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Dogs vomit occasionally for a variety of relatively benign reasons – to expel something unwanted from their stomach, as a result of gastric irritation or in response to colonic stimulus, for example. Prolonged, unrelenting vomiting or regurgitation, however, can be the sign of a serious condition, anything from head trauma or toxin exposure to pancreatic cancer or gastrointestinal obstruction.
What To Watch For
Dogs drool, lick their lips, and swallow excessively just before vomiting or when they feel nauseous. Some may eat grass, possibly to relieve gastric irritation or serve as self-induced emetic.
It is important to distinguish between vomiting and regurgitation -- the latter happens spontaneously, raising undigested food with no abdominal effort. Usually, this is a sign of esophageal issues or other problems occurring early on in the digestive process. Regurgitation should not be classified with vomiting as a different range of possible causes are associated with regurgitation.