Regurgitation

Regurgitation is the passive regurgitation of undigested food or fluid from the oesophagus into the throat or mouth – and anyone who has observed it once in their dog recognises immediately: this is not ordinary vomiting. No retching, no warning signal, no abdominal muscle contractions. Exactly what makes the difference to vomiting so important – because the causes and treatment are fundamentally different.

Causes of regurgitation in dogs

When a dog regurgitates, there is almost always a disorder of the oesophagus behind it. The causes are diverse – here are the most common ones:

1. Megaesophagus: In adult dogs, the primary form is most frequently idiopathic, meaning without an identifiable cause; additionally, it occurs as a consequence of a systemic disease. With megaesophagus, the oesophagus is pathologically dilated and loses its transport function. The food gets stuck and is passively regurgitated again.
2. Oesophagitis (oesophageal inflammation): An inflammation of the oesophagus – often triggered by persistent acid reflux or swallowed foreign bodies – can irritate the sensitive mucous membrane so much that regurgitation is the result.
3. Oesophageal stricture: A narrowing of the oesophagus does not allow food to pass properly. What does not move on flows back – and ends up in the dog’s mouth sooner or later.
4. Foreign bodies in the oesophagus: A swallowed bone, a piece of toy, a twig – such objects can simply block the oesophagus and thus directly trigger regurgitation.
5. Congenital malformations: Some dogs are born with anatomical abnormalities of the oesophagus, for example a persistent right aortic arch. Such structural anomalies can permanently obstruct the food’s path to the stomach.
6. Myasthenia gravis: This autoimmune disease weakens the musculature – including that of the oesophagus – so strongly that food can no longer be transported into the stomach. Regurgitation is a classic accompanying symptom here.
7. Tumours or other space-occupying lesions: If a tumour grows in the area of the oesophagus, it can mechanically block the flow of food and cause regurgitation.

Symptoms of regurgitation in dogs

Sometimes it goes almost unnoticed, sometimes it is glaringly obvious. The typical signs you should look out for:

• Regurgitation of undigested food: The most characteristic feature of regurgitation is the shape of what comes up – often cylindrical or tubular, because the food has taken on the shape of the oesophagus. Undigested, barely changed.
• Dysphagia: The dog swallows with noticeable difficulty, eats very slowly or appears tense while eating.
• Coughing or breathing difficulties: If regurgitated material enters the trachea (aspiration), this can lead to coughing, shortness of breath or even a dangerous aspiration pneumonia.
• Weight loss: Those who repeatedly lose what they have eaten simply do not take in enough. Persistent regurgitation leads to weight loss and malnutrition.

Diagnosis of Regurgitation

Before treatment can begin, it must be clear what you are dealing with. The vet proceeds systematically:

1. Clinical history: It starts with a conversation. How does the dog eat? How often and when does food come back up? What does the regurgitated material look like? In many cases, this allows regurgitation to be distinguished from vomiting on clinical grounds alone.
2. X-ray examination: An X-ray of the chest can reveal changes such as megaesophagus, a stricture or an impacted foreign body.
3. Contrast X-ray (barium X-ray): In certain cases, the dog is given a contrast agent such as barium so that the flow of food along the oesophagus can be visually tracked and assessed.
4. Endoscopy: An endoscopy of the oesophagus allows inflammation, foreign bodies or tumour changes to be viewed directly.
5. Blood tests: Blood tests provide insight into the dog’s general health status and can specifically detect certain conditions – including myasthenia gravis.

Treatment of Regurgitation

There is no one-size-fits-all solution – treatment always depends on the underlying cause.

Management of megaesophagus:

• Frequent small meals are best for most dogs with megaesophagus. Feeding is done from an elevated position with the front legs higher than the hind legs, and this posture is maintained for at least 10 to 15 minutes after eating; ready-made chairs for this purpose have been available on the market for years.
• Which consistency is best tolerated varies from dog to dog.

Drug treatment:

• In cases of oesophagitis, H2 blockers such as ranitidine or famotidine are often sufficient; in severe cases, a proton pump inhibitor such as omeprazole is preferred.
• Cisapride and metoclopramide increase the resting tone of the oesophagus and accelerate gastric emptying. Broad-spectrum antibiotics are administered if aspiration pneumonia occurs simultaneously.

Surgical interventions:

• In cases of foreign bodies, strictures or congenital malformations, surgery is sometimes the only way to remove the blockage and restore function to the oesophagus.

Treatment of underlying conditions:

• If an autoimmune disease such as myasthenia gravis is behind the regurgitation, or if it is tumours, the underlying condition must be targeted specifically. Treating only the symptom will not get you very far.

Prevention of aspiration:

• Dogs that regurgitate regularly are at increased risk of aspiration pneumonia – food or liquid enters the lungs, which can become life-threatening. Careful feeding technique is therefore not a luxury but a genuine protective measure. In some cases, antibiotics are used as a precaution.

Prevention

Not every form of regurgitation can be prevented – that would be unrealistic. But there are some concrete measures that can significantly reduce the risk:

• Elevated feeding: Dogs with megaesophagus should generally eat from an elevated position so that gravity supports the flow of food into the stomach – even when there are no acute symptoms.
• Small portions, regularly: Frequent small meals are best for most dogs with megaesophagus.
• Consistently remove foreign objects: Small items that a dog could swallow – bones, toy parts, twigs – should be kept out of the dog’s reach. Sounds simple, but it is one of the most common avoidable triggers.