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Thyroid Carcinoma (Thyroid Cancer) in Dogs

Occurrence: rarer
Location of illness: Head/Neck

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

Thyroid carcinomaA carcinoma is a type of cancer that originates in the epithelial cells that line the inner and outer surfaces of the body. Carcinomas are the most common form of cancer. in dogs is a malignantMalignant means "cancerous" and is used to describe tumors or neoplasms that grow invasively and have the ability to metastasize. Malignant tumors can cause serious health problems in dogs and cats. tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. disease that originates in the cells of the thyroid gland. This gland is responsible for producing important hormones that regulate metabolism and other vital body functions.

The most important facts at a glance

Thyroid carcinoma in dogs is a disease of the thyroid gland, a small organ in the neck that produces important hormones for metabolism. The causes can be genetic factors, environmental toxins, or cell mutations that lead to tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. growth. Symptoms include swellings on the neck, cough, difficulty swallowing, and weight loss. 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. begins with a physical examination and blood tests to check hormoneHormones are chemical messengers produced by endocrine glands and released into the bloodstream to affect specific cells or organs in the body. They regulate numerous bodily functions, including growth, metabolism, and reproduction. levels. 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 CT scans help to locate the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. and check its spread. A biopsyA biopsy is a medical procedure in which a small amount of tissue is removed from the body to be examined under a microscope for signs of disease. Biopsies can help diagnose cancer and other conditions. provides the final 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.. Treatment depends on the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. size and metastasisA metastasis is a secondary tumor that originates from a primary, malignant tumor in another part of the body. Metastases indicate that cancer has spread in the body. and may include surgery, radiation therapyRadiation therapy is the use of radiation, most often to treat cancer. It can be used to kill cancer cells or slow their growth without significantly damaging surrounding healthy tissue., chemotherapyChemotherapy refers to the treatment of diseases, especially cancer, with chemical substances or drugs. It aims to kill cancer cells or prevent their growth, but can also affect healthy cells., or radioactive iodine. Early removal can 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., while metastasized cancerCancer refers to the uncontrolled proliferation of cells that can lead to tumors or spread throughout the body. Various types of cancer occur in dogs and cats, ranging from skin cancer to lymphomas. requires more aggressive 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.. PreventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. is difficult, but a balanced diet and regular veterinary examinations can be helpful. Research focuses on genetic predispositions and new diagnostic and treatment approaches. Advanced imaging techniques and targeted therapies show promising results. A multidisciplinary approach that includes 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., imaging, and nutrition could improve treatment options for dogs.

Causes

The thyroid gland is a small but important organ located in the dog’s neck area. It consists of two lobes that produce hormones such as thyroxine (T4)Thyroxine, also known as T4, is a thyroid hormone that plays an important role in metabolism. It affects growth, development, and energy consumption in the body. and triiodothyronine (T3). These hormones are crucial for regulating metabolism, heart function, digestion, and muscle control. The thyroid gland receives its signals from the pituitary glandThe pituitary gland, also known as the hypophysis, is a small gland located beneath the brain that produces hormones that control the functions of other endocrine glands. It plays a central role in the body's hormonal system., which releases thyroid-stimulating hormoneHormones are chemical messengers produced by endocrine glands and released into the bloodstream to affect specific cells or organs in the body. They regulate numerous bodily functions, including growth, metabolism, and reproduction. (TSH) to regulate hormoneHormones are chemical messengers produced by endocrine glands and released into the bloodstream to affect specific cells or organs in the body. They regulate numerous bodily functions, including growth, metabolism, and reproduction. production.

The development of cancerCancer refers to the uncontrolled proliferation of cells that can lead to tumors or spread throughout the body. Various types of cancer occur in dogs and cats, ranging from skin cancer to lymphomas. in the thyroid gland can be favored by various factors. Genetic predispositions play a role, with certain breeds being more susceptible. Environmental factors such as radiation or toxic exposures could also play a role. A mutationA mutation is a permanent change in the DNA sequence (genetic material) of an organism. In dogs and cats, mutations can lead to genetic diseases or desirable changes in certain traits. in the cells of the thyroid gland can lead to uncontrolled cell growth, which eventually leads to the formation of a tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions..

Some studies suggest that hormonal imbalances or 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. inflammatory conditions of the thyroid gland may increase the risk of developing carcinomaA carcinoma is a type of cancer that originates in the epithelial cells that line the inner and outer surfaces of the body. Carcinomas are the most common form of cancer.. In addition, nutritional factors could also play a role, with a deficiencyDeficiency means a lack or absence of a necessary substance required for normal bodily functions or health, such as vitamins, minerals, or hormones. of certain nutrients or an excess of others potentially influencing the risk.

Symptoms

Very common symptoms:

Common symptoms:

Rare symptoms:

The symptoms of thyroid carcinomaA carcinoma is a type of cancer that originates in the epithelial cells that line the inner and outer surfaces of the body. Carcinomas are the most common form of cancer. in dogs can vary and often depend on the size and 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 tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions.. One of the most common signs is a visible or palpable swelling in the neck area. This swelling may be noticed when petting the dog.

Other symptoms include weight loss despite normal or even increased appetite, lethargy, changes in the coat or skin, respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. distress, hoarseness, or cough. In advanced disease, symptoms such as difficulty swallowing or lymph node swelling in the neck area may occur.

In some cases, the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. cells produce excessive hormones, leading to a condition called hyperthyroidism. This can lead to symptoms such as increased thirst and urination, increased heart rate, and restlessness.

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 thyroid carcinomaA carcinoma is a type of cancer that originates in the epithelial cells that line the inner and outer surfaces of the body. Carcinomas are the most common form of cancer. usually begins with a thorough clinical examination, during which the veterinarian palpates the dog’s neck to detect any swellings or nodules. If there is a suspicion, a blood testA blood test is a laboratory procedure in which blood is drawn and analyzed to obtain information about the body's health. It can include various parameters such as blood sugar, blood count, liver and kidney values. is often performed to check hormoneHormones are chemical messengers produced by endocrine glands and released into the bloodstream to affect specific cells or organs in the body. They regulate numerous bodily functions, including growth, metabolism, and reproduction. levels and rule out other possible causes for the symptoms.

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., X-rays, or CT scans can be used to visualize the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. and its size. These methods also help determine whether the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. has metastasized, i.e., spread to other parts of the body.

A definitive 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 often made by a fine needle aspiration or a biopsyA biopsy is a medical procedure in which a small amount of tissue is removed from the body to be examined under a microscope for signs of disease. Biopsies can help diagnose cancer and other conditions. of the tumor. These procedures allow cell samples of the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. to be taken, which are then examined under the microscope to determine whether it is a malignantMalignant means "cancerous" and is used to describe tumors or neoplasms that grow invasively and have the ability to metastasize. Malignant tumors can cause serious health problems in dogs and cats. carcinomaA carcinoma is a type of cancer that originates in the epithelial cells that line the inner and outer surfaces of the body. Carcinomas are the most common form of cancer..

Therapy

The treatment of thyroid carcinoma in dogs depends on several factors, including the size and location of the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions., whether it has metastasized, and the dog’s general health. One of the most common treatment methods is surgical removal of the tumor, especially if it is well-defined and accessible.

In cases where complete surgical removal is not possible, or as a supplement to surgery, radiation therapyRadiation therapy is the use of radiation, most often to treat cancer. It can be used to kill cancer cells or slow their growth without significantly damaging surrounding healthy tissue. can be used to kill remaining cancerCancer refers to the uncontrolled proliferation of cells that can lead to tumors or spread throughout the body. Various types of cancer occur in dogs and cats, ranging from skin cancer to lymphomas. cells and reduce the risk of recurrence. Another option is chemotherapyChemotherapy refers to the treatment of diseases, especially cancer, with chemical substances or drugs. It aims to kill cancer cells or prevent their growth, but can also affect healthy cells., which is used in advanced stages or in cases of metastasizingA metastasis is a secondary tumor that originates from a primary, malignant tumor in another part of the body. Metastases indicate that cancer has spread in the body. cancer.

In some cases, treatment with radioactive iodine may be considered, especially if the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. is hormone-producing. 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. aims to destroy the overactive thyroid gland and normalize hormoneHormones are chemical messengers produced by endocrine glands and released into the bloodstream to affect specific cells or organs in the body. They regulate numerous bodily functions, including growth, metabolism, and reproduction. production.

Prognosis and follow-up care

The prognosis for a dog with thyroid carcinomaA carcinoma is a type of cancer that originates in the epithelial cells that line the inner and outer surfaces of the body. Carcinomas are the most common form of cancer. depends on 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. If the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. is detected early and completely removed, 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. can be relatively favorable. Dogs can often live for many years after successful treatment.

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. worsens if the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. has already metastasized or grown into surrounding tissues. In such cases, aggressive treatment is required, and survival time may be reduced. Regular follow-up checks are crucial to detect any recurrence of the disease early.

Prevention

While there is no specific method to completely prevent thyroid carcinomas in dogs, some measures may reduce the risk. A balanced diet and regular veterinary check-ups help monitor the dog’s general health and respond early to potential problems.

Avoiding environmental toxins and minimizing exposureExposure refers to the Contact with or subjection to certain substances, environmental factors, or pathogens. In veterinary medicine, this can include Contact with toxins, allergens, or infectious agents that can cause health problems in dogs and cats. to known carcinogens can also be helpful. In breeds that are genetically more susceptible to thyroid diseases, regular monitoring of thyroid function may be useful to detect potential problems early.

Outlook on current research

Research on thyroid carcinomas in dogs is currently focused on various aspects, including the genetic basis, the improvement of diagnostic methods, and the development of new treatment approaches. One of the current challenges in veterinary medicine is a better understanding of the genetic predispositions that can lead to an increased risk of developing thyroid cancerCancer refers to the uncontrolled proliferation of cells that can lead to tumors or spread throughout the body. Various types of cancer occur in dogs and cats, ranging from skin cancer to lymphomas. in certain dog breeds. Studies have shown that genetic factors play a role, but the exact inheritance and the genes involved have not yet been fully identified. Therefore, researchers are working intensively to find genetic markers that could be useful in early detection and risk assessment.

Another important area of research is imaging technology. Traditional methods include 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. examinations, but newer techniques such as 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. 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. have shown higher accuracy in detecting tumors and metastasesA metastasis is a secondary tumor that originates from a primary, malignant tumor in another part of the body. Metastases indicate that cancer has spread in the body.. Researchers are also investigating the role of positron emission tomography (PET) in conjunction with CT to obtain even more detailed images. By using these advanced imaging technologies, scientists hope to improve 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 thyroid carcinomas in dogs and optimize treatment outcomes.

In terms of treatment, there are ongoing studies on new drug approaches, including targeted therapies and immunotherapies. Targeted therapies that block specific signaling pathways responsible for tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. growth are showing promising results. Immunotherapies, which stimulate the body’s own 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. to attack cancerCancer refers to the uncontrolled proliferation of cells that can lead to tumors or spread throughout the body. Various types of cancer occur in dogs and cats, ranging from skin cancer to lymphomas. cells, are also an emerging area. These treatments could be used in combination with traditional methods such as surgery and radiation therapyRadiation therapy is the use of radiation, most often to treat cancer. It can be used to kill cancer cells or slow their growth without significantly damaging surrounding healthy tissue. to improve the survival rates of dogs with thyroid cancerCancer refers to the uncontrolled proliferation of cells that can lead to tumors or spread throughout the body. Various types of cancer occur in dogs and cats, ranging from skin cancer to lymphomas..

Research on nutrition and its influence on the development and 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 thyroid carcinomas in dogs is also a growing field. 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 certain diets may influence the risk of cancerCancer refers to the uncontrolled proliferation of cells that can lead to tumors or spread throughout the body. Various types of cancer occur in dogs and cats, ranging from skin cancer to lymphomas. by having anti-inflammatory properties or positively influencing thyroid function. Further studies are needed to better understand these relationships and provide informed nutritional recommendations for dogs with thyroid problems.

Overall, research shows that a multidisciplinary approach that includes 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., advanced imaging, innovative therapies, and nutrition has the potential to significantly improve the treatment of thyroid carcinomas in dogs. While many of these approaches are still in the experimental stage, they offer hope for better diagnostic methods and more effective treatments in the future.

Frequently asked questions (FAQs)

What is thyroid carcinoma in dogs? Thyroid carcinomaA carcinoma is a type of cancer that originates in the epithelial cells that line the inner and outer surfaces of the body. Carcinomas are the most common form of cancer. is a malignantMalignant means "cancerous" and is used to describe tumors or neoplasms that grow invasively and have the ability to metastasize. Malignant tumors can cause serious health problems in dogs and cats. tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. disease of the thyroid gland that can occur in dogs. It is a relatively rare but aggressive form of cancerCancer refers to the uncontrolled proliferation of cells that can lead to tumors or spread throughout the body. Various types of cancer occur in dogs and cats, ranging from skin cancer to lymphomas. that is often diagnosed in an advanced stage.
What symptoms may indicate thyroid carcinomaA carcinoma is a type of cancer that originates in the epithelial cells that line the inner and outer surfaces of the body. Carcinomas are the most common form of cancer. in my dog? Symptoms may include a swelling on the neck, respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. distress, cough, difficulty swallowing, and weight loss. Since these symptoms can also occur with other diseases, an accurate 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. by a veterinarian is required.
How is thyroid carcinomaA carcinoma is a type of cancer that originates in the epithelial cells that line the inner and outer surfaces of the body. Carcinomas are the most common form of cancer. diagnosed in dogs? 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 physical examination, blood tests, 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 CT, and a biopsyA biopsy is a medical procedure in which a small amount of tissue is removed from the body to be examined under a microscope for signs of disease. Biopsies can help diagnose cancer and other conditions. of the suspicious tissue.
What treatment options are available for dogs with thyroid carcinoma? Treatment may include surgical removal of the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions., radiation therapyRadiation therapy is the use of radiation, most often to treat cancer. It can be used to kill cancer cells or slow their growth without significantly damaging surrounding healthy tissue., chemotherapyChemotherapy refers to the treatment of diseases, especially cancer, with chemical substances or drugs. It aims to kill cancer cells or prevent their growth, but can also affect healthy cells., or a combination of these methods. The choice of treatment depends on the size and stage of the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions., as well as the dog’s general health.
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 a dog with thyroid carcinomaA carcinoma is a type of cancer that originates in the epithelial cells that line the inner and outer surfaces of the body. Carcinomas are the most common form of cancer.? 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 various factors, including tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. size, stage, metastasisA metastasis is a secondary tumor that originates from a primary, malignant tumor in another part of the body. Metastases indicate that cancer has spread in the body., and the chosen treatment method. 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 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. may be better.
Can certain dog breeds have a higher risk of thyroid carcinomas? Yes, some studies suggest that larger dog breeds such as Golden Retrievers and Boxers may have a higher risk. However, further research is needed to fully understand these relationships.
Are there ways to reduce the risk of thyroid carcinoma in my dog? While there are no sure preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. measures, regular veterinary check-ups and a balanced diet can help support your dog’s overall health and detect early signs of problems.
How long can a dog with thyroid carcinomaA carcinoma is a type of cancer that originates in the epithelial cells that line the inner and outer surfaces of the body. Carcinomas are the most common form of cancer. live? Life expectancy varies greatly and depends on many factors, including the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. stage at 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 the response to treatment. Some dogs can live several years with treatment, while others may have a shorter survival time.
What side effects can occur during the treatment of thyroid carcinomaA carcinoma is a type of cancer that originates in the epithelial cells that line the inner and outer surfaces of the body. Carcinomas are the most common form of cancer.? Side effects can vary depending on the treatment method. Surgical procedures carry the risk of complications such as infections, while chemotherapyChemotherapy refers to the treatment of diseases, especially cancer, with chemical substances or drugs. It aims to kill cancer cells or prevent their growth, but can also affect healthy cells. and radiation therapyRadiation therapy is the use of radiation, most often to treat cancer. It can be used to kill cancer cells or slow their growth without significantly damaging surrounding healthy tissue. can cause side effects such as nausea, lethargy, and hair loss.
Is thyroid carcinomaA carcinoma is a type of cancer that originates in the epithelial cells that line the inner and outer surfaces of the body. Carcinomas are the most common form of cancer. in dogs contagiousContagious means infectious. Diseases that can easily be transmitted from one animal to another or from animals to humans are referred to as contagious. to humans or other animals? No, thyroid carcinomaA carcinoma is a type of cancer that originates in the epithelial cells that line the inner and outer surfaces of the body. Carcinomas are the most common form of cancer. is not contagiousContagious means infectious. Diseases that can easily be transmitted from one animal to another or from animals to humans are referred to as contagious. and cannot be transmitted to humans or other animals. It is a disease that is influenced by genetic and possibly environmental factors.