Outpouchings of the Esophageal Wall in Dogs (Esophageal Diverticulum)

  • Synonyms: Esophageal diverticulum, gullet diverticulum
  • Occurrence: rarer
  • Location of disease: Chest
Author: Dr. med. vet. Gisa Löwe | Last modified: 21.08.2026
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When to visit the vet?

Non-urgent see a veterinarian within 2–3 days

?

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

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Definition

Esophageal diverticula in dogs are outpouchings or protrusions of the esophageal wall that can lead to swallowing dysfunction and food accumulation.

The most important facts at a glance

Esophageal diverticula in dogs are muscle-poor outpouchings of the esophagus that can collect food and liquid. These can be congenital or acquired and are rare. Congenital diverticula often result from developmental disorders, while acquired ones can be caused by chronic pressure, inflammatory conditions, or traumas. Symptoms include regurgitation of undigested food, swallowing difficulties, increased salivation, loss of appetite, coughing, and weight loss. Diagnosis is made through clinical examination, X-ray images with contrast agent, and possibly endoscopy or advanced imaging such as CT or MRI.

Treatment depends on the severity and symptoms. Small, asymptomatic diverticula often do not require surgery, while severe cases may necessitate surgical removal. Intensive aftercare is important post-surgery, including an adapted diet and, if necessary, medication. The prognosis varies depending on the cause and size of the diverticulum. Small, asymptomatic diverticula often have a good prognosis, whereas large or complex diverticula, especially with aspiration pneumonia, can have a guarded to poor prognosis.

Prevention is difficult, as the causes are diverse. Appropriate nutrition and avoiding chronic vomiting or reflux can be helpful. Regular veterinary examinations are important to detect anomalies early. For genetically predisposed breeds, genetic counseling could be useful.

Causes

The esophagus is a muscular tube that transports food from the throat to the stomach. In a diverticulum, a muscle-poor pouch forms that can collect food and liquid. This anatomical anomaly can be congenital or acquired and is relatively rare in veterinary medicine.

The causes of esophageal diverticula are diverse. Congenital diverticula often result from a developmental disorder during embryogenesis. Acquired diverticula can develop due to chronic pressure within the esophagus, inflammatory conditions, or as a result of traumas. Chronic inflammatory conditions, such as those caused by reflux esophagitis, or a foreign body stuck in the esophagus, can also contribute to the formation of diverticula.

Another possible factor is dysfunction of the lower esophageal sphincter, which can lead to increased pressure on the esophagus and thus to outpouching. Genetic factors could also play a role, especially in breed predispositions, which have not yet been conclusively researched.

Symptoms

Rare symptoms:

The symptoms of an esophageal diverticulum in dogs can vary depending on the size and location of the diverticulum. Common signs include regurgitation, the involuntary bringing up of food, which often occurs shortly after eating. This differs from vomiting, as it is not an active process and the food flows back undigested.

Other symptoms include coughing, especially after eating, increased salivation, and swallowing difficulties. Some dogs show general signs of discomfort, such as loss of appetite or weight loss, as food intake is disrupted. In severe cases, aspiration pneumonia can occur when food particles or liquid enter the lungs.

Therapy

The treatment of esophageal diverticula in dogs depends on the severity of the condition and the symptoms. Small, asymptomatic diverticula can often be monitored without surgical intervention. In symptomatic cases, a change in diet can help, for example, by reducing the amount of food and increasing the frequency of meals to reduce pressure on the esophagus.

In more severe cases or if complications such as aspiration pneumonia occur, surgical removal of the diverticulum may be necessary. This operation requires careful planning and execution, as the esophagus is a difficult surgical field and the risk of postoperative complications is high.

Intensive aftercare is required after surgery, including an adapted diet and possibly medication to reduce inflammatory conditions and support healing. Antibiotics may be necessary to prevent or treat infections.

Prognosis and follow-up care

The prognosis for dogs with esophageal diverticulum varies depending on the cause, size, and location of the diverticulum as well as the dog’s overall health. For small, asymptomatic diverticula, the prognosis is generally good, especially if no complications occur.

Dogs that have received successful surgical treatment also have a good prognosis, although the risk of complications such as scar tissue formation or infections exists. Unfortunately, the prognosis for dogs with large or complex diverticula, especially if they are affected by aspiration pneumonia, can range from guarded to poor.

Prevention

Since the causes of esophageal diverticula are diverse, specific prevention measures are limited. Ensuring adequate nutrition and avoiding situations that could lead to chronic Vomiting or reflux can be helpful. Since some diverticula are congenital, prevention is not possible in these cases.

Regular veterinary examinations can help detect anomalies early and treat them in a timely manner. For breeds that may be genetically predisposed, genetic counseling could be useful to minimize the risk of transmission to offspring.

Overall, maintaining a healthy environment and avoiding stress factors that could impair the dog’s digestion are important to reduce the risk of esophageal problems.

Outlook on current research

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The esophageal diverticulum is a sac-like outpouching of the esophageal wall. It can occur in the upper area, such as a Zenker diverticulum, or further down. Clinically, swallowing difficulties, regurgitation, coughing, and in unfavorable cases aspirations are usually prominent. Modern research increasingly views the diverticulum less as a pure “structural problem” and more as a consequence of a functional disorder of the esophagus, primarily pressure and motility problems. (ncbi.nlm.nih.gov, pubmed.ncbi.nlm.nih.gov)

A central research field is therefore improved functional diagnostics. High-resolution manometry, endoscopy, and more precise imaging are intended to clarify which motility disorder underlies the diverticulum and why some patients have primarily local mechanical complaints while others have more complex motility-related complaints. This is important because it determines the optimal therapy. (pubmed.ncbi.nlm.nih.gov, ncbi.nlm.nih.gov)

The greatest therapeutic progress currently lies in minimally invasive endoscopic procedures. Especially for Zenker’s diverticula, techniques such as endoscopic septotomy and Z-POEM are gaining importance because they are often less invasive than open surgeries. Current research primarily investigates for whom endoscopic procedures are equally reliable long-term and how recurrences can be further reduced. (pubmed.ncbi.nlm.nih.gov, pubmed.ncbi.nlm.nih.gov)

Overall, the outlook is good: development is clearly moving toward function-oriented diagnostics and individually selected, gentle therapy.

Frequently Asked Questions (FAQs)

1. What is an esophageal diverticulum?
An esophageal diverticulum is a sac-like outpouching of the esophageal wall. A distinction is made between traction diverticula, which are caused by external pulling, and pulsion diverticula, which are formed by increased internal pressure at a weak point in the wall. Food residues can accumulate in the outpouching and cause discomfort.
2. Where do diverticula typically occur?
Diverticula most commonly occur in the area of the thoracic aperture, in front of the diaphragm, or in the cervical portion of the esophagus. The exact location depends on the cause. Congenital forms are rare and are found more in the cranial third, acquired ones mostly in the caudal portion.
3. What symptoms does an affected dog show?
Typical signs are regurgitation of undigested food (also delayed after eating), gagging, coughing, respiratory distress, bad breath, and weight loss. Large diverticula lead to swallowing difficulties and occasionally to aspiration pneumonia when food enters the airways.
4. How is the diagnosis made?
Contrast radiographs of the esophagus with barium are the most important diagnostic tool. They show the outpouching, its location, size, and the transition to the normal esophagus. Endoscopy allows direct assessment of the mucosa, detection of food retention, and biopsy collection.
5. What are the causes of acquired diverticula?
Chronic esophagitis, stenosis, foreign bodies, persistent aortic arch, and motility disorders lead to increased intraesophageal pressure and thus to pulsion diverticula. Traction diverticula are caused by inflammatory processes in the mediastinum or lungs that pull the esophageal wall outward.
6. How are diverticula treated?
Small, low-symptom diverticula can be treated conservatively: small, frequent meals with soft food from an elevated position, acid blockers, and prokinetics. Large, symptomatic diverticula with food retention require surgical resection of the outpouching, which is technically demanding.
7. What role does feeding position play?
Feeding from an elevated position, where the dog sits upright and remains in this position for a few minutes afterward, facilitates passage through the esophagus and reduces accumulation in the outpouching. A Bailey chair position is particularly helpful for large diverticula and megaesophagus.
8. What complications are possible?
The most dangerous complication is aspiration pneumonia, as food residues from the diverticulum can enter the airways. Other complications include chronic esophagitis, perforation with mediastinitis, and malnutrition. Regular monitoring is therefore important.
9. What is the prognosis after surgery?
The prognosis after resection of a diverticulum is good to fair, depending on location, size, and underlying cause. The operation is technically demanding, complications such as suture failure are possible. In experienced centers, most dogs achieve significantly better quality of life.
10. Can diverticula be congenital?
Yes, but congenital diverticula are rare. They usually become symptomatic in the first months or years of life. In young dogs with chronic regurgitation and no other identifiable cause, this possibility should be considered.

Literature

  • Pearson, H., Gibbs, C., & Kelly, D. F. (1978). Oesophageal diverticulum formation in the dog. Journal of Small Animal Practice, 19(6), 341–355. https://doi.org/10.1111/j.1748-5827.1978.tb05503.x
  • Hill, F. W. G., Christie, B. A., Reynolds, W. T., & Lavelle, R. B. (1979). An oesophageal diverticulum in a dog. Australian Veterinary Journal, 55(4), 184–187. https://doi.org/10.1111/j.1751-0813.1979.tb15275.x
  • Park, H. A., Kim, J. W., & Park, H. M. (2012). Characteristics of esophageal diverticula using computed tomography and three-dimensional reconstruction in a Maltese dog. Journal of Veterinary Medical Science, 74(9), 1233–1236. https://doi.org/10.1292/jvms.11-0546
  • Oliveira, T. N. A., Veloso, J. F., Rocha, P. S., Lacerda, P. D., & Carlos, R. S. A. (2018). Esophageal diverticulum and megaesophagus in a dog and a cat. Acta Scientiae Veterinariae, 46(Suppl. 1), Article 249. https://doi.org/10.22456/1679-9216.85114
  • Pollard, R. E. (2012). Imaging evaluation of dogs and cats with dysphagia. ISRN Veterinary Science, 2012, Article 238505. https://doi.org/10.5402/2012/238505
  • Defarges, A. (2025). Esophageal diverticula in small animals. In MSD Veterinary Manual. Reviewed/Revised October 2022, modified May 2025.