted by the mother. cataract varies greatly, depending on the severity of the disease and the treatment strategy chosen. Dogs who undergo successful cataract surgery can often experience a significant improvement in their vision and lead a normal life.

Without surgical intervention, however, the cataract can progress and lead to complete blindness. In such cases, dogs rely on their other senses and may need additional support and adjustments in their environment.

It is important to note that even after successful surgery, potential complications such as inflammatory conditions or lens luxations can occur. Regular follow-up examinations are therefore crucial for the long-term well-being of the dog.

Prevention

Since genetic factors are a major cause of congenitalCongenital means "present from birth" and refers to characteristics or conditions that are already present at birth. This can include genetic disorders, developmental anomalies, or infections transmitted by the mother. cataracts, preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. is primarily aimed at avoiding mating dogs with a known 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.. Breeders should use genetic tests to identify carriers of cataract-associated genes and exclude these animals from breeding.

A healthy diet and careful health monitoring of the pregnant bitch can also contribute to preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring.. It is important that pregnant bitches are protected from potentially harmful infections and toxins that could affect the development of the puppies.

Although not all cases of congenitalCongenital means "present from birth" and refers to characteristics or conditions that are already present at birth. This can include genetic disorders, developmental anomalies, or infections transmitted by the mother. cataract can be prevented, responsible breeding practices and good prenatal care help minimize the risk of this disease. Regular veterinary check-ups are crucial to detect early signs of a cataract and take appropriate measures.

Outlook on current research

Research on congenitalCongenital means "present from birth" and refers to characteristics or conditions that are already present at birth. This can include genetic disorders, developmental anomalies, or infections transmitted by the mother. cataract in dogs has made significant progress in recent years. Scientists are focusing on identifying the genetic causes of this disease, as many cases of congenitalCongenital means "present from birth" and refers to characteristics or conditions that are already present at birth. This can include genetic disorders, developmental anomalies, or infections transmitted by the mother. cataract have a genetic component. By studying specific genetic markers, researchers can better understand which breeds or individuals are at higher risk of developing this disease. This not only allows for earlier 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., but also for the development of breeding programs aimed at reducing the occurrence of this disease.

Another exciting area of research is the development of non-invasive diagnostic techniques. Traditionally, 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 a congenitalCongenital means "present from birth" and refers to characteristics or conditions that are already present at birth. This can include genetic disorders, developmental anomalies, or infections transmitted by the mother. cataract requires a thorough examination by a veterinarian, often using special equipment such as a slit lampA slit lamp is a special microscope used in veterinary ophthalmology to examine the anterior structures of the eye in detail, including the cornea, the iris, and the lens. Examination with a slit lamp can aid in the diagnosis of eye diseases in dogs and cats.. However, new advances in imaging technology could lead to simpler and faster diagnostic methods becoming available. These technologies could make it possible to detect cataracts at an earlier stage, which 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 treatment options.

Therapeutic research focuses on developing new treatment methods that go beyond the traditional surgical removal of the lens. While cataract surgery is currently the most effective treatment, researchers are striving to explore alternative therapies that are less 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.. These include approaches such as drug treatment to 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 or the use of laser 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. to eliminate lens opacities. Although these approaches are still in the early stages of research, there is hope that they could play a role in the treatment of congenitalCongenital means "present from birth" and refers to characteristics or conditions that are already present at birth. This can include genetic disorders, developmental anomalies, or infections transmitted by the mother. cataracts in the future.

At the molecular level, researchers are investigating the mechanisms that lead to clouding of the lens. Lens clouding is often caused by an accumulation of misfolded proteins or cell debris. Scientists are investigating how these processes can be stopped or reversed to maintain or restore the clarity of the lens. This research could be important not only for dogs, but also for other mammals, including humans.

In addition, efforts are being made to improve the quality of life of dogs with congenitalCongenital means "present from birth" and refers to characteristics or conditions that are already present at birth. This can include genetic disorders, developmental anomalies, or infections transmitted by the mother. cataracts. Behavioral researchers are working to develop strategies that help affected dogs navigate their environment better. This can be achieved through special training programs or adjustments in the home environment that help dogs lead a normal life despite their visual impairment.

Finally, the role of nutrition in the development and management of cataracts is also being investigated. Some studies suggest that certain nutrients, such as omega-3 fatty acids and antioxidants, may have a protective effect on the lens. These findings could lead to dietary recommendations that reduce the risk of developing cataracts or slow their 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..

Frequently asked questions (FAQs)

What is a congenitalCongenital means "present from birth" and refers to characteristics or conditions that are already present at birth. This can include genetic disorders, developmental anomalies, or infections transmitted by the mother. cataract in dogs? A congenitalCongenital means "present from birth" and refers to characteristics or conditions that are already present at birth. This can include genetic disorders, developmental anomalies, or infections transmitted by the mother. cataract is a congenitalCongenital means "present from birth" and refers to characteristics or conditions that are already present at birth. This can include genetic disorders, developmental anomalies, or infections transmitted by the mother. clouding of the lens in a dog’s eye. This clouding can impair vision and, if left untreated, lead to blindness.
What are the causes of congenital cataracts in dogs? The causes can be genetic, meaning that the clouding of the lens is present at birth. Other factors, such as infections or toxicToxic means "poisonous" and refers to substances that can have harmful effects on the body, including damage to organs, cells, or disruption of metabolic processes. influences during pregnancy, can also play a role.
How is a congenitalCongenital means "present from birth" and refers to characteristics or conditions that are already present at birth. This can include genetic disorders, developmental anomalies, or infections transmitted by the mother. cataract diagnosed in dogs? A veterinarian can diagnose a congenitalCongenital means "present from birth" and refers to characteristics or conditions that are already present at birth. This can include genetic disorders, developmental anomalies, or infections transmitted by the mother. cataract during an eye examination. A slit lampA slit lamp is a special microscope used in veterinary ophthalmology to examine the anterior structures of the eye in detail, including the cornea, the iris, and the lens. Examination with a slit lamp can aid in the diagnosis of eye diseases in dogs and cats. is often used to examine the structure of the lens.
What treatment options are available for congenitalCongenital means "present from birth" and refers to characteristics or conditions that are already present at birth. This can include genetic disorders, developmental anomalies, or infections transmitted by the mother. cataracts in dogs? The most common treatment is surgical removal of the cloudy lens, followed by implantation of an artificial lens. In some cases, drug 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. may also be considered to 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.
Can congenitalCongenital means "present from birth" and refers to characteristics or conditions that are already present at birth. This can include genetic disorders, developmental anomalies, or infections transmitted by the mother. cataracts be prevented in dogs? Since many congenitalCongenital means "present from birth" and refers to characteristics or conditions that are already present at birth. This can include genetic disorders, developmental anomalies, or infections transmitted by the mother. cataracts are genetic, they cannot be completely prevented. However, targeted breeding programs can reduce the risk of affected parents passing the disease on to their offspring.
Which dog breeds are particularly susceptible to congenitalCongenital means "present from birth" and refers to characteristics or conditions that are already present at birth. This can include genetic disorders, developmental anomalies, or infections transmitted by the mother. cataracts? Some breeds, such as the Boston Terrier, Cocker Spaniel, and Siberian Husky, are more commonly affected by congenitalCongenital means "present from birth" and refers to characteristics or conditions that are already present at birth. This can include genetic disorders, developmental anomalies, or infections transmitted by the mother. cataracts. It is important that breeders and owners of these breeds pay attention to signs of the disease.
What symptoms indicate a congenitalCongenital means "present from birth" and refers to characteristics or conditions that are already present at birth. This can include genetic disorders, developmental anomalies, or infections transmitted by the mother. cataract in dogs? Symptoms include cloudy or milky eyes, difficulty seeing, especially in low light, and frequent stumbling over obstacles. Behavioral changes such as anxiety or nervousness can also occur.
Is surgery to remove cataracts in dogs risky? As with any surgery, there are risks, but cataract removal is a relatively common and safe procedure. An experienced veterinarian can minimize the risks and, in general, 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. after surgery is good.
How can I help my dog after cataract surgery? After the surgery, your dog needs plenty of rest and should not engage in strenuous activities. It is important to follow the veterinarian’s instructions for aftercare carefully, including administering medication and avoiding rubbing the eye.
Are there alternative therapies to surgery for congenitalCongenital means "present from birth" and refers to characteristics or conditions that are already present at birth. This can include genetic disorders, developmental anomalies, or infections transmitted by the mother. cataracts? While surgery is the most effective treatment, research is being conducted into alternative therapies such as medications and laser treatments. However, these are still in the development phase and are not currently widely used.