Cause
There are numerous causes of vomiting. Some examples include motion sickness, drugs, and gastrointestinal tract obstruction which can occur when a dog swallows a foreign object like a golf ball. Inflammation of the gastrointestinal tract due to inflammatory bowel disease, parvovirus, and parasites frequently produces vomiting. Diseases of the kidneys, liver, pancreas,  and other vital organs, and even overeating may cause vomiting as well.