Why Does My Dog Lick My Other Dog's Ears? Understanding
Why does my dog lick my other dog's ears? Explore the canine science, evolutionary roots, and health signals behind this common multi-dog behavior.
Quick Answer: Why Does My Dog Lick My Other Dog's Ears?
Dogs lick other dogs' ears primarily as a social bonding behavior rooted in allogrooming — a mutual grooming practice inherited from their wolf ancestors. Ear licking releases endorphins in both the licker and the recipient, reinforcing pack cohesion. Secondary reasons include taste attraction (ear wax contains salts and fatty acids dogs find appealing), submissive signaling, and investigative behavior. In most cases, it's entirely normal. However, excessive or obsessive ear licking can signal an underlying ear infection in the recipient dog, anxiety in the licker, or a nutritional deficiency.
If you share your home with more than one dog, you've almost certainly witnessed this scene: one dog methodically licking the inside of another dog's ear, sometimes for minutes at a time, while the recipient sits with a glazed, contented expression. It looks strange. It feels unsanitary. And if you're a first-time multi-dog owner, you might wonder whether to intervene.
The short answer is that ear licking between dogs is a deeply ingrained, evolutionarily adaptive behavior. But understanding exactly why it happens — and when it crosses from normal social behavior into something that needs attention — requires a look at canine neurobiology, wolf pack dynamics, and the specific physiology of the canine ear.
The Evolutionary Basis: Ear Licking in Wolves and Ancestral Dogs
🐺 From Wolf Pack to Living Room
Allogrooming — grooming another member of your social group — is well-documented in gray wolves (Canis lupus). In wild wolf packs, pack members groom each other's faces, ears, and neck regions as a mechanism for reinforcing social bonds and reducing group tension. This behavior is most frequent between closely bonded individuals: mated pairs, littermates, and parent-offspring pairs.
When dogs were domesticated approximately 15,000–40,000 years ago, they retained this allogrooming instinct but redirected it. Domestic dogs allogroom not only other dogs but also humans — licking hands, faces, and yes, ears. A 2016 study published in Applied Animal Behaviour Science found that dogs who engaged in more affiliative behaviors (including licking) toward packmates showed lower cortisol levels, suggesting a genuine stress-reduction function.
In wolf ethology, the ear region is particularly significant because it's an area the animal cannot easily reach on its own. When one wolf allows another to groom its ears, it's displaying trust — exposing a vulnerable sensory organ. This same dynamic plays out when your Labrador licks your Beagle's ears: the recipient is signaling comfort and social acceptance.
Research on captive wolf packs at the International Wolf Center has shown that allogrooming sessions increase in frequency after periods of group tension — such as a meal competition or the introduction of a new pack member. Dogs mirror this pattern: you may notice more ear licking after a stressful event like a move, a vet visit, or the arrival of a new pet.
The Neurobiology: What Happens in Your Dog's Brain During Ear Licking
The Endorphin Feedback Loop
Repetitive licking behavior triggers the release of beta-endorphins in the dog's brain — the same opioid-like neurotransmitters associated with pleasure and pain relief. This creates a self-reinforcing cycle: licking feels good, so the dog licks more, which releases more endorphins.
For the receiving dog, ear stimulation activates the vagus nerve, which runs from the brainstem through the ear region. Vagal stimulation activates the parasympathetic nervous system — the body's "rest and digest" mode — lowering heart rate and producing a calming effect. This is why the dog being licked often appears relaxed or even drowsy.
The canine ear contains a dense network of nerve endings, particularly in the pinna (the external ear flap) and the vertical ear canal. According to the Merck Veterinary Manual, the external ear is richly supplied with sensory nerves from the trigeminal and facial nerve branches, making it highly sensitive to touch and pressure.
From a neurochemical perspective, here's the sequence that unfolds during an ear-licking session:
- Sensory input: The licking dog's tongue contacts the ear, stimulating mechanoreceptors in both the tongue and the recipient's ear skin.
- Neural signaling: Signals travel via the trigeminal nerve to the brainstem and then to the hypothalamus in both dogs.
- Neurotransmitter release: The hypothalamus triggers beta-endorphin release in the licker and vagal activation in the recipient.
- Behavioral reinforcement: Both dogs experience a pleasurable or calming sensation, reinforcing the behavior for future repetition.
This mechanism is fundamentally different from how humans process similar tactile stimulation. Human ear canals lack the same density of vagal afferent fibers found in dogs, which is why having your ear licked doesn't produce the same calming response in you that it does in your dog.
Why the Ears Specifically? The Taste and Scent Factor
There's a practical reason dogs target ears rather than, say, elbows or tails: canine ear wax is genuinely appealing to other dogs.
Canine cerumen (ear wax) is composed of secretions from the ceruminous glands and sebaceous glands in the ear canal. It contains:
- Fatty acids — including linoleic acid and oleic acid, which dogs can detect at very low concentrations
- Salts and minerals — sodium and potassium from sweat gland secretions
- Dead skin cells — a protein source
- Environmental scent particles — trapped from the dog's surroundings
Dogs possess approximately 300 million olfactory receptors (compared to our 6 million), and the ear region concentrates scent information in a small area. When your dog licks another dog's ear, they're simultaneously gathering chemical information about where the other dog has been, what they've eaten, and their general health status.
| Behavior | Primary Function | Target Area | Typical Duration |
|---|---|---|---|
| Ear licking | Bonding, taste investigation, calming | Pinna and ear canal opening | 30 seconds – 5 minutes |
| Face/muzzle licking | Submissive greeting, food solicitation | Muzzle, lips, chin | 5 – 30 seconds |
| Body allogrooming | Social bonding, coat maintenance | Back, neck, shoulders | 1 – 10 minutes |
| Paw licking (of another dog) | Scent investigation, taste | Interdigital spaces, pads | 10 – 60 seconds |
| Genital licking (of another dog) | Health investigation, estrus detection | Perineal region | 5 – 20 seconds |
What Does It Mean When My Dog Licks My Other Dog's Ears?
Context matters enormously. The same ear-licking behavior can mean different things depending on the situation, the dogs' relationship, and the body language accompanying the licking.
Affiliative Bonding (Most Common)
If both dogs are relaxed — soft eyes, loose body posture, possibly leaning into each other — the ear licking is social bonding. This is most common between dogs that share a household and have an established, positive relationship. You'll often see this during quiet downtime: on the couch, after a walk, or before sleep.
Submissive or Appeasement Behavior
A lower-ranking dog may lick the ears of a higher-ranking dog as an appeasement gesture. In this context, the licking dog's body will be lower, possibly with a tucked tail, averted gaze, and a crouched posture. This is not "weakness" — it's a sophisticated communication tool that prevents conflict.
Investigative Behavior
If one dog has recently been outside, rolled in something, or has a new scent on their coat, the other dog may lick their ears to gather information. This type of licking is typically brief (under 30 seconds) and accompanied by intense sniffing of the ear region.
Attention-Seeking or Boredom
Dogs that are understimulated may lick another dog's ears simply because it provokes a reaction. If the recipient dog tolerates or enjoys it, the behavior gets reinforced. This is especially common in adolescent dogs (6–18 months) with excess energy.
When Ear Licking Signals a Problem
⚠️ Red Flags: When Ear Licking Needs Veterinary Attention
- The recipient dog shakes their head frequently after licking sessions — possible ear infection (otitis externa)
- Visible discharge — brown, yellow, or bloody material in the ear canal
- Foul odor emanating from the ear — often indicates bacterial or yeast overgrowth
- The licking dog becomes obsessive — won't stop, follows the other dog from room to room to continue licking, shows distress when interrupted
- The recipient dog resists — growls, snaps, moves away repeatedly but the licker persists
- Redness or swelling of the pinna or ear canal
- One dog suddenly starts licking when this behavior was never present before — sudden behavioral changes warrant investigation
If you observe any of these signs, consult your veterinarian. The licking dog may be detecting an ear infection before you notice visible symptoms — dogs can smell the volatile organic compounds produced by bacterial and yeast infections at concentrations far below human detection thresholds.
The Ear Infection Detection Phenomenon
This deserves specific attention because it's one of the most practically useful aspects of ear-licking behavior. A 2017 study in the Journal of Veterinary Behavior documented cases where dogs persistently licked or sniffed another dog's ear region, and subsequent veterinary examination revealed early-stage otitis externa that was not yet visible to the owner.
Dogs with floppy ears — Cocker Spaniels, Basset Hounds, Springer Spaniels, Labrador Retrievers — are particularly prone to ear infections because the folded pinna traps moisture and creates a warm, dark environment ideal for bacterial and yeast growth. If your dog has a floppy-eared housemate and suddenly becomes fixated on licking their ears, schedule a veterinary ear exam.
Common causes of otitis externa your vet will check for include:
- Yeast overgrowth (Malassezia pachydermatis) — the most common culprit, producing a distinctive sweet-musty odor
- Bacterial infection — often Staphylococcus pseudintermedius or Pseudomonas aeruginosa
- Ear mites (Otodectes cynotis) — more common in puppies and dogs from shelters
- Foreign bodies — grass awns (foxtails) are a frequent cause in summer months
- Allergies — atopic dermatitis manifests in the ear canal in approximately 80% of affected dogs
Breed Variations in Ear Licking Behavior
While ear licking occurs across all breeds, certain breed groups display it more frequently due to their genetic behavioral profiles:
| Breed Group | Ear Licking Tendency | Why | Example Breeds |
|---|---|---|---|
| Sporting Group | High | Bred for cooperative pack behavior; strong oral fixation from retrieving work | Labrador Retriever, Golden Retriever, Cocker Spaniel |
| Herding Group | Moderate–High | Oral behaviors channeled into herding; high social bonding drive | Border Collie, Australian Shepherd, Shetland Sheepdog |
| Hound Group | High | Scent-driven investigation; floppy ears create accessible targets | Beagle, Basset Hound, Bloodhound |
| Working Group | Moderate | Strong pack bonding but less oral fixation than sporting breeds | Boxer, Rottweiler, Bernese Mountain Dog |
| Terrier Group | Low–Moderate | More independent; less affiliative grooming drive | Jack Russell Terrier, Scottish Terrier, Bull Terrier |
| Brachycephalic breeds | Variable (often lower) | Shorter tongues and jaw structure make sustained licking more physically difficult | French Bulldog, Pug, Shih Tzu |
Common Misconceptions About Dog Ear Licking
| Myth | Fact |
|---|---|
| "The licking dog is trying to dominate the other dog." | Ear licking is affiliative, not dominance behavior. Modern canine behavior science, including research summarized by the AVMA, has largely discredited dominance-based frameworks for explaining dog-to-dog interactions. Allogrooming builds social bonds — it doesn't establish hierarchy. |
| "Dog saliva cleans the ear, so it's actually good for them." | While dog saliva contains some antibacterial compounds (lysozyme, immunoglobulin A), it also harbors bacteria like Pasteurella multocida and Capnocytophaga canimorsus. Excessive moisture in the ear canal from licking creates an environment that promotes infection rather than preventing it. |
| "If the dog being licked doesn't pull away, they must enjoy it." | Dogs can display learned helplessness or passive tolerance that isn't the same as enjoyment. Watch for subtle stress signals: lip licking, yawning, whale eye (showing the whites of the eyes), body freezing, or ear pinning. A truly comfortable dog will lean into the interaction with relaxed muscles. |
| "Ear licking means the dog has a nutritional deficiency." | While pica (eating non-food items) can sometimes signal deficiencies, ear licking is primarily a social behavior, not a dietary one. If your dog is eating a complete-and-balanced diet meeting AAFCO standards, nutritional deficiency is extremely unlikely to be the cause. |
| "You should always stop ear licking immediately." | Brief, mutual ear-licking sessions between comfortable housemate dogs are normal and beneficial for social bonding. Intervention is only needed when the behavior is excessive, one-sided, or accompanied by signs of ear disease. |
Practical Takeaways: Managing Ear Licking in a Multi-Dog Household
What You Should Do
1. Inspect both dogs' ears weekly. Lift the pinna and look at the ear canal opening. Healthy ears are pale pink with minimal wax. If you see redness, discharge, excessive wax buildup (dark brown or black), or smell an odor, schedule a vet visit. Most veterinary clinics charge $50–$85 for an ear exam and cytology, with treatment costs ranging from $30–$150 depending on the medication prescribed.
2. Allow brief sessions, interrupt prolonged ones. As a guideline, ear licking lasting under 2–3 minutes with both dogs relaxed is fine. If sessions regularly exceed 5 minutes, gently redirect the licking dog using positive reinforcement — call them to you and reward with a treat or a chew toy. Never use punishment, scolding, or aversive tools.
3. Keep floppy-eared dogs' ears dry. If one of your dogs has pendulous ears, clean them weekly with a veterinarian-approved ear cleanser. Products like Epi-Otic Advanced (Virbac, approximately $18–$24 for 8 oz) or Zymox Ear Cleanser ($12–$16 for 4 oz) are widely recommended. After swimming or bathing, dry the ear canals with a cotton ball — never insert cotton swabs into the ear canal.
4. Provide adequate enrichment. Excessive ear licking often stems from boredom. Ensure both dogs receive breed-appropriate exercise (typically 30–90 minutes daily for most breeds) and mental stimulation through puzzle feeders, scent work, or training sessions. A Kong Classic stuffed with frozen peanut butter ($15–$20 for the medium size) can occupy a dog for 20–40 minutes.
5. Watch for displacement behavior. If the licking dog seems unable to stop, appears anxious when separated from the other dog, or licks to the point of creating raw skin on the recipient's ear, this may be a compulsive behavior. Compulsive licking affects an estimated 2–3% of the canine population and may require intervention from a veterinary behaviorist (consultation fees typically $200–$400) and possibly anti-anxiety medication.
How Is This Different From Humans?
Humans don't have an equivalent to canine allogrooming in our behavioral repertoire, which is why ear licking seems so alien to us. But the underlying neurochemistry is surprisingly similar to human bonding behaviors:
- Oxytocin release: Both dogs experience oxytocin elevation during affiliative physical contact, the same hormone that facilitates bonding between human parents and infants.
- Tactile communication: Where humans use verbal affirmation and physical touch (handshakes, hugs), dogs use grooming and licking as primary social tools.
- Sensory differences: A dog's tongue has roughly 1,700 taste buds compared to our 9,000, but their vomeronasal organ (Jacobson's organ) allows them to process chemical information from ear wax that humans simply cannot detect.
- Social structure: Dogs, like humans, are obligate social animals. Ear licking is one of dozens of mechanisms they use to maintain social bonds — functionally similar to a human checking in on a friend.
Frequently Asked Questions
Is it normal for my dog to lick my other dog's ears every day?
Yes, daily ear licking is normal in multi-dog households where the dogs have a bonded relationship. As long as sessions are brief (under 3–5 minutes), both dogs appear relaxed, and the recipient dog's ears remain healthy on inspection, there's no reason to intervene.
Can my dog get sick from licking another dog's ears?
The risk is low but not zero. If the recipient dog has an active ear infection, the licking dog could be exposed to bacteria or yeast. However, a healthy dog's immune system and oral microbiome typically handle this exposure without issue. The greater risk is to the recipient dog, as excess moisture from licking can worsen or trigger ear infections.
Why does my dog only lick one specific dog's ears and not the others?
This typically reflects a stronger social bond with that particular dog, or it may indicate that the target dog's ears produce more wax or have a scent profile the licker finds especially interesting. If the targeted dog has a chronic low-grade ear issue, the licking dog may be responding to the altered scent.
Should I let my dog lick my puppy's ears?
Supervised, brief ear licking from a healthy adult dog toward a puppy is generally safe and can actually help the puppy integrate into the household social structure. However, puppies have more sensitive skin and developing immune systems, so limit sessions to under a minute and monitor the puppy's ears for any redness or irritation.
How do I stop my dog from obsessively licking another dog's ears?
Use positive reinforcement to redirect the behavior. When the licking starts, call the dog to you and reward them for coming. Provide an alternative oral activity — a long-lasting chew like a bully stick ($3–$8 each) or a dental chew. Increase daily exercise and mental stimulation. If the behavior persists despite consistent redirection over 2–3 weeks, consult a certified professional dog trainer (CPDT) or veterinary behaviorist.
My dog licks the other dog's ears and then throws up — is this related?
Ingesting large quantities of ear wax, hair, and debris can irritate a dog's stomach and cause vomiting, particularly in smaller dogs. If this happens repeatedly, it's a sign the ear-licking sessions are too long or the recipient dog's ears need cleaning. Schedule a vet visit for both dogs — the vomiting dog to rule out gastrointestinal issues, and the recipient to address any ear overproduction.
Aaron Whyte
All our authors care for dogs every day — read more of their work on the authors page.
