Hiatal Hernia in Dogs

Overview of Canine Hiatal Hernia

A hiatal hernia is the protrusion of abdominal contents into the thoracic or chest cavity through the esophageal hiatus, which is the natural opening in the diaphragm that allows the passage of the esophagus. These hernias may be persistent or intermittent.

Hiatal hernias occur in both dogs and cats, and males seem to be predisposed. Chinese shar-peis tend to have a higher incidence than other breeds.

Causes of Hiatal Hernias in Dogs

• Congenital (present since birth)
• Traumatic
• Gastroesophageal reflux, which is the backward flow of stomach contents up and into the esophagus. Reflux often accompanies hiatal hernias and results in subsequent esophagitis or inflammation of the esophagus.

What to Watch For

• Vomiting
• Excessive drooling
• Vomiting blood
• Difficulty breathing
• Regurgitation, which is the effortless evacuation of fluid, mucus, and undigested food from the esophagus

Diagnosis of Hiatal Hernias in Dogs

Baseline tests to include a complete blood count (CBC), biochemical profile, and urinalysis are recommended in all patients, and are often within normal limits.

More specific tests include:

• Radiographs (x-rays) of the thorax (chest) and abdomen generally support a dilated esophagus, and may help rule out secondary aspiration pneumonia. Normal radiographs do not rule out a hiatal hernia.
• Esophagram (barium swallow)
• Fluoroscopy (a radiographic evaluation that assesses the esophagus in motion)
• Endoscopy/esophagoscopy is a procedure that allows visual inspection of the esophagus

Treatment of Hiatal Hernias in Dogs

It is most important to determine whether the dog’s condition warrants admission to the hospital for treatment, or treatment at home as an outpatient. Treatment is important, as untreated animals are predisposed to developing chronic esophagitis with mucosal (lining of the esophagus) ulceration, aspiration pneumonia, stricture (narrowing), and strangulation of abdominal organs.

Treatment in dogs typically involves:

• Fluid and electrolyte therapy, especially if they have concurrent aspiration pneumonia
• Nutritional support
• Antibiotic therapy in patients with concurrent pneumonia
• Low fat diet with elevated, frequent, small feedings
• Surgical intervention in some patients, especially in those that need to have their herniated abdominal organs replaced

The best initial approach is conservative medial treatment to control esophagitis and clinical signs. Drugs that decrease or inhibit acid production by the stomach such as Tagamet® (cimetidine), Pepcid® (famotidine), Zantac® (ranitidine), Cytotec® (misoprostol), and Prilosec® (omeprazole) encourage and expedite the resolution of gastroesophageal reflux and esophagitis.

Home Care of Dogs with Hiatal Hernias

Administer all medication and diet as directed by your veterinarian. If any change is noted in your dog’s condition, notify your veterinarian. In particular, if coughing or difficulty breathing is observed, contact your veterinarian at once, as this may signal aspiration pneumonia secondary to a malfunctioning esophagus.