Canine megaesophagus (ME) management is multimodal and primarily palliative, centered on elevated feeding, dietary modification, aspiration pneumonia prevention, and treatment of any identified underlying cause. Reported median survival times range from 1 to 3 months with an overall fatality rate of 74%, though individual outcomes vary substantially based on etiology and owner commitment.American Journa…+1

Elevated feeding is the cornerstone of management. Upright positioning during and after meals — using a Bailey chair or equivalent — reduces esophageal retention of ingesta and subsequent regurgitation.Journal of the… The optimal food consistency (liquid, soft, or solid) differs by individual dog, and determining the best regimen may require a period of trial and adjustment.Journal of the… Treatment success is defined as weight gain, reduced regurgitation frequency, and improved owner-perceived quality of life.Journal of the…

Identifying and treating an underlying cause is the highest-yield intervention when one exists. Acquired ME is associated with myasthenia gravis, hypoadrenocorticism, systemic myopathies, dysautonomia, lead toxicity, severe esophagitis, and systemic lupus erythematosus.BMC Veterinary… Myasthenia gravis carries a 50% response rate to treatment.Journal of Vete… Anti-acetylcholinesterase therapy is the relevant intervention for myasthenia gravis-associated ME; a positive serum anti-acetylcholine receptor antibody titer (reference limit < 0.6 mmol/L) confirms the diagnosis.Journal of the…

Sildenafil, a phosphodiesterase-5 inhibitor, is used to relax the gastroesophageal sphincter (GES) and facilitate gastric emptying of esophageal contents. Liquid sildenafil at 1 mg/kg has been evaluated in dogs with ME and was well tolerated, with owner-reported reductions in regurgitation frequency and improvements in weight gain.American Journa…+1 Maximum GES relaxation occurs approximately 10 minutes after administration and lasts approximately 1 hour.American Journa… Sildenafil has not demonstrated short-term benefit in ME secondary to demyelinating polyneuropathy, suggesting efficacy may be etiology-dependent.Journal of Vete… Metoclopramide and cisapride are ineffective for ME and can aggravate clinical signs.Journal of Vete…

Bethanechol has been used as a prokinetic to increase esophageal contraction amplitude, but clinically relevant improvement has not been demonstrated in reported cases, potentially reflecting etiology-specific differences in response.Journal of Vete…

A subpopulation of dogs with ME has lower esophageal sphincter achalasia-like syndrome (LES-AS), which may respond to targeted intervention. LES-AS is identified by videofluoroscopic swallow study (VFSS) using a free-feeding protocol; 19 of 130 dogs undergoing VFSS were identified with LES-AS, of whom 73.7% had concurrent ME.Journal of Vete… VFSS findings include a baseline esophageal fluid-line in 68.4% and a "bird beak" sign in 63.2% of affected dogs.Journal of Vete… Targeted interventions for LES-AS include mechanical dilation, botulinum toxin A injection into the LES, and surgical myotomy with fundoplication.Journal of Vete… These interventions are not appropriate for dogs with generalized idiopathic ME without functional LES obstruction.

Esophageal suctioning via esophagostomy tube is reserved for dogs with recurrent aspiration pneumonia that persists despite gastrostomy tube feeding. After initiation of intermittent esophageal suctioning, dogs survived a median of 13.5 additional months (range 10–30 months); 2 of 4 dogs had no further aspiration pneumonia episodes.Journal of Vete… Complications include esophagostomy tube clogging, esophagostomy site infections, and esophagitis.Journal of Vete… A combined approach using an esophagostomy tube for suctioning and an esophagogastric tube for nutrition has also been reported, reducing regurgitation frequency from 2.4 to 0.1 episodes per day and increasing body weight from 18.5 to 27.9 kg in one dog surviving 951 days; necropsy identified a 2.5 cm gastric ulcer attributed to tube-induced injury.Journal of Vete…

Esophagoscopy should be performed in dogs that fail to improve on medical management or suffer an exacerbation of previously controlled signs, to evaluate for esophageal candidiasis. Candida albicans esophagitis presents as diffuse white fungal plaques on esophagoscopy with yeast structures on brush cytology, and responds to fluconazole treatment.Journal of Vete… Esophageal candidiasis can exacerbate weight loss and malnutrition already present in ME patients.Journal of Vete…

Aspiration pneumonia is managed with appropriate antimicrobials — amoxicillin-clavulanate is one reported option — and omeprazole is used for concurrent esophagitis.BMC Veterinary…

Owner quality of life is a critical management variable. The top owner-reported negative impacts include concern about weight loss (mean item-weighted impact score –6.7 ± 1.39), inability to give treats (–5.64 ± 0.41), schedule disruption (–5.11 ± 1.38), inability to board the pet (–5.00 ± 1.44), and required social life adaptation (–4.34 ± 1.40), with an overall average-weighted impact score of –2.47.Journal of the… Management burden is a leading driver of euthanasia, and tailoring the treatment plan to owner capacity directly affects patient survival.Journal of the…+1

Would you like to go deeper on the workup for identifying a treatable underlying cause — specifically the diagnostic sequence for ruling out myasthenia gravis, hypoadrenocorticism, and other secondary causes?