When a dog licks its lips, many owners assume the animal is hungry. But that assumption can be misleading. Experts point to several other reasons for this behavior.
A dog licking its lips can be a sign of discomfort or illness. Often it indicates stress or pain, the Daily Mail reports.
Many owners assume lip-licking means hunger or that something is stuck in the teeth. British pet behavior expert Matt Kales says it more often signals stress or discomfort.
Animal psychologists say lip licking is one of the most common ways dogs show anxiety. You often see it during vet visits, in noisy environments, or when a dog meets strangers.
Dogs Trust, a UK charity, says dogs often lick their lips after eating or drinking, which is normal. The charity adds that excessive lip-licking or drooling can point to nausea or pain, particularly dental pain.
Dogs Trust experts also say lip licking can be a sign of dry mouth caused by stress or anxiety. “If you notice this, give your dog some space and consult a veterinarian or a qualified animal behaviorist,” they advise.
PetMD warns that dogs who have been running in the sun may lick their mouths because they’re thirsty. In severe cases, prolonged mouth-licking could indicate dehydration.

Pay Attention to Your Dog’s Behavior
At the end of a long day, puppies may smack their lips and lick their mouths as they settle into bed and drift off to sleep. Animal psychologists say this behavior is a self-soothing mechanism. Your dog is seeking comfort, so there’s usually no need to worry.
To help your dog stay calm and well-adjusted, speak softly and avoid looming over them. Give them space during stressful encounters. Keep a consistent daily routine.
Mr. Kales said, “Your dog’s body language is its voice. Lip licking isn’t a quirk; it’s a clue.” People need to learn what those signals mean.
In summary, here are the reasons why a dog may lick its lips:
- Stress
- Anxiety
- Dental issues
- Drooling
- Thirst or dehydration
- Nausea
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