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Hiatal Hernia (Displacement of the Stomach or Parts of the Stomach into the Chest Cavity) in Dogs

Occurrence: rarer
Location of illness: Abdomen/pelvis, Chest

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

A hiatal hernia in dogs is a condition in which parts of the stomach are displaced through the diaphragm into the chest cavity. This can lead to various health problems, ranging from mild digestive issues to severe respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. distress.

The most important facts at a glance

A hiatal hernia in dogs is caused by a weakness or malformation in the area of the diaphragm, which separates the chest cavity from the abdominalThe term "abdominal" refers to anything that concerns the belly or the abdomen. It is an adjectival expression used to describe the location, symptoms, or conditions that occur in the abdominal area. cavity. In this condition, parts of the stomach are displaced into the chest cavity. There are two main types: the axial hernia, in which the gastroesophagealGastroesophageal refers to the stomach (gastro-) and the esophagus. The term is often used in connection with gastroesophageal reflux, in which stomach contents flow back into the esophagus, which can lead to irritation and Inflammatory conditions. junction shifts upward, and the paraesophageal hernia, in which a portion of the stomach pushes into the chest cavity next to the esophagusThe esophagus is a muscular tube that connects the pharynx to the stomach. It transports food from the mouth to the stomach through rhythmic contractions (peristalsis).. Causes can be 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. defects, traumaA trauma refers to a physical injury or damage caused by external force. Traumas can range from simple cuts to severe multiple injuries., 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. pressure on the diaphragm. Symptoms often include regurgitationRegurgitation is the reflux of food or liquid from the stomach into the mouth without Vomiting or strong abdominal muscle contractions. It may be a sign of diseases of the esophagus or other gastrointestinal problems., weight loss, vomiting, increased salivation, and shortness of breath. 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 and imaging procedures such as X-rays or endoscopyEndoscopy is a diagnostic procedure that uses an endoscope (a thin, flexible tube with a light source and a camera at the end) to examine and visualize the inside of the body, often for diagnostic or therapeutic purposes.. Treatment depends on the severity and ranges from conservative measures such as feeding changes and medications to surgical procedures. 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 but can be good with successful treatment. PreventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. is difficult, but a healthy weight and regular veterinary check-ups can help minimize the risk. Research focuses on genetic predispositions and improving diagnostic and treatment methods.

Causes

Hiatal hernias are caused by a weakness or malformation in the area of the diaphragm, which separates the chest cavity from the abdominalThe term "abdominal" refers to anything that concerns the belly or the abdomen. It is an adjectival expression used to describe the location, symptoms, or conditions that occur in the abdominal area. cavity. The diaphragm has a natural opening, the hiatus, through which the esophagusThe esophagus is a muscular tube that connects the pharynx to the stomach. It transports food from the mouth to the stomach through rhythmic contractions (peristalsis). passes. A hiatal hernia occurs when this hiatus is enlarged or the tissue around it is weakened, allowing parts of the stomach to slide into the chest cavity.

There are two main types of hiatal hernias: the axial (or sliding) hernia and the paraesophageal hernia. In an axial hernia, the gastroesophagealGastroesophageal refers to the stomach (gastro-) and the esophagus. The term is often used in connection with gastroesophageal reflux, in which stomach contents flow back into the esophagus, which can lead to irritation and Inflammatory conditions. junction moves upward into the chest cavity along with a portion of the stomach. In a paraesophageal hernia, on the other hand, the gastroesophagealGastroesophageal refers to the stomach (gastro-) and the esophagus. The term is often used in connection with gastroesophageal reflux, in which stomach contents flow back into the esophagus, which can lead to irritation and Inflammatory conditions. junction remains in place, but a portion of the stomach pushes into the chest cavity next to the esophagusThe esophagus is a muscular tube that connects the pharynx to the stomach. It transports food from the mouth to the stomach through rhythmic contractions (peristalsis)..

The causes of hiatal hernias in dogs are varied. 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. defects of the diaphragm can play a role, especially in young dogs. Traumatic events, such as a severe blow to the abdominalThe term "abdominal" refers to anything that concerns the belly or the abdomen. It is an adjectival expression used to describe the location, symptoms, or conditions that occur in the abdominal area. or chest area, can also cause a hernia. It is also possible that certain breeds are more susceptible to this condition due to genetic predispositions.

Acquired causes include 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. pressure on the diaphragm, as can occur in overweight dogs or those who frequently have severe respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. distress. Repeated severe coughing, vomiting, 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. gastritis can also lead to weakening of the diaphragm and ultimately to a hernia.

Symptoms

Very common symptoms:

Common symptoms:

The symptoms of a hiatal hernia in dogs can vary greatly and often depend on the size of the hernia and the extent of the displacement. Some dogs may not show any obvious symptoms, while others suffer from considerable discomfort.

Typical symptoms include vomiting, especially after eating, and difficulty swallowing. Dogs with a hiatal hernia may also suffer from heartburn or esophagitis, which can manifest as excessive salivation or cough.

In more severe cases, respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. distress can occur because the displaced portions of the stomach can put pressure on the lungs. Affected dogs may show signs of shortness of breath, such as rapid or labored breathing, and in extreme cases, collapse may occur.

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 hiatal hernia begins with a thorough physical examination and the collection of the dog’s 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.. The veterinarian will ask about specific symptoms and may order a series of diagnostic tests to confirm the suspicion of a hiatal hernia.

Imaging procedures are crucial for 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.. An X-rayX-ray is an imaging technique that uses X-rays to create images of the inside of the body. It is often used to diagnose bone fractures, lung diseases, and other conditions. of the chest and abdomenThe abdomen, also known as the abdominal cavity, is the part of the body located between the rib cage and the pelvis. It houses several important organs, including the stomach, liver, kidneys, intestines, and spleen. can provide information about the location of the stomach. A contrast X-rayX-ray is an imaging technique that uses X-rays to create images of the inside of the body. It is often used to diagnose bone fractures, lung diseases, and other conditions., in which the dog drinks a special liquid, can improve the visualization of the esophagusThe esophagus is a muscular tube that connects the pharynx to the stomach. It transports food from the mouth to the stomach through rhythmic contractions (peristalsis). and stomach in the X-rayX-ray is an imaging technique that uses X-rays to create images of the inside of the body. It is often used to diagnose bone fractures, lung diseases, and other conditions. image.

An endoscopyEndoscopy is a diagnostic procedure that uses an endoscope (a thin, flexible tube with a light source and a camera at the end) to examine and visualize the inside of the body, often for diagnostic or therapeutic purposes. can also be helpful. A flexible tube with a camera is inserted through the esophagusThe esophagus is a muscular tube that connects the pharynx to the stomach. It transports food from the mouth to the stomach through rhythmic contractions (peristalsis). into the stomach to directly view the extent of the hernia and any inflammatory conditions or damage to the esophagusThe esophagus is a muscular tube that connects the pharynx to the stomach. It transports food from the mouth to the stomach through rhythmic contractions (peristalsis)..

In some cases, a 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. scan or magnetic resonance imaging (MRI)Magnetic resonance imaging is an imaging technique that uses strong magnetic fields and radio waves to create detailed images of the inside of the body. It is used in veterinary medicine to diagnose diseases of the brain, spine, and other organs. may also be necessary to obtain a detailed view of the internal structures.

Therapy

The treatment of a hiatal hernia in dogs depends on the severity of the condition and the individual needs of the animal. In some cases, conservative treatment may be sufficient, while more severe cases may require surgical intervention.

Conservative measures include changing feeding habits to reduce pressure on the diaphragm. This can be achieved by feeding frequent, small meals and avoiding foods that are difficult to digest. Medications that reduce stomach acid production can also help relieve symptoms and prevent irritation of the esophagus.

In more severe cases, especially if the hernia causes respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. distress or conservative treatment is unsuccessful, surgery may be necessary. The surgical procedure aims to move the stomach back into the abdominalThe term "abdominal" refers to anything that concerns the belly or the abdomen. It is an adjectival expression used to describe the location, symptoms, or conditions that occur in the abdominal area. cavity and reduce the hiatus to prevent further slippage of the stomach.

The surgery can be complex and requires the expertise of an experienced surgeon. The risks and benefits of surgery must be carefully weighed, especially in older dogs or those with pre-existing health conditions.

Prognosis and follow-up care

The prognosis for dogs with a hiatal hernia varies depending on the severity of the condition and the treatment chosen. With successful conservative treatment or a successful surgical procedure, 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 good, and the dog can live a normal life without significant limitations.

Dogs that show only mild symptoms and respond well to medical treatment usually have a good 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.. However, regular monitoring by the veterinarian is important to detect possible relapses or complications early.

In dogs that require surgery, 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 several factors, including the dog’s general health, the extent of the hernia, and the surgeon’s experience. In general, dogs that recover well from surgery and do not develop further complications have a positive 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..

In rare cases, complications can occur, such as a recurrentRecurrent refers to a disease that repeatedly returns or worsens after a temporary remission or improvement. hernia or an infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. after surgery. These can negatively affect 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 may require further medical intervention.

Prevention

PreventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. of hiatal hernias in dogs can be difficult, as some causes, such as genetic predispositions or 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. anomalies, are unavoidable. Nevertheless, there are some measures that can reduce the risk of a hiatal hernia.

A healthy diet and a healthy weight are crucial to minimize pressure on the diaphragm. Overweight should be avoided, and dogs should be exercised regularly to promote their general health.

It is also important to avoid injuries to the abdominalThe term "abdominal" refers to anything that concerns the belly or the abdomen. It is an adjectival expression used to describe the location, symptoms, or conditions that occur in the abdominal area. or chest area. Dogs should be kept in safe environments, and risky activities should be minimized to prevent traumaA trauma refers to a physical injury or damage caused by external force. Traumas can range from simple cuts to severe multiple injuries. that could lead to a hernia.

Regular veterinary check-ups can help detect early signs of a hiatal hernia and treat it in time before it leads to serious problems. Pet owners should pay attention to changes in their dogs’ behavior or health and seek veterinary advice early if necessary.

Outlook on current research

Research on hiatal hernias in dogs is still quite limited compared to human medicine, but there have been some important advances. A key area of research is 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. to this condition. Researchers are investigating whether certain dog breeds are more susceptible to hiatal hernias than others, and whether there are genetic markers that indicate a higher risk. These studies could influence breeding conditions in the future and help reduce the occurrence of this condition.

Another area of research is the improvement of diagnostic methods. Currently, hiatal hernias are often diagnosed by X-rays or endoscopyEndoscopy is a diagnostic procedure that uses an endoscope (a thin, flexible tube with a light source and a camera at the end) to examine and visualize the inside of the body, often for diagnostic or therapeutic purposes., but new imaging techniques are being developed 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. and more accurate. Advances in 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., for example, could allow earlier and more precise 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., which could improve treatment outcomes.

In the treatment of hiatal hernias in dogs, the focus of research is on the development of new surgical techniques. Traditionally, hiatal hernias are treated surgically, but new 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. procedures are being tested that could reduce the risk of complications and the recovery time. These techniques, such as laparoscopic surgery, could significantly improve the quality of life of affected dogs.

There is also progress in drug treatment. Researchers are investigating how certain drugs can help relieve symptoms and reduce the need for surgery. Proton pump inhibitors and H2-receptor antagonists are just some of the drugs currently being researched.

In the long term, research aims to improve both the preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. and treatment of hiatal hernias. By better understanding the pathophysiological mechanisms of this disease, scientists hope to develop targeted therapies that address the cause directly and not just treat the symptoms.

Frequently asked questions (FAQs)

What is a hiatal hernia in dogs? A hiatal hernia in dogs is a condition in which part of the stomach is displaced through the diaphragm into the chest cavity. This can lead to a variety of symptoms, including vomiting, cough, and 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 symptoms of a hiatal hernia? The most common symptoms include vomiting, especially after eating, cough, shortness of breath, weight loss, and in some cases, salivation. The symptoms can vary depending on the severity of the hernia.
How is a hiatal hernia diagnosed in dogs? 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, X-rays, and endoscopyEndoscopy is a diagnostic procedure that uses an endoscope (a thin, flexible tube with a light source and a camera at the end) to examine and visualize the inside of the body, often for diagnostic or therapeutic purposes.. These procedures help visualize the displacement of the stomach and rule out other possible causes of the symptoms.
What treatment options are available for a hiatal hernia? Treatment can be conservative or surgical. Conservative treatments include nutritional 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. and medications to reduce stomach acid. In severe cases or if conservative treatment is not successful, surgery may be necessary.
Can hiatal hernias in dogs heal on their own? In most cases, hiatal hernias do not heal on their own. Treatment is necessary to relieve symptoms and prevent complications such as stomach 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. or damage. Early veterinary care is important.
Are there risk factors for developing a hiatal hernia in dogs? Certain dog breeds may be more susceptible to hiatal hernias. These often include breeds with short noses such as pugs and bulldogs. Older dogs and overweight animals may also be at higher risk.
How can I help my dog with a hiatal hernia? An adapted diet can help relieve the symptoms. Small, frequent meals and avoiding stressful situations can also be beneficial. It is important to follow the veterinarian’s instructions carefully.
Can a hiatal hernia affect my dog’s life expectancy? If the hernia is diagnosed and treated in time, many dogs have a good 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.. Without treatment, however, complications can occur that can affect the quality and life expectancy.
How common is a hiatal hernia in dogs? Hiatal hernias are not very common in dogs, but they do occur. The exact frequency is difficult to determine because many cases may not be diagnosed if the symptoms are mild.
Are there preventive measures against hiatal hernias? There are no specific preventive measures to completely prevent a hiatal hernia. However, a healthy diet and weight control, as well as regular veterinary check-ups, can help reduce the risk and detect problems early.

When to visit the vet?

Non-urgent see a veterinarian within 2–3 days

If the condition worsens / symptoms persist, consult a veterinarian.