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Should you’ve ever taken your pup to the canine park, you’ve most likely seen it: two canine sniff hi there, then one dives in with a sloppy lick to the opposite’s mouth. Cue the awkward human laughs and some “ew, gross!” feedback.
However this isn’t doggy PDA gone improper. Mouth licking is without doubt one of the oldest, most versatile types of canine communication — half intuition, half affection, and typically nearly what the opposite canine had for lunch.
So why do canine lick one another’s mouths? Learn on to search out the a number of causes.
Cute Or Appalling?
First, right here’s a primer take a look at. Some canine mother and father soften after they see pups licking one another’s mouths, others cringe and attain for the hand sanitizer. Is it candy affection or simply plain gross? Watch these fast clips and resolve for your self.
Why Do Canine Lick Every Different’s Mouths? 8 Fundamental Causes
It could look odd (or somewhat gross), however canine don’t hand out slobbery mouth licks at random. This ritual is an element intuition, half communication, and half “I odor snacks.” From pet survival methods to canine diplomacy, listed below are the high eight the reason why canine lick one another within the mouth and what it actually means.
1. A Doggy Handshake: Greeting Rituals
For us, greetings are handshakes, hugs, or perhaps an ungainly wave. When canine meet, their first impression isn’t a handshake or small speak — it’s usually a fast nose-to-mouth investigation. And typically, it’s adopted up with a lick.
Why? Mouth licking serves as a social greeting ritual. Not like handshakes, licking can talk each respect and affection in the identical movement.
- Appeasement sign: One canine might lick one other’s mouth to say, “I’m not a risk.”
- Social smoothing: Simply as people use smiles to ease stress, canine use licks to maintain encounters pleasant.
- Pack dynamics: Licking helps set up order, displaying respect to a canine with larger confidence.
Patricia McConnell, Ph.D., a famend animal behaviorist, calls these “appeasement gestures” — instinctive strikes canine use to stop fights earlier than they begin. As an alternative of growling or posturing, they lick.
Consider it this fashion: whereas we change well mannered hellos, canine change slobber. Certain, it’s messy, however it works.
Fast Truth: In multi-dog households, you’ll usually see one canine greet one other with a lick after they’ve been aside, even for simply a short while. It’s their model of a “welcome again!” hug.
2. Puppyhood Instincts
The roots of this conduct go all the best way again to puppyhood. Within the wild, wolf and coyote pups lick their moms’ mouths to set off regurgitation of meals. With out that ritual, dinner doesn’t arrive.
- Survival mechanism: Puppies depend upon licking to sign starvation.
- Hardwired conduct: Regardless that kibble and canned meals changed regurgitated prey, the intuition persists.
- Evolutionary continuity: From wolves to home canine, the gesture carries on.
Wolf pups instinctively lick grownup muzzles to set off regurgitation — a conduct documented repeatedly in ethology research. Home canine have inherited this historical survival sign, although kibble has changed regurgitated prey.
So if you see your grown canine licking one other’s mouth, a part of the conduct is solely an echo of historical pet survival techniques.
Fast Truth: For this reason puppies usually lick older canine extra often than adults lick one another — it’s a conduct that fades as they develop however by no means disappears solely.
3. Love Licks: Affection & Bonding
Canine are social animals, and rituals assist keep robust group ties. Simply as primates groom one another or cats lick one another’s fur, canine use mouth licking to bond and present affection.
- Hormone enhance: Affectionate licking triggers oxytocin (the “love hormone”) in each the licker and the receiver.
- Stress reduction: A 2021 examine in Animal Behaviour discovered affiliative behaviors like licking decrease stress ranges in pack animals.
- Consolation: Canine might lick one another’s mouths after aggravating occasions to reassure one another.
So when your pup gently licks a carefully bonded canine good friend’s muzzle, it’s their manner of claiming, “I care about you.”
4. “Sure, Boss”: Mouth Licking As Canine Respect
Canine are pack animals, and like all pack constructions, somebody’s in cost. A method lower-ranking canine present respect is thru mouth licking.
- Acknowledging hierarchy: A lick usually means, “You’re the boss.”
- Battle prevention: Submissive canine use licking to stop aggression from higher-ranking canine.
- Family hierarchy: If one in all your canine all the time licks and the opposite simply accepts it, you’ve noticed the alpha of your front room.
Fast Takeaway: Licking doesn’t make one canine “weak” — it simply means they’re sensible sufficient to keep away from battle by displaying respect.
5. Canine Diplomacy: Communication Indicators
Mouth licking can also be a part of a canine’s non-verbal communication toolkit.
- Rigidity diffuser: A nervous canine might lick one other’s mouth to de-escalate battle.
- Pleasant message: Licking communicates, “I’m not right here to combat.”
- A part of calming indicators: Together with yawns, turning away, and gradual blinking, it’s a refined sign of peace.
Turid Rugaas, canine behaviorist and writer of On Speaking Phrases With Canine: Calming Indicators, highlights licking as one of the necessary appeasement gestures in canine physique language.
So the subsequent time you notice one canine licking one other’s mouth on the canine park, it might be much less about meals and extra about politics: canine diplomacy in motion.
6. Leftovers, Please: The Style Issue
Let’s be actual. Generally it’s not that deep. Generally licking is nearly leftover flavors.
- Meals residue: Canine love sampling one other canine’s current meal.
- Curiosity-driven: A lick tells them what the opposite canine simply ate.
- Gross however actual: Even unappetizing smells (to us) are fascinating to canine.

In case your canine simply licked peanut butter off a spoon, don’t be shocked if their buddy comes over for a style take a look at. To your canine, your breath after dinner is principally an open invitation: “Free samples obtainable right here.”
7. Constructed-In Vet Test: Well being Detection
Right here’s a captivating twist: canine may lick one another’s mouths to detect sickness.
Analysis exhibits that canine can odor sure ailments in people, from most cancers to diabetes, with outstanding accuracy. So it’s not a stretch to assume they will detect adjustments in one other canine’s well being, too.
Canine’ noses and tongues aren’t nearly snacks — they might additionally act as well being detectors.
- Sickness cues: Canine can odor chemical adjustments linked to illness.
- Canine are educated to detect over a dozen human ailments.
- Peer well being examine: When one canine persistently licks one other’s mouth, it might be detecting dental issues, an infection, or simply “off” smells.
So, sure — it’s potential that mouth licking doubles as a medical checkup. Canine might sense what we are able to’t.

Vet Tip: In case your canine instantly begins obsessively licking one other’s mouth, it could be value a vet go to to rule out hidden issues.
8. Grooming Rituals
Generally, licking is nearly staying clear. Canine groom one another with tongue baths, and that features the face and mouth space.
- Hygiene: Helps take away leftover meals or filth.
- Bonding: Grooming strengthens social connections.
- Consolation: Canine usually chill out when one other tends to them.
That is most typical in canine that stay collectively and already share a robust bond. Grooming by means of mouth licking is much less about hierarchy and extra about mutual care.
Fast Truth: Wolves and wild canids additionally apply mutual grooming — licking helps keep each hygiene and concord within the pack.
To Interrupt, Or Not To Interrupt?
So, must you let your canine lick different canine’ mouths? It relies upon.

- Innocent licking: Temporary, mild, occasional → superb.
- Regarding licking: Extreme, pushy, or inflicting stress → redirect.
- Well being issues: Typically secure, however keep away from if one canine has infections, sores, or contagious sickness.
Professional tip: Should you’d fairly not take care of the drool, redirect with a toy, interactive puzzle, or coaching command.
Is It Protected For Canine To Lick Every Different’s Mouths?
This is without doubt one of the most typical questions canine mother and father ask as soon as they get previous the “ew” issue. The brief reply: normally, sure, however there are exceptions.
- Regular micro organism change: Wholesome canine have robust immune techniques and may tolerate the innocent micro organism that swap throughout licking.
- Dangers throughout sickness: If one canine has kennel cough, a mouth wound, or a contagious an infection, licking can unfold it.
- Dental illness issue: If a canine has periodontal illness, mouth licking might switch micro organism that irritate the gums.
Analysis has discovered that canine saliva can carry zoonotic micro organism — which means they will unfold to different canine and even people. The chance isn’t excessive in wholesome animals, however it’s actual.
Backside line: temporary, informal mouth licks are secure between wholesome canine. But when your canine is recovering from sickness, has dangerous dental illness, or is displaying indicators of an infection, it’s higher to curb the conduct till they’re wholesome.
When To Fear: Pink Flags For Canine Dad and mom
More often than not, somewhat mouth licking is simply canine being canine. However typically, what begins out as a unusual greeting or bonding ritual can tip into one thing much less cute. Listed below are the purple flags to look at for in the event you’re questioning when this conduct crosses the road.
1. It’s Fixed Or Obsessive
In case your canine tries to lick each different canine’s mouth on repeat — or gained’t cease licking the identical companion — that’s not regular social etiquette. Obsessive licking can sign nervousness, compulsive conduct, or an underlying medical subject.
2. The Different Canine Isn’t Into It
Canine are normally well mannered, but when one canine retains turning away, growling, or snapping whereas the opposite persists, you’ve bought a social mismatch. Permitting it to proceed might create stress and even fights.
3. It Interferes With Play
Mouth licking must be temporary. If it takes over playtime, prevents regular interplay, or looks as if a fixation, that’s your cue to step in.
4. It’s Paired With Indicators Of Nausea Or Discomfort
Repetitive licking, particularly in case your canine can also be drooling, smacking lips, or gulping, can sign nausea or GI upset. In some circumstances, it might additionally level to dental illness or oral ache.
5. It Seems Extra Like Stress Than Bonding
Canine typically lick compulsively, the best way people chew their nails or faucet their toes. This generally is a coping mechanism for stress, boredom, or an unsettled setting.
Vet Tip: Occasional mouth licking is regular and wholesome. But when it turns into relentless or causes friction between canine, it’s time to examine together with your vet or a licensed behavioral animal coach. You wish to rule out well being points earlier than chalking it as much as “quirkiness.”
Why Canine Lick Human Mouths (And Whether or not You Ought to Let Them)
Should you’ve ever woken as much as your canine planting a slobbery kiss proper in your lips, you already know this conduct isn’t reserved for canine alone.
Canine lick human mouths for most of the identical causes they lick one another’s:
- Affection and bonding: You’re their pack, they usually love you.
- Submission: Canine might lick your face to acknowledge your management.
- Style: That post-pizza breath? Scrumptious.
- Data gathering: Our saliva carries scents and chemical markers that canine can interpret.
Whereas it looks like unconditional love, vets do warning towards letting canine lick straight into your mouth as a result of zoonotic micro organism can switch by means of saliva. In uncommon circumstances, these could cause infections in individuals.
Cultural & Historic Perspective
Mouth licking isn’t only a home canine conduct. It’s deeply rooted in canine historical past and different animal species, as properly.
- Wolves and coyotes: Pups lick grownup muzzles to set off regurgitation. Adults may additionally lick one another’s faces as a part of bonding and pack cooperation.
- Foxes: Ethologists have documented related behaviors in foxes, reinforcing the evolutionary continuity of this gesture.
- Dingoes and wild canine: Noticed utilizing mouth licking each as a feeding sign and as a strategy to handle social dynamics.
These parallels recommend that after we ask why do canine lick one another’s mouths, the reply isn’t fashionable in any respect — it’s historical. It’s a conduct that helped wild canids survive and thrive as cooperative hunters.
So the subsequent time you catch your Lab or your Dachshund licking a buddy’s mouth, bear in mind: they’re tapping right into a conduct older than civilization itself.
Regularly Requested Questions
Nonetheless questioning what’s behind all that slobber? You’re not alone. Canine mother and father ask these identical questions on a regular basis, normally after an ungainly canine park encounter or a shock wake-up “kiss.” Should you don’t see yours right here, ask us in our feedback.

Why Do Canine Lick Every Different’s Mouths After Consuming?
This is without doubt one of the most typical instances you’ll discover it. Canine lick one another’s mouths after meals as a result of meals smells linger. A canine’s sense of odor is so highly effective that even tiny traces of kibble, meat, or peanut butter are detectable on one other canine’s breath.
There’s additionally an instinctual angle. Within the wild, pups lick grownup muzzles after looking journeys to set off regurgitation of meals. Home canine don’t depend on that anymore, however the intuition lingers.
In case your pup licks one other canine proper after consuming, it’s normally extra about curiosity than affection. It doesn’t imply they’re hungry or underfed — they’re simply testing what the opposite canine had for dinner.
Do Canine Lick Every Different’s Mouths To Present Dominance?
Really, it’s normally the other. Most mouth licking is a submissive gesture. When one canine licks and the opposite merely accepts it, the licker is acknowledging the opposite’s larger standing.
That stated, dominance and submission in home canine aren’t as inflexible as they’re in wild packs. Generally, canine lick one another out of affection or behavior, not hierarchy. The secret is to take a look at the greater physique language image: is the licking canine reducing its head, avoiding eye contact, or rolling barely onto its aspect? That indicators submission.
So whereas dominance performs a job, mouth licking is extra about respect and appeasement than bossiness.
Is It Protected For Canine To Lick Every Different In The Mouth?
Usually, sure. Wholesome canine licking one another’s mouths is innocent. However there are exceptions value noting:
- If one canine is sick (kennel cough, higher respiratory an infection, parasites), mouth licking can unfold sickness.
- If there are mouth wounds, micro organism can go from one canine to a different.
- If one has extreme dental illness, licking might switch micro organism that worsen oral well being.
Backside line: secure between wholesome, vaccinated canine, however higher averted when sickness or an infection is concerned.
Why Does My Canine Lick My Pet’s Mouth All The Time?
Grownup canine usually lick puppies’ mouths for 2 causes:
- Affection and bonding: Puppies are susceptible, and adults usually consolation them with mild licks.
- Intuition: Within the wild, this licking would encourage mother to regurgitate meals for pups.
Puppies may additionally lick grownup mouths much more often, carrying that very same evolutionary sign: “Feed me, defend me.”
In case your grownup canine is licking your pet quite a bit, it’s normally a very good signal of acceptance and bonding. However maintain an eye fixed out. If it turns into fixed licking, it might tip into nervousness or overprotection.
Why Do Some Canine Lick Extra Than Others?
Similar to individuals, canine have particular person personalities. Some are pure lickers, whereas others not often dish out slobbery kisses. A couple of components affect this:
- Breed tendencies: Social, affectionate breeds (like Retrievers or Spaniels) usually lick greater than impartial breeds (like Basenjis).
- Early experiences: Puppies raised in shut contact with their littermates might lick extra as adults.
- Stress ranges: Anxious or high-energy canine might lick as a coping mechanism.
There’s additionally a genetic angle — in wolves, some people lick packmates much more usually than others, suggesting innate variations.
So in case your canine licks continuously whereas your neighbor’s barely licks in any respect, don’t fear. It’s normally a mixture of intuition, persona, and context.
Remaining Ideas: Drool Occurs
Canine mouth licking may gross us out, however for canine it’s an historical, instinctive, and deeply social ritual. More often than not, it’s innocent — and typically it’s even helpful.
And in the event you actually wish to perceive your pup higher, try our guides on canine physique language, how canine talk with one another, and why canine sniff every part. The extra you be taught, the much less these soggy greetings will shock you.
What about your pup? Have you ever caught them in a slobbery mouth-lick second? Share your story within the feedback — we’d love to listen to it!