A dog that vomits after eating may be caused by improper diet, gastrointestinal disease or food poisoning. You need to observe the dog's mental state. If it is not in good spirits, it is best to take it to the hospital for examination. Avoid delaying the condition. If your dog has no other reaction after vomiting, then nothing is wrong. You need to pay special attention when feeding your dog. There are many foods that dogs cannot eat. Try not to feed your dog random food.