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Aortic Thromboembolism (Blood Clot in the Aorta) in Dogs

Occurrence: rarer
Location of illness: Chest

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

Aortic thromboembolismThromboembolism is the blockage of a blood vessel by a blood clot (thrombus) that has formed in one place in the circulatory system and then moved to another location. This can lead to serious complications, such as a stroke or pulmonary embolism. in dogs is a condition in which a blood clot (thrombusA thrombus is a blood clot that forms within the circulatory system and adheres to the vessel wall. Thrombi can obstruct blood flow and lead to various health problems.) blocks the body’s main arteryAn artery is a blood vessel that carries blood away from the heart. Unlike veins, which return deoxygenated blood to the heart, arteries transport oxygen-rich blood to the body's tissues. (aorta). This can lead to impaired blood circulation and serious health complications.

The most important facts at a glance

Aortic thromboembolism in dogs is a condition in which blood clots form in the aorta, the largest arteryAn artery is a blood vessel that carries blood away from the heart. Unlike veins, which return deoxygenated blood to the heart, arteries transport oxygen-rich blood to the body's tissues. in the body. This blockage can severely impede blood flow and impair the supply of vital organs. Common causes include underlying heart diseases such as heart failure or cardiac arrhythmiaAn arrhythmia is a heart rhythm disorder in which the heart beats irregularly, either too fast (tachycardia), too slow (bradycardia), or with an irregular pattern. Arrhythmias can be harmless or a sign of serious heart problems., which alter blood flow and promote clot formation. Damage to blood vessel walls due to inflammatory conditions or injuries, as well as systemic diseases such as Cushing’s syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment. or diabetes mellitus, also increase the risk of thrombosisThrombosis is the formation of a blood clot in a blood vessel that can obstruct or block blood flow. Thromboses can occur in veins (venous thrombosis) or arteries (arterial thrombosis)..

Symptoms can include pain, paralysisParalysis is the complete loss of muscle activity in one or more areas of the body, which can lead to immobility and loss of sensation. Paralysis can be caused by injuries, illnesses, or disorders of the nervous system., lameness, respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. distress, and increased respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. rate. 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 physical examination, medical historyThe medical history is the systematic collection of a patient's medical history through questioning. It includes information about previous illnesses, treatments, allergies, and lifestyle habits., and 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 X-rays. Treatment aims to restore blood flow and prevent future thrombusA thrombus is a blood clot that forms within the circulatory system and adheres to the vessel wall. Thrombi can obstruct blood flow and lead to various health problems. formation. Medications such as thrombolytics and anticoagulantsAnticoagulants are medications that slow down or inhibit blood coagulation. They are used to prevent the formation of blood clots and are used in dogs and cats with certain heart conditions or coagulation disorders. are used, and in some cases, surgery may 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 blockage and the underlying cause, with acuteAcute refers to a condition that occurs suddenly and is usually of short duration. In a medical context, it describes symptoms or illnesses that can quickly become serious and require immediate attention. cases that are treated quickly having better chances. PreventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. focuses on treating underlying diseases and optimizing heart function. Regular veterinary examinations are crucial. Research is investigating causes, diagnostic methods, and 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. options to improve treatment outcomes and increase the quality of life for affected dogs.

Causes

The aorta is the largest arteryAn artery is a blood vessel that carries blood away from the heart. Unlike veins, which return deoxygenated blood to the heart, arteries transport oxygen-rich blood to the body's tissues. in the body and transports oxygen-rich blood from the heart to the systemic circulation. A thrombusA thrombus is a blood clot that forms within the circulatory system and adheres to the vessel wall. Thrombi can obstruct blood flow and lead to various health problems. that forms in the aorta or enters the aorta from another region of the body can significantly impair blood flow. Blockage of the aorta or its branches can lead to a reduced blood supply to vital organs.

The formation of thrombi is often caused by underlying heart diseases, especially those that lead to irregular heart function, such as heart failure or cardiac arrhythmiaAn arrhythmia is a heart rhythm disorder in which the heart beats irregularly, either too fast (tachycardia), too slow (bradycardia), or with an irregular pattern. Arrhythmias can be harmless or a sign of serious heart problems.. These conditions can alter blood flow in the heart and promote the formation of blood clots.

Another cause can be damage to the blood vessel walls caused by inflammatory conditions or injuries. Certain systemic diseases, such as Cushing’s syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment. or diabetes mellitus, also increase the risk of thrombusA thrombus is a blood clot that forms within the circulatory system and adheres to the vessel wall. Thrombi can obstruct blood flow and lead to various health problems. formation because they can affect blood clotting.

Symptoms

Very common symptoms:

Common symptoms:

Rare symptoms:

The symptoms of aortic thromboembolismThromboembolism is the blockage of a blood vessel by a blood clot (thrombus) that has formed in one place in the circulatory system and then moved to another location. This can lead to serious complications, such as a stroke or pulmonary embolism. depend on the location and extent of the blockage. AcuteAcute refers to a condition that occurs suddenly and is usually of short duration. In a medical context, it describes symptoms or illnesses that can quickly become serious and require immediate attention. pain often occurs, which affected dogs show through sudden limping or lameness. The hind legs are particularly affected, as the blockage often occurs in the area of the posterior aorta.

In addition, affected dogs may show signs of sudden weakness or paralysisParalysis is the complete loss of muscle activity in one or more areas of the body, which can lead to immobility and loss of sensation. Paralysis can be caused by injuries, illnesses, or disorders of the nervous system.. The affected limbs may appear cold and pale because the blood supply is disrupted. In severe cases, dogs may also show signs of 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, or shock, indicating systemic impairment.

Since the symptoms often appear suddenly and are severe, it is important to seek veterinary help immediately.

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 aortic thromboembolismThromboembolism is the blockage of a blood vessel by a blood clot (thrombus) that has formed in one place in the circulatory system and then moved to another location. This can lead to serious complications, such as a stroke or pulmonary embolism. begins with a thorough physical examination and a detailed medical historyThe medical history is the systematic collection of a patient's medical history through questioning. It includes information about previous illnesses, treatments, allergies, and lifestyle habits. to understand the symptoms and possible triggers. The veterinarian will look for signs of impaired circulation, such as cold limbs or reduced pulsations in the affected areas.

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 X-rays can be used to determine the location and extent of the thrombusA thrombus is a blood clot that forms within the circulatory system and adheres to the vessel wall. Thrombi can obstruct blood flow and lead to various health problems.. A Doppler 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. can be helpful in assessing blood flow in the affected vessels.

In addition, blood tests can be performed to identify underlying diseases or coagulationCoagulation is the process of blood coagulation, in which liquid blood is transformed into a solid clot. This process is crucial for stopping Bleeding and promoting wound healing. disorders. In some cases, 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. or computed tomography (CT)Computed tomography (CT) is an imaging technique that uses X-rays and computer technology to create cross-sectional images of the body. It enables a detailed view of bones, organs, and other structures and is used for the diagnosis of injuries, diseases, and for planning medical interventions. may be required to obtain a detailed view of the vascular structures.

Therapy

The treatment of aortic thromboembolism aims to restore blood flow and prevent future thrombusA thrombus is a blood clot that forms within the circulatory system and adheres to the vessel wall. Thrombi can obstruct blood flow and lead to various health problems. formation. AcuteAcute refers to a condition that occurs suddenly and is usually of short duration. In a medical context, it describes symptoms or illnesses that can quickly become serious and require immediate attention. cases often require intensive medical care. Thrombolytic drugs can be used to dissolve the blood clot, while anticoagulantsAnticoagulants are medications that slow down or inhibit blood coagulation. They are used to prevent the formation of blood clots and are used in dogs and cats with certain heart conditions or coagulation disorders. help prevent the formation of new thrombi.

In some cases, surgery may be necessary to remove the clot directly, especially if 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. is unsuccessful. Intensive monitoring and supportiveSupportive refers to supportive treatments that aim to alleviate symptoms and improve quality of life without directly treating the underlying cause of the disease. care are crucial to stabilize the dog’s general condition and avoid complications.

In addition to acuteAcute refers to a condition that occurs suddenly and is usually of short duration. In a medical context, it describes symptoms or illnesses that can quickly become serious and require immediate attention. treatment, it is important to address the underlying cause of the thromboembolism. This may include treating heart disease, hormonal disorders, or other systemic diseases that contribute to thrombus formation.

Prognosis and follow-up care

The prognosis for aortic thromboembolismThromboembolism is the blockage of a blood vessel by a blood clot (thrombus) that has formed in one place in the circulatory system and then moved to another location. This can lead to serious complications, such as a stroke or pulmonary embolism. depends on several factors, including the severity of the blockage, the rapid initiation of treatment, and the underlying cause. AcuteAcute refers to a condition that occurs suddenly and is usually of short duration. In a medical context, it describes symptoms or illnesses that can quickly become serious and require immediate attention. cases that are treated in a timely manner have a better 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. than those in which treatment is delayed or the cause cannot be resolved.

Unfortunately, despite intensive treatment, the disease can lead to serious complications, especially if vital organs or large areas of muscle are affected. Therefore, the prognosis is often guarded to poor, especially in dogs with severe heart disease or other chronic health problems.

Continuous monitoring and regular veterinary follow-up are crucial to monitor the dog’s health and be able to react to changes early.

Prevention

The preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. of aortic thromboembolism in dogs focuses on controlling and treating underlying diseases that can increase the risk of thrombosisThrombosis is the formation of a blood clot in a blood vessel that can obstruct or block blood flow. Thromboses can occur in veins (venous thrombosis) or arteries (arterial thrombosis).. This includes regular monitoring and treatment of heart disease to optimize heart function and minimize the risk of irregular heartbeats.

A balanced diet and a healthy lifestyle can also help reduce the risk of thrombusA thrombus is a blood clot that forms within the circulatory system and adheres to the vessel wall. Thrombi can obstruct blood flow and lead to various health problems. formation. In dogs with known risk factors, the veterinarian may prescribe prophylactic medications to control blood clotting and reduce the risk of thrombosisThrombosis is the formation of a blood clot in a blood vessel that can obstruct or block blood flow. Thromboses can occur in veins (venous thrombosis) or arteries (arterial thrombosis)..

Regular veterinary examinations are crucial to detect health changes early and take appropriate measures. Close cooperation with the veterinarian can help develop individual preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. strategies tailored to the dog’s specific needs and health risks.

Outlook on current research

Aortic thromboembolism in dogs is an area that is attracting increasing interest in veterinary medical research. Key areas of research include investigating the causes that lead to the formation of thrombi in the aorta. This research aims to identify the genetic and environmental factors that increase the risk of developing blood clots in dogs.

Another significant area of research is the development and improvement of diagnostic methods. Current studies are investigating the use of advanced imaging techniques such as 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. and computed tomography (CT)Computed tomography (CT) is an imaging technique that uses X-rays and computer technology to create cross-sectional images of the body. It enables a detailed view of bones, organs, and other structures and is used for the diagnosis of injuries, diseases, and for planning medical interventions. to detect thrombi early and more accurately. Improving diagnostic accuracy can help improve treatment outcomes by allowing 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 be started early.

The 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. of aortic thromboembolismThromboembolism is the blockage of a blood vessel by a blood clot (thrombus) that has formed in one place in the circulatory system and then moved to another location. This can lead to serious complications, such as a stroke or pulmonary embolism. is also being intensively researched. A variety of studies are investigating the effectiveness of various medications, including anticoagulantsAnticoagulants are medications that slow down or inhibit blood coagulation. They are used to prevent the formation of blood clots and are used in dogs and cats with certain heart conditions or coagulation disorders. and thrombolytics, to develop the best treatment protocols. Researchers are working to optimize the dosage and combination of these medications to achieve the best results with the fewest side effects.

Another exciting research approach is the investigation of preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. strategies. Identifying risk factors and developing preventive measures could help reduce the incidenceIncidence refers to the number of new cases of a disease or condition that occur within a specific time period in a specific population group. It provides information about the risk of contracting the disease. of aortic thromboembolismThromboembolism is the blockage of a blood vessel by a blood clot (thrombus) that has formed in one place in the circulatory system and then moved to another location. This can lead to serious complications, such as a stroke or pulmonary embolism.. These include nutritional studies that examine the role of diets in preventing blood clots, as well as studies that assess the effects of exercise and lifestyle on the risk of thrombosisThrombosis is the formation of a blood clot in a blood vessel that can obstruct or block blood flow. Thromboses can occur in veins (venous thrombosis) or arteries (arterial thrombosis)..

In summary, research on aortic thromboembolismThromboembolism is the blockage of a blood vessel by a blood clot (thrombus) that has formed in one place in the circulatory system and then moved to another location. This can lead to serious complications, such as a stroke or pulmonary embolism. in dogs is a multidisciplinary approach that includes genetic, diagnostic, therapeutic, and preventive aspects. The continuous development and increasing understanding of this disease could lead to improved 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. options and a better quality of life for affected dogs in the future.

Frequently asked questions (FAQs)

What is aortic thromboembolismThromboembolism is the blockage of a blood vessel by a blood clot (thrombus) that has formed in one place in the circulatory system and then moved to another location. This can lead to serious complications, such as a stroke or pulmonary embolism. in dogs? Aortic thromboembolismThromboembolism is the blockage of a blood vessel by a blood clot (thrombus) that has formed in one place in the circulatory system and then moved to another location. This can lead to serious complications, such as a stroke or pulmonary embolism. is a condition in which a blood clot forms in the main artery (aorta) of a dog. This clot can block blood flow and lead to serious health problems.
What symptoms does a dog with aortic thromboembolismThromboembolism is the blockage of a blood vessel by a blood clot (thrombus) that has formed in one place in the circulatory system and then moved to another location. This can lead to serious complications, such as a stroke or pulmonary embolism. show? The symptoms can include sudden lameness, pain, coldness of the affected limbs, and in severe cases, paralysisParalysis is the complete loss of muscle activity in one or more areas of the body, which can lead to immobility and loss of sensation. Paralysis can be caused by injuries, illnesses, or disorders of the nervous system.. An affected dog may also show signs of sudden weakness or respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. distress.
What are the causes of aortic thromboembolismThromboembolism is the blockage of a blood vessel by a blood clot (thrombus) that has formed in one place in the circulatory system and then moved to another location. This can lead to serious complications, such as a stroke or pulmonary embolism. in dogs? The causes are varied and can include genetic predispositions, heart disease, blood clotting disorders, or other systemic diseases that affect blood clotting.
How is aortic thromboembolismThromboembolism is the blockage of a blood vessel by a blood clot (thrombus) that has formed in one place in the circulatory system and then moved to another location. This can lead to serious complications, such as a stroke or pulmonary embolism. 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 through a combination of clinical examination, blood tests, and 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., X-rays, or CT scans to confirm the presence of a thrombusA thrombus is a blood clot that forms within the circulatory system and adheres to the vessel wall. Thrombi can obstruct blood flow and lead to various health problems..
What treatment options are available for this disease? Treatment may include the use of blood-thinning medications, thrombolytics to dissolve the clot, pain management, and in some cases, surgical procedures to remove the thrombusA thrombus is a blood clot that forms within the circulatory system and adheres to the vessel wall. Thrombi can obstruct blood flow and lead to various health problems..
Is aortic thromboembolismThromboembolism is the blockage of a blood vessel by a blood clot (thrombus) that has formed in one place in the circulatory system and then moved to another location. This can lead to serious complications, such as a stroke or pulmonary embolism. life-threatening? Yes, it can be life-threatening, especially if not treated promptly. The blockage of blood flow can lead to serious complications, including tissue damage and organ failure.
Can all dog breeds be affected by aortic thromboembolismThromboembolism is the blockage of a blood vessel by a blood clot (thrombus) that has formed in one place in the circulatory system and then moved to another location. This can lead to serious complications, such as a stroke or pulmonary embolism.? Theoretically, any dog breed can be affected, but certain breeds with genetic predispositions or pre-existing heart disease may be at higher risk.
How can the risk of aortic thromboembolismThromboembolism is the blockage of a blood vessel by a blood clot (thrombus) that has formed in one place in the circulatory system and then moved to another location. This can lead to serious complications, such as a stroke or pulmonary embolism. be reduced in dogs? Regular veterinary examinations, a balanced diet, sufficient exercise, and attention to risk factors such as overweight or heart disease can help reduce the risk.
How common is aortic thromboembolismThromboembolism is the blockage of a blood vessel by a blood clot (thrombus) that has formed in one place in the circulatory system and then moved to another location. This can lead to serious complications, such as a stroke or pulmonary embolism. in dogs? It is a relatively rare disease, but exact frequency figures vary. However, awareness and 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 the disease are increasing, which may lead to increased detection.
Can aortic thromboembolismThromboembolism is the blockage of a blood vessel by a blood clot (thrombus) that has formed in one place in the circulatory system and then moved to another location. This can lead to serious complications, such as a stroke or pulmonary embolism. be reversed? While an existing clot can often be treated to restore blood flow, the long-term effects on the dog’s health vary. 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 are crucial to achieve the best results.