The reasons why dogs hiccup and vomit:

1. Due to viral infection such as parvovirus, dogs have persistent vomiting, hiccups and diarrhea.

2. Since the foreign body cannot be absorbed, the dog will have severe intestinal blockage, causing the dog to burp and vomit.

3. Ulcers appear in the stomach, which reduces the dog’s ability to digest food and causes the dog to burp and vomit.

4. If the dog has intestinal parasites, it may cause hiccups and vomiting in severe cases.

5. It may be caused by the dog eating too much at one time, so just fast.