What is MegaEsophagus?

It's an enlargement of the esophagus that disallows the proper entry of food into the stomach. In a nornal esophagus, muscles cause the food to be pushed down through our digestive tract. With megaesophagus, the muscle has lost it's tone, remains enlarged, and does not function properly. It often leads to ill digestion, regurgitation and aspiration of food into the lungs. It's more common in large-breed dogs.

That's a pretty "impressive" case. I have only seen one as bad in my five years in veterinary medicine, and that was in an Akita. It was manageable for her, and I'm glad your Pup doesn't suffer from any additional ailments.