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When you’ve ever taken your pup to the canine park, you’ve in all probability seen it: two canines 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 fallacious. Mouth licking is among 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 canines lick one another’s mouths? Learn on to search out the a number of causes.
Lovable Or Appalling?
First, right here’s a primer check. Some canine dad and mom soften once 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 Canines Lick Every Different’s Mouths? 8 Predominant Causes
It could look odd (or a bit of gross), however canines don’t hand out slobbery mouth licks at random. This ritual is an element intuition, half communication, and half “I scent snacks.” From pet survival methods to canine diplomacy, listed below are the high eight the reason why canines 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 a clumsy wave. When canines meet, their first impression isn’t a handshake or small discuss — it’s typically 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 could lick one other’s mouth to say, “I’m not a risk.”
- Social smoothing: Simply as people use smiles to ease rigidity, canines use licks to maintain encounters pleasant.
- Pack dynamics: Licking helps set up order, displaying respect to a canine with increased confidence.
Patricia McConnell, Ph.D., a famend animal behaviorist, calls these “appeasement gestures” — instinctive strikes canines use to forestall fights earlier than they begin. As a substitute of growling or posturing, they lick.
Consider it this manner: whereas we change well mannered hellos, canines change slobber. Positive, it’s messy, nevertheless it works.
Fast Truth: In multi-dog households, you’ll typically see one canine greet one other with a lick once 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 way in which 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: Though kibble and canned meals changed regurgitated prey, the intuition persists.
- Evolutionary continuity: From wolves to home canines, the gesture carries on.
Wolf pups instinctively lick grownup muzzles to set off regurgitation — a conduct documented repeatedly in ethology research. Home canines 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 ways.
Fast Truth: Because of this puppies typically lick older canines extra steadily than adults lick one another — it’s a conduct that fades as they develop however by no means disappears fully.
3. Love Licks: Affection & Bonding
Canines are social animals, and rituals assist preserve sturdy group ties. Simply as primates groom one another or cats lick one another’s fur, canines use mouth licking to bond and present affection.
- Hormone increase: 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: Canines could lick one another’s mouths after hectic occasions to reassure one another.
So when your pup gently licks a intently bonded canine good friend’s muzzle, it’s their approach of claiming, “I care about you.”
4. “Sure, Boss”: Mouth Licking As Canine Respect
Canines are pack animals, and like all pack buildings, somebody’s in cost. A technique lower-ranking canines present respect is thru mouth licking.
- Acknowledging hierarchy: A lick typically means, “You’re the boss.”
- Battle prevention: Submissive canines use licking to forestall aggression from higher-ranking canines.
- Family hierarchy: If certainly one of your canines 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.
- Pressure diffuser: A nervous canine could lick one other’s mouth to de-escalate battle.
- Pleasant message: Licking communicates, “I’m not right here to combat.”
- A part of calming alerts: Together with yawns, turning away, and sluggish blinking, it’s a delicate sign of peace.
Turid Rugaas, canine behaviorist and writer of On Speaking Phrases With Canines: Calming Indicators, highlights licking as some of the essential appeasement gestures in canine physique language.
So the following 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. Typically it’s not that deep. Typically licking is nearly leftover flavors.
- Meals residue: Canines 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 canines.
In case your canine simply licked peanut butter off a spoon, don’t be stunned if their buddy comes over for a style check. To your canine, your breath after dinner is mainly an open invitation: “Free samples out there right here.”
7. Constructed-In Vet Verify: Well being Detection
Right here’s a captivating twist: canines may lick one another’s mouths to detect sickness.
Analysis reveals that canines can scent sure illnesses in people, from most cancers to diabetes, with exceptional accuracy. So it’s not a stretch to suppose they will detect modifications in one other canine’s well being, too.
Canines’ noses and tongues aren’t nearly snacks — they might additionally act as well being detectors.
- Sickness cues: Canines can scent chemical modifications linked to illness.
- Canines are skilled to detect over a dozen human illnesses.
- Peer well being verify: When one canine persistently licks one other’s mouth, it may very well be detecting dental issues, an infection, or simply “off” smells.
So, sure — it’s attainable that mouth licking doubles as a medical checkup. Canines could sense what we will’t.

Vet Tip: In case your canine instantly begins obsessively licking one other’s mouth, it is likely to be value a vet go to to rule out hidden issues.
8. Grooming Rituals
Typically, licking is nearly staying clear. Canines groom one another with tongue baths, and that features the face and mouth space.
- Hygiene: Helps take away leftover meals or dust.
- Bonding: Grooming strengthens social connections.
- Consolation: Canines typically loosen up when one other tends to them.
That is commonest in canines that dwell collectively and already share a powerful bond. Grooming by mouth licking is much less about hierarchy and extra about mutual care.
Fast Truth: Wolves and wild canids additionally observe mutual grooming — licking helps preserve each hygiene and concord within the pack.
To Interrupt, Or Not To Interrupt?
So, do you have to let your canine lick different canines’ mouths? It relies upon.

- Innocent licking: Temporary, mild, occasional → positive.
- Regarding licking: Extreme, pushy, or inflicting rigidity → redirect.
- Well being issues: Typically protected, however keep away from if one canine has infections, sores, or contagious sickness.
Professional tip: When you’d slightly not cope with the drool, redirect with a toy, interactive puzzle, or coaching command.
Is It Secure For Canines To Lick Every Different’s Mouths?
This is among the commonest questions canine dad and mom ask as soon as they get previous the “ew” issue. The brief reply: normally, sure, however there are exceptions.
- Regular micro organism change: Wholesome canines have sturdy immune methods and might 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 could switch micro organism that irritate the gums.
Analysis has discovered that canine saliva can carry zoonotic micro organism — that means they will unfold to different canines and even people. The danger isn’t excessive in wholesome animals, nevertheless it’s actual.
Backside line: transient, informal mouth licks are protected between wholesome canines. But when your canine is recovering from sickness, has unhealthy dental illness, or is displaying indicators of an infection, it’s higher to curb the conduct till they’re wholesome.
When To Fear: Purple Flags For Canine Mother and father
More often than not, a bit of mouth licking is simply canines being canines. However typically, what begins out as a unusual greeting or bonding ritual can tip into one thing much less cute. Listed below are the pink flags to look at for if you happen to’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 received’t cease licking the identical companion — that’s not regular social etiquette. Obsessive licking can sign nervousness, compulsive conduct, or an underlying medical concern.
2. The Different Canine Isn’t Into It
Canines are normally well mannered, but when one canine retains turning away, growling, or snapping whereas the opposite persists, you’ve received a social mismatch. Permitting it to proceed might create rigidity and even fights.
3. It Interferes With Play
Mouth licking needs to be transient. If it takes over playtime, prevents regular interplay, or looks like 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 to be Extra Like Stress Than Bonding
Canines typically lick compulsively, the way in which people chew their nails or faucet their ft. This is usually a coping mechanism for stress, boredom, or an unsettled surroundings.
Vet Tip: Occasional mouth licking is regular and wholesome. But when it turns into relentless or causes friction between canines, it’s time to verify together with your vet or a licensed behavioral animal coach. You need to rule out well being points earlier than chalking it as much as “quirkiness.”
Why Canines Lick Human Mouths (And Whether or not You Ought to Let Them)
When 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 canines alone.
Canines lick human mouths for most of the identical causes they lick one another’s:
- Affection and bonding: You’re their pack, and so they love you.
- Submission: Canines could lick your face to acknowledge your management.
- Style: That post-pizza breath? Scrumptious.
- Data gathering: Our saliva carries scents and chemical markers that canines can interpret.
Whereas it appears like unconditional love, vets do warning in opposition to letting canines lick instantly into your mouth as a result of zoonotic micro organism can switch by 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 effectively.
- Wolves and coyotes: Pups lick grownup muzzles to set off regurgitation. Adults might also lick one another’s faces as a part of bonding and pack cooperation.
- Foxes: Ethologists have documented comparable behaviors in foxes, reinforcing the evolutionary continuity of this gesture.
- Dingoes and wild canines: Noticed utilizing mouth licking each as a feeding sign and as a technique to handle social dynamics.
These parallels counsel that after we ask why do canines 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 following 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 dad and mom ask these identical questions on a regular basis, normally after a clumsy canine park encounter or a shock wake-up “kiss.” When you don’t see yours right here, ask us in our feedback.

Why Do Canines Lick Every Different’s Mouths After Consuming?
This is among the commonest instances you’ll discover it. Canines lick one another’s mouths after meals as a result of meals smells linger. A canine’s sense of scent 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 searching journeys to set off regurgitation of meals. Home canines 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 trying out what the opposite canine had for dinner.
Do Canines Lick Every Different’s Mouths To Present Dominance?
Really, it’s normally the alternative. Most mouth licking is a submissive gesture. When one canine licks and the opposite merely accepts it, the licker is acknowledging the opposite’s increased standing.
That stated, dominance and submission in home canines aren’t as inflexible as they’re in wild packs. Typically, canines lick one another out of affection or behavior, not hierarchy. The bottom line is to take a look at the larger physique language image: is the licking canine reducing its head, avoiding eye contact, or rolling barely onto its aspect? That alerts submission.
So whereas dominance performs a job, mouth licking is extra about respect and appeasement than bossiness.
Is It Secure For Canines To Lick Every Different In The Mouth?
Most often, sure. Wholesome canines 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 cross from one canine to a different.
- If one has extreme dental illness, licking could switch micro organism that worsen oral well being.
Backside line: protected between wholesome, vaccinated canines, however higher averted when sickness or an infection is concerned.
Why Does My Canine Lick My Pet’s Mouth All The Time?
Grownup canines typically lick puppies’ mouths for 2 causes:
- Affection and bonding: Puppies are weak, and adults typically consolation them with mild licks.
- Intuition: Within the wild, this licking would encourage mother to regurgitate meals for pups.
Puppies might also lick grownup mouths much more steadily, carrying that very same evolutionary sign: “Feed me, defend me.”
In case your grownup canine is licking your pet loads, it’s normally a very good signal of acceptance and bonding. However hold an eye fixed out. If it turns into fixed licking, it might tip into nervousness or overprotection.
Why Do Some Canines Lick Extra Than Others?
Identical to individuals, canines have particular person personalities. Some are pure lickers, whereas others hardly ever dish out slobbery kisses. Just a few elements affect this:
- Breed tendencies: Social, affectionate breeds (like Retrievers or Spaniels) typically lick greater than unbiased breeds (like Basenjis).
- Early experiences: Puppies raised in shut contact with their littermates could lick extra as adults.
- Stress ranges: Anxious or high-energy canines could lick as a coping mechanism.
There’s additionally a genetic angle — in wolves, some people lick packmates much more typically than others, suggesting innate variations.
So in case your canine licks consistently whereas your neighbor’s barely licks in any respect, don’t fear. It’s normally a mixture of intuition, persona, and context.
Closing Ideas: Drool Occurs
Canine mouth licking may gross us out, however for canines it’s an historical, instinctive, and deeply social ritual. More often than not, it’s innocent — and typically it’s even helpful.
And if you happen to actually need to perceive your pup higher, take a look at our guides on canine physique language, how canines talk with one another, and why canines sniff every thing. The extra you study, 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!