Occasionally a dog may vomit if they have eaten something disagreeable or eaten too much food too fast. However, vomiting can also indicate diseases that require immediate medical attention such as foreign bodies (toys, bones, household objects etc.), intestinal parasites, viral or bacterial infections, kidney disease, liver disease, gastroenteritis (inflammation of the gastrointestinal tract), pancreatitis (inflammation of the pancreas), dietary intolerance, ingestion of a toxic substance, infected uterus, severe diabetes, heat stroke, and cancer. An isolated bout of vomiting may not be of concern. However, if it is not an isolated incident (occurs more than once in a day, vomiting persists beyond the one day, or vomiting has been occurring occasionally over an extended period of time), then they should be evaluated by a Veterinarian right away. Also, they should be evaluated by a Veterinarian if other clinical signs accompany vomiting exist such as increased water intake and/or urinations, weight loss, diarrhea, discontinuation of bowel movements, loss of appetite, bloating, blood in the vomit, dehydration, or lethargy. Eating grass is often a sign that your dog is not feeling well and is nauseous therefore vomiting after eating grass should also be considered as a potential problem.