Dog Hiccuping And Licking Lips. The yawning and lip licking may be caused by a loose tooth, fractured tooth or abscess. Some dogs will also smack their lips or drool excessively when they feel nauseous the dog may offer an appeasement gesture by licking his lips and averting his gaze.
There is something in the diet causing this. This behaviour can be demonstrated with both other dogs and people. Acid reflux in dogs occurs due to factors such as:
