Eating or drinking. Whenever dogs eat or drink, they also swallow some air which can lead to burping. Some dogs burp more than others after eating and drinking and this may be affected by the way they eat, including if they eat too fast, and the type of food they are eating.
Discover why your dog burps after eating and what it means.After a while he threw up, but the gulping/licking has not stopped. He also went outside and was desperately trying to eat as much grass as possible, and i know thats a sign of stomach upset.
Dog burping is a natural body process much like it is in humans. It happens when the body is trying to get rid of excess air that has become stuck in the digestive tract. The esophageal sphincter at the top of their stomachs relaxes, allowing excess gas to leave, resulting in an often audible burp.

Dogs burp when there is excess gas in the stomach that needs to escape. Excess gas in your dogs stomach can arise from swallowing air while eating and drinking (known as aerophagia), or from the gas produced from digestion inside the GI tract, or in the bloodstream.
Eating grass can be a way for dogs to soothe an upset stomach, but it can also be a habit. If your dog is frequently eating grass and then burping or vomiting, they may have a digestive issue that needs veterinary attention. How else do dogs show affection?

Why Dog Burping Happens. There are some dogs that burp because theyre allergic to their food. You might want to consider talking to your vet about having your dog tested for allergies, and change his routine if necessary.
Brachycephalic dogs (flat-faced dogs): Dogs, such as Pugs and French Bulldogs, may be more prone to burping, as they may consume more air when eating. Food allergies: If your dog has a food allergy or food sensitivity and is consuming that food, this can cause burping.