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Aortic Stenosis (Narrowing of the Heart Valve at the Aortic Artery) in Dogs

Occurrence: rarer
Location of illness: Chest

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

Aortic stenosisAortic stenosis is a narrowing of the aortic valve that obstructs blood flow from the heart into the aorta. This can lead to increased strain on the heart and cause symptoms such as shortness of breath, dizziness, and chest pain. is a heart condition in dogs characterized by a narrowing of the aortic valve, which obstructs blood flow from the heart into the aorta.

The most important facts at a glance

Aortic stenosis in dogs is a narrowing of the aortic valve that makes it difficult for blood to flow from the heart into the aorta, straining the heart. This condition is usually genetic, with breeds such as Golden Retrievers, German Shepherds, Boxers, and Newfoundlands being particularly susceptible. The narrowing can also be caused by developmental disorders of the heart valves during the embryonic phase. Symptoms include respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. distress, reduced exercise tolerance, heart murmurs, dizziness, and in severe cases, loss of consciousness and cyanosisCyanosis refers to a bluish discoloration of the skin and mucous membranes, caused by an inadequate oxygen supply to the blood. It can be a sign of heart, lung, or blood diseases.. 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 through physical examinations, 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. and X-rays, and electrocardiograms. Treatment aims to relieve symptoms 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. In mild cases, regular monitoring is sufficient, while more severe cases may require medication or surgical procedures such as balloon valvuloplastyBalloon valvuloplasty is a medical procedure in which a narrowed heart valve is widened using a catheter equipped with a balloon at its end. The balloon is inserted into the narrowed valve and then inflated to open the narrowing.. 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 severity of the disease. While dogs with a mild form of the disease can often live a normal life, dogs with severe aortic stenosisAortic stenosis is a narrowing of the aortic valve that obstructs blood flow from the heart into the aorta. This can lead to increased strain on the heart and cause symptoms such as shortness of breath, dizziness, and chest pain. have a higher risk of heart failure. PreventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. is primarily possible through targeted breeding strategies to minimize genetic predispositions. Research focuses on the genetic causes and the improvement of diagnostic and treatment methods, including 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. surgical techniques and innovative therapeutic approaches such as stem cell research.

Causes

The aortic valve is one of the four heart valves that regulate blood flow in the heart. In aortic stenosisAortic stenosis is a narrowing of the aortic valve that obstructs blood flow from the heart into the aorta. This can lead to increased strain on the heart and cause symptoms such as shortness of breath, dizziness, and chest pain., the valve is narrowed, meaning the heart has to work harder to pump blood through the narrowed opening into the aorta. This can lead to heart overload and eventually cause heart failure.

The causes of aortic stenosisAortic stenosis is a narrowing of the aortic valve that obstructs blood flow from the heart into the aorta. This can lead to increased strain on the heart and cause symptoms such as shortness of breath, dizziness, and chest pain. in dogs are predominantly genetic. Certain breeds are predisposed, including the Golden Retriever, German Shepherd, Boxer, and Newfoundland. This 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. often leads to 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. form of the disease that can be diagnosed in young dogs.

Another factor that can contribute to aortic stenosisAortic stenosis is a narrowing of the aortic valve that obstructs blood flow from the heart into the aorta. This can lead to increased strain on the heart and cause symptoms such as shortness of breath, dizziness, and chest pain. is inadequate development of the heart valves during the embryonic phase. Such developmental disorders can lead to an abnormal structure of the valve, which impairs its proper function.

Symptoms

Very common symptoms:

Common symptoms:

Rare symptoms:

The symptoms of aortic stenosisAortic stenosis is a narrowing of the aortic valve that obstructs blood flow from the heart into the aorta. This can lead to increased strain on the heart and cause symptoms such as shortness of breath, dizziness, and chest pain. can vary depending on how severe the narrowing is. In mild cases, dogs may be asymptomaticAsymptomatic means that there are no recognizable symptoms of a disease. An animal can have a disease or infection without showing visible signs, which can make diagnosis and treatment more difficult. and show no obvious signs. In more severe cases, symptoms such as respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. distress, rapid fatigue during physical activity, and fainting spells may occur.

Another common symptom is cough, which can be caused by fluid accumulation in the lungs due to the inefficient pumping function of the heart. A decreased exercise tolerance may also be observed in some dogs, meaning they tire quickly or have difficulty performing normal physical activities.

Diagnosis

The diagnosis of aortic stenosisAortic stenosis is a narrowing of the aortic valve that obstructs blood flow from the heart into the aorta. This can lead to increased strain on the heart and cause symptoms such as shortness of breath, dizziness, and chest pain. is usually made through a combination of clinical examination, imaging procedures, and special heart examinations. The veterinarian often begins with a thorough physical examination, listening for heart murmurs that may indicate a narrowing of the aortic valve.

Imaging procedures such as X-rays and 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. are used to visualize the heart and assess the structure and function of the aortic valve. Cardiac 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., also called echocardiographyEchocardiography is an ultrasound examination of the heart that assesses the structure and function of the heart valves and chambers. It can provide information about heart size, pumping function, and the presence of heart disease., is particularly useful because it provides a detailed view of the heart and valve and allows the determination of the severity of the narrowing.

In addition, an electrocardiogramSee ECG. (ECG) may be performed to monitor the electrical activity of the heart and detect abnormalities that may be associated with aortic stenosisAortic stenosis is a narrowing of the aortic valve that obstructs blood flow from the heart into the aorta. This can lead to increased strain on the heart and cause symptoms such as shortness of breath, dizziness, and chest pain..

Therapy

The treatment of aortic stenosis in dogs aims to alleviate symptoms 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. In mild cases, regular monitoring by the veterinarian may be sufficient to ensure that the condition does not worsen.

In more severe cases, medication can be used to reduce the strain on the heart. These include beta-blockers, which help control heart rate and lower blood pressure, and diureticsDiuretics are medications that increase urine production in the kidneys to rid the body of excess salt and water. They are often used to treat high blood pressure, heart failure, and certain types of edema., which help remove excess fluid from the body, thereby reducing lung congestion.

In some cases, surgical intervention may be necessary to correct the narrowing of the aortic valve. This can be done by balloon valvuloplastyBalloon valvuloplasty is a medical procedure in which a narrowed heart valve is widened using a catheter equipped with a balloon at its end. The balloon is inserted into the narrowed valve and then inflated to open the narrowing., a procedure in which a balloon catheter is inserted into the narrowed valve and inflated to widen the opening.

Prognosis and follow-up care

The prognosis for dogs with aortic stenosisAortic stenosis is a narrowing of the aortic valve that obstructs blood flow from the heart into the aorta. This can lead to increased strain on the heart and cause symptoms such as shortness of breath, dizziness, and chest pain. depends heavily on the severity of the disease. Dogs with a mild form of the disease can often live a relatively normal life, especially if they are monitored regularly and the symptoms are well controlled.

In dogs with severe aortic stenosisAortic stenosis is a narrowing of the aortic valve that obstructs blood flow from the heart into the aorta. This can lead to increased strain on the heart and cause symptoms such as shortness of breath, dizziness, and chest pain., 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 more guarded. These animals have an increased risk of heart failure and sudden cardiac death, especially if the condition is left untreated. 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 appropriate treatment can improve the quality of life and prolong life expectancy.

Prevention

Since aortic stenosisAortic stenosis is a narrowing of the aortic valve that obstructs blood flow from the heart into the aorta. This can lead to increased strain on the heart and cause symptoms such as shortness of breath, dizziness, and chest pain. is often genetic, the best preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. is the careful 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. Dogs that suffer from aortic stenosisAortic stenosis is a narrowing of the aortic valve that obstructs blood flow from the heart into the aorta. This can lead to increased strain on the heart and cause symptoms such as shortness of breath, dizziness, and chest pain. or carry 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. should be excluded from breeding to reduce the spread of the disease in the populationIn veterinary medicine, the term population refers to a group of animals of a particular species living in a specific geographic area or environment..

For dogs that already suffer from aortic stenosisAortic stenosis is a narrowing of the aortic valve that obstructs blood flow from the heart into the aorta. This can lead to increased strain on the heart and cause symptoms such as shortness of breath, dizziness, and chest pain., it is important to have regular veterinary check-ups to monitor the condition and react to changes early on. A balanced diet and regular but moderate exercise can also help support heart health 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.

Outlook on current research

Aortic stenosis is one of the most common 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. heart diseases in dogs, especially in certain breeds such as Boxers, Newfoundlands, and German Shepherds. Current research focuses on the genetic basis of the disease, as understanding the genetic factors that contribute to aortic stenosisAortic stenosis is a narrowing of the aortic valve that obstructs blood flow from the heart into the aorta. This can lead to increased strain on the heart and cause symptoms such as shortness of breath, dizziness, and chest pain. is crucial for developing breeding strategies that can minimize the risk of this condition. Scientists are using modern genetic analysis techniques to identify specific gene mutations associated with the disease and are trying to develop genetic markers that can be used in breeding.

Another important area of research is the improvement of diagnostic methods. Current studies are investigating the use of advanced imaging techniques such as 3D echocardiographyEchocardiography is an ultrasound examination of the heart that assesses the structure and function of the heart valves and chambers. It can provide information about heart size, pumping function, and the presence of heart disease. and 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. to increase diagnostic accuracy and better assess the severity of the narrowing. These techniques could allow veterinarians to detect aortic stenosisAortic stenosis is a narrowing of the aortic valve that obstructs blood flow from the heart into the aorta. This can lead to increased strain on the heart and cause symptoms such as shortness of breath, dizziness, and chest pain. at an earlier stage and thus take therapeutic measures early on.

Research is also focused on the development of new therapeutic approaches. In addition to traditional 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., which aims to relieve symptoms 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, innovative approaches such as 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. surgical treatment are being worked on. An example of this is balloon-based dilationDilation refers to the widening or expansion of a hollow organ or vessel. It can be physiological (normal) or pathological (due to disease)., in which a balloon catheter is used to widen the narrowed valve. Researchers are also investigating the long-term effects of such interventions and their potential risks and benefits.

A significant advance is also seen in stem cell research. Some studies are exploring the possibility of using stem cells to regenerate damaged heart tissue and improve the function of the heart valves. Although this research is still in its early stages, 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 show promising approaches that could play an important role in the treatment of aortic stenosisAortic stenosis is a narrowing of the aortic valve that obstructs blood flow from the heart into the aorta. This can lead to increased strain on the heart and cause symptoms such as shortness of breath, dizziness, and chest pain. in the future.

In summary, research on aortic stenosisAortic stenosis is a narrowing of the aortic valve that obstructs blood flow from the heart into the aorta. This can lead to increased strain on the heart and cause symptoms such as shortness of breath, dizziness, and chest pain. in dogs is multidisciplinary and ranges from 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. to diagnostics to new therapeutic methods. These advances help to deepen the understanding of the disease and significantly improve the quality of life of affected dogs.

Frequently asked questions (FAQs)

What is aortic stenosisAortic stenosis is a narrowing of the aortic valve that obstructs blood flow from the heart into the aorta. This can lead to increased strain on the heart and cause symptoms such as shortness of breath, dizziness, and chest pain. in dogs? Aortic stenosisAortic stenosis is a narrowing of the aortic valve that obstructs blood flow from the heart into the aorta. This can lead to increased strain on the heart and cause symptoms such as shortness of breath, dizziness, and chest pain. is a heart disease in which the aortic valve, which connects the heart to the aorta, is narrowed. This leads to an obstructionobstruction refers to the blockage or narrowing of a hollow organ or canal, which hinders the normal flow of liquids or gases. In dogs and cats, an obstruction can occur in the digestive tract, airways, or urinary tract and often requires immediate medical treatment. of blood flow from the heart to the body and can cause various health problems.
Which dogs are most commonly affected? Certain breeds are predisposed to aortic stenosisAortic stenosis is a narrowing of the aortic valve that obstructs blood flow from the heart into the aorta. This can lead to increased strain on the heart and cause symptoms such as shortness of breath, dizziness, and chest pain., including Boxers, Newfoundlands, and German Shepherds. Golden Retrievers and Rottweilers may also be more frequently affected. However, the disease can also occur in mixed breeds and other breeds.
How is aortic stenosisAortic stenosis is a narrowing of the aortic valve that obstructs blood flow from the heart into the aorta. This can lead to increased strain on the heart and cause symptoms such as shortness of breath, dizziness, and chest pain. 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 physical examination and listening to the heart with a stethoscopeA stethoscope is a medical instrument used for auscultation, or listening to body sounds, such as heartbeats and lung sounds. It is a fundamental tool in medical diagnostics.. An abnormal heart murmur may be an initial indicationIndication refers to a valid reason or rationale for using a specific treatment, medication, or medical procedure. It is based on the diagnosis and the patient's clinical condition.. Imaging procedures such as echocardiographyEchocardiography is an ultrasound examination of the heart that assesses the structure and function of the heart valves and chambers. It can provide information about heart size, pumping function, and the presence of heart disease. are often used for confirmation.
What symptoms does a dog with aortic stenosisAortic stenosis is a narrowing of the aortic valve that obstructs blood flow from the heart into the aorta. This can lead to increased strain on the heart and cause symptoms such as shortness of breath, dizziness, and chest pain. show? Symptoms may include lethargy, cough, respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. distress, fainting spells, and in severe cases, sudden weakness or collapse. However, some dogs show no symptoms until the disease is advanced.
How is aortic stenosisAortic stenosis is a narrowing of the aortic valve that obstructs blood flow from the heart into the aorta. This can lead to increased strain on the heart and cause symptoms such as shortness of breath, dizziness, and chest pain. treated? Treatment depends on the severity of the disease. In mild cases, regular monitoring may be sufficient. In more severe cases, medications may be prescribed to support heart function. In some cases, surgical intervention may be necessary.
Can affected dogs live normally? With the right treatment and monitoring, many dogs with aortic stenosisAortic stenosis is a narrowing of the aortic valve that obstructs blood flow from the heart into the aorta. This can lead to increased strain on the heart and cause symptoms such as shortness of breath, dizziness, and chest pain. can live a relatively normal life. However, 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 response to treatment.
Is aortic stenosisAortic stenosis is a narrowing of the aortic valve that obstructs blood flow from the heart into the aorta. This can lead to increased strain on the heart and cause symptoms such as shortness of breath, dizziness, and chest pain. hereditary? Yes, aortic stenosisAortic stenosis is a narrowing of the aortic valve that obstructs blood flow from the heart into the aorta. This can lead to increased strain on the heart and cause symptoms such as shortness of breath, dizziness, and chest pain. has a genetic component and can be inherited within certain breeds. Therefore, it is important to pay attention to the health of the parent animals when breeding.
Can puppies be screened for aortic stenosisAortic stenosis is a narrowing of the aortic valve that obstructs blood flow from the heart into the aorta. This can lead to increased strain on the heart and cause symptoms such as shortness of breath, dizziness, and chest pain.? Yes, puppies from breeds that are prone to aortic stenosisAortic stenosis is a narrowing of the aortic valve that obstructs blood flow from the heart into the aorta. This can lead to increased strain on the heart and cause symptoms such as shortness of breath, dizziness, and chest pain. should be screened early. An echocardiographyEchocardiography is an ultrasound examination of the heart that assesses the structure and function of the heart valves and chambers. It can provide information about heart size, pumping function, and the presence of heart disease. can help detect the disease at an early stage.
Are there preventive measures against aortic stenosisAortic stenosis is a narrowing of the aortic valve that obstructs blood flow from the heart into the aorta. This can lead to increased strain on the heart and cause symptoms such as shortness of breath, dizziness, and chest pain.? Since the disease is genetic, there are no specific preventive measures. However, responsible breeding and regular veterinary examinations can help reduce the risk.
How often should a dog with aortic stenosisAortic stenosis is a narrowing of the aortic valve that obstructs blood flow from the heart into the aorta. This can lead to increased strain on the heart and cause symptoms such as shortness of breath, dizziness, and chest pain. go to the vet? The frequency of veterinary examinations depends on the severity of the disease. Regular check-ups are usually necessary to monitor the course of the disease and adjust the treatment.