You hear it from the sofa — that soft, repeated flick of the tongue. Your dog is licking the air, over and over, though there is nothing there to lick. Once is funny; every day is worrying. Occasional air licking is normal, but constant air licking almost always has an underlying cause. This guide covers the most common possible reasons. It is not a diagnosis — only a vet who examines your dog can say what is really going on.
What Air Licking Actually Looks Like
Air licking is when a dog repeatedly sticks out its tongue and licks the air, as if catching something invisible. It can last a few seconds or several minutes, and some dogs smack their lips at the same time.
Some dogs do it after eating, some late at night or early in the morning, some when excited, nervous, or bored. That pattern matters — a dog that licks the air once after a walk is probably just sampling a smell, while a dog that does it every morning before breakfast is showing you a pattern. Note when it happens and whether your dog drools or licks its lips too.
1. Nausea Is the Most Common Cause
When a dog feels sick to its stomach, it often produces extra saliva, and licking the air, smacking the lips, and swallowing over and over can be its way of dealing with it.
Nausea can have many possible causes: acid reflux, gastritis, pancreatitis, or an empty stomach, when acid builds up with no food to absorb it. Owners often notice a timing clue — the licking is worse early in the morning or late at night, after many hours without food.
Watch for drooling, eating grass, turning away from food, or vomiting. A dog that vomits yellow liquid in the morning may be dealing with bile on an empty stomach — read more about why your dog may be throwing up yellow. Never give human stomach medicine unless your vet tells you to.
2. Something Is Wrong in the Mouth
Sometimes the problem is in the mouth, not the stomach. A sore or cracked tooth, sore gums, or a foreign object stuck between the teeth — a piece of stick or a bone fragment — can make a dog lick the air again and again.
Look gently for signs of a sore mouth: chewing on one side only, dropping food, pulling away when you touch its face, or bad breath that is new or much worse. Regular brushing and dental chews approved by your vet can help — see our guide on how to brush a dog’s teeth at home. But if your dog is already in pain, do not poke around in its mouth yourself.
3. Anxiety, Stress, and Compulsive Behaviour
Licking can be a self-soothing behaviour — the repeated movement can be calming and may even release endorphins, the body’s natural “feel good” chemicals. A behaviour that started as a way to cope with one stressful moment can become a habit.
Think about when your dog licks the air — during thunderstorms or fireworks, when visitors come over, when you pick up your keys, or when left alone or bored? Anxious dogs may also pace, pant, yawn a lot, or hide. If your dog follows you everywhere, our article on why your dog follows you everywhere and separation anxiety signs may help.
A calm, predictable routine helps. Do not scold your dog for licking — punishment adds stress and can make it worse. If the licking seems compulsive, talk to your vet.
4. Skin Irritation It Cannot Reach
A dog that is itchy somewhere it cannot reach — on its back, its belly, or inside its ears — may lick the air out of frustration. Skin irritation can come from dry skin, allergies, fleas, or a mild rash. If your dog is also scratching a lot, biting at its paws, or shaking its head, the skin or ears may be part of the story.
Check your dog’s skin for redness or flaky patches, and inside the ears for redness or a strong smell. If your dog licks its paws a lot too, read our guide on why your dog keeps licking its paws — the two behaviours often share the same causes. Do not use human creams or shampoos on your dog without your vet’s advice.
5. Gut Problems Beyond Simple Nausea
The gut can be involved in other ways too. Conditions such as irritable bowel syndrome (IBS), a foreign object swallowed and stuck in the gut, or an infection such as giardia can all leave a dog feeling unwell and showing signs like air licking, lip licking, and extra swallowing.
With gut problems, you will often see other signs alongside the licking: soft stools or diarrhoea, a change in appetite, weight loss, or discomfort after eating. Some dogs with gut discomfort also eat grass or lick the floor — our article on why your dog licks the floor constantly explains the overlap. Note any changes in eating and toilet habits, and share them with your vet.
6. Normal Scent Sampling — The Flehmen Response
Not every case of air licking is a problem. Dogs have a special scent organ called the vomeronasal organ, also known as Jacobson’s organ, on the roof of the mouth. When a dog licks the air, flicks its tongue, or curls its lip, it can push scent particles towards that organ. This is called the Flehmen response, and it helps the dog pick up detailed information about a smell.
You will often see this on a walk, when your dog catches an interesting smell. The licking is usually brief, the dog looks curious rather than worried, and it stops on its own. Normal scent licking is short and occasional; problem licking is frequent, long-lasting, and often happens at home with no new smell around.
7. Cognitive Dysfunction in Senior Dogs
Older dogs can develop canine cognitive dysfunction, a condition similar in some ways to dementia in people. It affects memory, awareness, and behaviour, and it can show up in small, strange ways — including repetitive behaviours like air licking.
A senior dog with cognitive dysfunction may also seem confused, stare at walls, get stuck in corners, forget house training, or sleep much more during the day and wander at night. The changes usually come on slowly, over weeks or months.
If your dog is older — usually over eight — and the air licking started with other behaviour changes, mention this to your vet.
8. Focal or Partial Seizures
This is the least common cause on this list, but it is important to know about. In a focal seizure, also called a partial seizure, only one part of the brain is affected. Instead of full-body shaking, a dog may show small, repeated movements — licking of the air, lip smacking, chewing movements, or twitching in one part of the face.
These episodes are usually brief, lasting seconds to a minute or two, and the dog may seem confused afterwards. You cannot diagnose this at home. But if the air licking comes in sudden episodes that look the same every time, and your dog seems unaware of you during it, take a video if you can do so safely and show it to your vet.
9. Lip Licking and Air Licking Often Go Together
Air licking rarely happens on its own. Many dogs smack their lips, lick their lips, swallow hard, or drool at the same time. That cluster points more strongly towards nausea or mouth discomfort than towards a simple habit.
Lip licking on its own can have many possible causes, from a tasty smell to nervousness to nausea. Our article on why your dog keeps licking his lips covers the nine most common reasons, and many overlap with the causes of air licking. Look at the whole picture: air licking plus lip licking plus drooling plus refusing food is a different picture from air licking alone after a sniff on a walk.
What to Watch For: A Simple Checklist
Before you call your vet, keep clear notes for three or four days: when does it happen, how long does it last, and how often? What else is happening — drooling, vomiting, or a change in appetite? What changed recently — a new food, treat, or medicine? Bring your notes — and a video, if you have one — to the vet appointment.
What NOT to Do
Do not scold or punish your dog for licking the air. Your dog is not being naughty — if the cause is nausea, pain, or anxiety, punishment only adds stress and will not stop the underlying problem.
Do not hold your dog’s mouth shut or try to stop the tongue with your hand — this can frighten your dog, and if your dog is having a seizure or is in pain, it could lead to a bite. Do not give your dog human medicines unless your vet tells you to — many are unsafe for dogs.
Do not look deep into your dog’s mouth or throat yourself, or pull out something you think is stuck — call your vet instead. Do not suddenly change your dog’s food, and do not use home remedies you find online without checking with your vet first.
When to See a Vet
Book a vet appointment soon — within a day or two — if your dog licks the air constantly or every day, even with no other signs. Constant licking almost always has an underlying cause.
See a vet urgently, the same day, if air licking comes with heavy drooling, vomiting or retching, reduced appetite, breathing difficulty, collapse or weakness, disorientation, seizure-like activity such as shaking or twitching, or blood in vomit or stools.
If you are ever unsure, call your vet and describe what you see. At the appointment, your vet may examine the mouth, belly, skin, and ears, and may suggest blood or stool tests. Bring your notes and video.
FAQ
Is it normal for dogs to lick the air sometimes?
Yes. Occasional air licking is normal. Dogs use their tongue to push scents towards the vomeronasal organ, also called Jacobson’s organ — this is called the Flehmen response. A few seconds of air licking after sniffing something interesting is usually nothing to worry about. It becomes a concern when the licking is constant, repetitive, or happens every day with no clear trigger.
Why does my dog lick the air at night or early in the morning?
Licking that is worse late at night or early in the morning may be linked to nausea on an empty stomach. When a dog has not eaten for many hours, stomach acid can build up with no food to absorb it, so the discomfort is worst before breakfast or bedtime. If the pattern is regular, tell your vet — the timing is a useful clue.
Can anxiety cause a dog to lick the air?
Yes. Licking can be a self-soothing behaviour — the repeated movement may release endorphins that help a dog feel calmer. Dogs may lick the air when nervous, bored, or overexcited, and over time it can become a habit. If the behaviour is compulsive, talk to your vet.
Should I stop my dog from licking the air?
Do not scold your dog or force its mouth shut — that will not fix the cause and may add stress. Gently distract your dog with a calm activity, and focus on finding the cause. If the licking is constant, keep notes, take a video, and book a vet visit.
When should I worry about my dog licking the air?
See a vet soon if the licking is constant or daily, lasts several minutes at a time, is getting worse, or comes with drooling, vomiting, reduced appetite, coughing, confusion, or seizure-like movements. See a vet urgently the same day if your dog has breathing difficulty, collapses, or seems disorientated.
Conclusion
Air licking looks small and a little funny at first — a flick of the tongue, a funny face, and then your dog carries on as normal. Most of the time, that is all it is: a dog sampling a smell, or a brief moment of curiosity.
But when it happens again and again, day after day, it is worth paying attention to. In most cases there is an underlying cause, and nausea is the most common one. A sore mouth, stress, skin irritation, gut problems, changes in an older dog, or, more rarely, a focal seizure, are all possible causes too.
You know your dog better than anyone. Keep simple notes, take a short video if you can, and book a vet visit if the licking is constant or comes with other worrying signs. Your dog cannot tell you in words that its stomach hurts — air licking may be the closest it can come to saying so.