Several different dental issues might present itself by causing your dog to constantly swallow. Dental issues such as an abscess or tumor could be behind your dog constantly swallowing. Other issues such as burns inside of the mouth, often due to biting on something with an electrical current, also might be to blame.

Why does my dog keep swallowing and gulping?

If your dog is doing more swallowing than licking, esophagitis may prove the culprit. That's inflammation of the esophagus, and it's often caused by acid reflux. ... Other esophagitis indicators include poor appetite, increased mouth secretions, and neck pain. Dogs with esophagitis may often regurgitate food.

What does acid reflux look like in dogs?

Here are other signs of acid reflux in dogs:

Grinding their teeth or snapping their jaw. Painful swallowing (they may cry or whine) Regurgitation of their food. Weight loss.