I just posted this for someone else.
http://www.petmd.com/dog/conditions/...x#.Us2Y8bQuQng. Here's what the basic article says, use the link to read more:Gastroesophageal Reflux in Dogs
Gastroesophageal reflux is a condition characterized by the uncontrollable reverse flow of gastric or intestinal fluids into the tube connecting the throat and the stomach (esophagus). This may be due to a brief relaxation of the muscular opening at the base of the esophagus (referred to as the sphincter), as well as chronic vomiting. Gastroesophageal reflux is fairly common in dogs, and may occur at any age, although younger dogs are at greater risk.
The gastric stomach acid, pepsin, bile salts, and other components of the gastrointestinal juices cause damage to the protective mucus lining the esophagus. This can result in inflammation of the esophagus (esophagitis).
The condition or disease described in this medical article can affect both dogs and cats. If you would like to learn more about how this disease affects cats, please visit this page in the PetMD health library.