By Green Dog Pet Supply “Megaesophagus is a condition in which a dog’s esophagus is enlarged to the point that food remains in the esophagus and never makes it down to the stomach and is instead regurgitated. The muscle contraction and relaxation that normally takes place to move food down to the stomach doesn’t work. Megaesophagus can be present since birth or can develop in adult dogs. If left untreated, it can cause a range of problems, including starvation and aspiration pneumonia.” This quote was extracted from a site