When you come home to find a mess on the floor, it is easy to assume that the dog vomited. Vomiting is very common in dogs, as they often eat weird things! There are actually many other causes of vomiting, including parasites, kidney disease, liver problems, pancreatitis, and food allergies. Overall, there are probably at least 101 causes of vomiting.
When you take your dog to the veterinarian, the doctor will ask questions and determine if the dog is truly vomiting, or if the dog really has regurgitation, because they have different causes. You will be asked if you saw the process and what the mess looked like.