Oh no! It’s very possible the poor guy has a tummyache. Maybe his prepared kibble is giving him some acid reflux? But, it could also be a hiatal hernia, which is a weakness of the diaphragm that allows a bubble from the stomach to come up into the chest cavity.
Humans with this have GERD – gastroesophageal reflux disease -- and are often given antacids, which have been linked to osteoporosis and malnutrition. Instead, I recommend a chiropractic adjustment. I recommend fixing the food yourself and getting your dog off of prepared store-bought kibble right away. Find some GREAT recipes that help you save money on your vet bills as well as your grocery bill at www.dinnerPAWsible.com. This will help the stomach acid act like its supposed to -- as long as there’s no ulcer -- to properly digest food.
Be sure to mention your dog’s behavior at your next visit!