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May 13, 2026
Why Do Dogs Lick You?

Dogs lick people — a lot. According to Small Door Veterinary, licking is one of the most natural and multi-purpose communication tools dogs have. It begins the moment they are born — mother dogs lick their puppies to stimulate breathing, encourage feeding and bond. That same impulse never fully switches off, and adult dogs redirect it toward the humans they are closest to. Whether your dog licks your face, your hands or your feet, the behaviour almost always means something — and it is rarely random.

Why Dogs Lick You: The Main Reasons

Licking is never just one thing — context tells you a lot about what your dog is actually communicating.

Affection and bonding

The most common reason dogs lick people is the simplest one: they like you. Licking releases endorphins in dogs — it is a self-reinforcing, pleasurable behaviour that feels good to perform. When directed at a person the dog is attached to, it functions as a direct expression of social bonding. In wolf packs, lower-ranking individuals lick the faces of higher-ranking ones as a greeting and a signal of trust. Domestic dogs retain this behaviour and redirect it toward the humans they consider their family. A dog that greets you with licks when you come home is doing the canine equivalent of a hug.

Gathering information

A dog’s sense of smell is extraordinarily powerful, but licking takes scent detection even further — it delivers molecules directly to the Jacobson’s organ on the roof of the mouth, which processes chemical information at a level far beyond what the nose alone can detect. When your dog licks you after you return home, they are reading a detailed account of where you have been, what you touched, what you ate and who you encountered. Licking your sweaty skin after exercise is partly about taste — sweat contains salts that dogs find appealing — and partly about this information-gathering function.

Attention-seeking

Dogs are quick to learn that licking produces a human reaction — a laugh, a pat, eye contact, a verbal response. Once a dog discovers that licking is an effective way to get your attention, it becomes a reliable tool they will return to whenever they want to engage with you. This is not manipulation; it is straightforward learned behaviour. The problem is that any response — even saying “stop” — can function as a reward. If you want to reduce attention-seeking licking, the only consistently effective approach is to completely withdraw attention the moment it starts.

Stress relief and self-soothing

Licking releases endorphins and has a calming effect on dogs experiencing anxiety. A dog that licks you during a thunderstorm, in a new environment or when there is tension in the household is likely using licking as a self-soothing strategy. In this context it functions similarly to nail-biting or repetitive fidgeting in humans — a physical action that occupies the body and slightly reduces cortisol. Recognising stress-motivated licking matters because the underlying anxiety deserves attention, not just the symptom.

Submission and social communication

Licking the face of a perceived authority figure is a deeply instinctive canine social signal. Puppies lick the mouths of adult dogs to solicit food or approval. Adult dogs use the same behaviour to communicate deference or peaceful intent. When your dog licks your face — especially around the mouth — they may be performing a version of this social ritual, acknowledging you as a trusted member of their social group rather than simply expressing affection.

What Licking Different Parts Means

Where your dog chooses to lick can refine your understanding of what they are trying to communicate.

  • Face and mouth: social bonding and greeting — the most instinctively loaded target, mimicking the puppy-to-adult licking behaviour seen in packs
  • Hands: information-gathering — your hands carry the most chemical information about your day; also common as attention-seeking if your hands are near your dog’s level
  • Feet and legs: taste — sweat concentration is highest here; also a low-effort lick when they are lying near you and want to maintain contact
  • Ears: social grooming — a behaviour directed at close companions; dog earwax has a distinctive scent that some dogs find interesting
  • Wounds or sore spots on you: caregiving instinct — dogs instinctively lick wounds on themselves and others; while the intention is nurturing, dog saliva introduces bacteria and should be discouraged on open skin

Is It Safe to Let Your Dog Lick You?

For most healthy adults, occasional licking is low risk. The common belief that dogs’ mouths are cleaner than humans’ is a myth — but the actual risks are generally manageable.

Dog saliva contains bacteria — including Pasteurella, Capnocytophaga and Staphylococcus — that are harmless to dogs but can occasionally cause infections in humans, particularly through broken skin, eyes or mucous membranes. For healthy adults with intact skin, the risk from a lick is very low. Higher caution applies in these situations:

  • Open cuts or wounds: dog saliva introduces bacteria that can cause infection — redirect licking away from any broken skin
  • Face licking: bacteria entering through eyes, nose or mouth carries a higher risk than skin licking
  • Immunocompromised individuals: people on chemotherapy, organ transplant recipients, those with HIV or the elderly have reduced capacity to fight bacterial infections — extra caution is warranted
  • Young children: immune systems are still developing and children are more likely to have cuts or touch their faces after contact

Washing your hands after contact is the simplest practical precaution and sufficient for most people in most situations.

When Licking Becomes a Problem

Occasional licking is normal. These patterns are worth discussing with your vet.

  • Compulsive or non-stop licking: licking that cannot be interrupted, lasts for extended periods or seems to happen regardless of context can indicate obsessive-compulsive disorder, anxiety or a neurological issue
  • Sudden increase in licking: a dog that was not a frequent licker and suddenly starts licking you or themselves constantly may be experiencing pain, nausea or discomfort — licking can be a self-soothing response to physical distress
  • Licking specific spots on themselves repeatedly: acral lick dermatitis — a condition where dogs lick one area of skin so persistently they cause hair loss and open sores — requires veterinary treatment
  • Licking combined with other behaviour changes: if licking accompanies restlessness, appetite loss, vomiting or other symptoms, the licking is likely a signal rather than the primary issue

Further reading on dog behaviour:

FAQ

Does my dog lick me because they love me?

Very likely yes — especially if it happens during calm, relaxed moments or when greeting you. Licking directed at a specific person, done gently and accompanied by a relaxed body posture, is one of the clearer expressions of canine affection.

Why does my dog lick me more after I shower?

Because you smell different. Soap, shampoo and lotion replace your natural scent with unfamiliar chemical compounds that dogs find interesting and worth investigating. Some dogs also prefer the taste of moisturiser or body lotion — check that any products you use are not toxic to dogs, as they may lick and ingest small amounts.

How do I get my dog to stop licking me?

Withdraw all attention the moment licking starts — stand up, turn away or leave the room without saying anything. When your dog stops and sits calmly, reward that behaviour instead. Consistency is essential: any reaction, including pushing them away or saying no, can function as a reward if your dog is licking for attention. Most dogs adjust within a few weeks of consistent redirection.

Why does my dog lick only one specific person?

Dogs are selective in who they lick — it reflects genuine preference and attachment. The targeted person may also smell more interesting, react more consistently or have historically rewarded the behaviour. Licking a specific person is usually a compliment.

This guide is for general information only and is not a substitute for advice from a qualified veterinarian. If your pet seems unwell, contact your vet.

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May 10, 2026
How Old Is Your Pet Really?

The “multiply by seven” rule is one of the most widely repeated myths in pet care — and it is simply wrong. Researchers at the University of California San Diego studied chemical changes in the DNA of 104 Labrador Retrievers and developed a formula based on real biological ageing. As a result, their findings are striking: a 1-year-old dog is closer in biological age to a 30-year-old human, while a 4-year-old dog is roughly equivalent to a 52-year-old person. Understanding this helps you give your pet better care at every stage of their life.

Why the “Multiply by 7” Rule Is Wrong

This rule came from a simple average — divide a human lifespan of roughly 70 years by a dog’s average of 10 — and it ignores everything science knows about how animals actually age.

Animals do not age at a constant rate

Consider this: a 9-month-old Labrador Retriever is already capable of reproduction. Physiologically, therefore, it is in adolescence or early adulthood — not early childhood. However, the “multiply by seven” rule would call it the equivalent of a 5-year-old child, which is clearly inaccurate. In reality, animals age very rapidly in early life, going through the equivalent of decades of human development in their first year or two. After that initial surge, the ageing rate slows considerably. Furthermore, the gap between the two species widens and narrows at different points in life — a young dog outpaces human development dramatically, while an older dog and an older human gradually converge again. In other words, the relationship between pet years and human years is not linear — it is logarithmic: fast at first, then progressively slower.

The DNA methylation breakthrough

To solve this problem, the UC San Diego team turned to a process called DNA methylation — chemical changes that gradually accumulate on DNA molecules as mammals age. Specifically, these chemical markers act like biological timestamps, recording how much cellular ageing has actually occurred. By comparing methylation profiles in dogs and humans at matching life stages, the scientists were able to identify striking parallels — for example, a puppy’s teeth emerging corresponded almost exactly to a human baby teething at 9 months. Moreover, elderly dogs and elderly humans showed similarly advanced methylation patterns, further confirming the model across the full lifespan.

How to Calculate a Dog’s Real Age

The UC San Diego formula: human age = 16 × ln(dog’s age in years) + 31.</strong> In practice, you simply multiply the natural logarithm of your dog’s age by 16 and then add 31 to the result. Fortunately, however, you do not need to do this mathematics yourself — the table below already applies the formula across every common age, so you can find your dog’s biological equivalent at a glance.

Dog age conversion table

Dog age Human equivalent (DNA formula) Life stage “×7 rule” (wrong)
1 year ~30 years Young adult 7 years ❌
2 years ~42 years Adult 14 years ❌
3 years ~49 years Adult 21 years ❌
4 years ~53 years Mature adult 28 years ❌
6 years ~60 years Senior 42 years ❌
8 years ~64 years Senior 56 years ❌
10 years ~68 years Senior 70 years (closest)
14 years ~74 years Geriatric 98 years ❌

1 year old dog

Real human equivalent: ~30 years

The ×7 rule said: 7 years ❌

4 year old dog

Real human equivalent: ~53 years

The ×7 rule said: 28 years ❌

10 year old dog

Real human equivalent: ~68 years

The ×7 rule said: 70 years (closest to right)

One important caveat is that this formula was developed using Labrador Retrievers specifically — so it is most reliable for medium-sized breeds. In addition, dog ageing varies significantly by size, since large and giant breeds age faster and have considerably shorter lifespans than small breeds. For instance, a 7-year-old Great Dane is genuinely old and likely already showing signs of age-related decline, whereas a 7-year-old Chihuahua is only middle-aged and probably still in excellent health. Moreover, the gap widens further at the extremes: a Great Dane may reach only 8–10 years in total, while a small terrier can easily live to 16 or 18. Therefore, while this formula represents the most biologically grounded estimate currently available, it is best treated as a guide rather than a precise measurement — particularly for very large or very small dogs.

How to Calculate a Cat’s Real Age

Much like dogs, cats follow a non-linear ageing pattern — meaning they develop at a dramatically accelerated pace in early life before slowing down considerably. In fact, the first year alone accounts for 15 full human years of development, which is why a 1-year-old kitten already behaves like a young adult rather than a child. After that rapid initial phase, the second year adds a further 9 human years, bringing the total to 24. Subsequently, every additional year beyond that counts for approximately 4 human years — a much more gradual rate that continues steadily through old age. As a result, the veterinary consensus formula is straightforward to apply in practice: start at 24 for a 2-year-old cat, then simply add 4 for every year after that.

Cat age conversion table

Cat age Human equivalent Life stage Key health note
6 months ~10 years Kitten / Junior Still growing; first vaccines due
1 year 15 years Junior / Young adult Sexually mature; spay/neuter timing
2 years 24 years Prime adult Full physical maturity reached
5 years 36 years Mature adult Annual health checks important
7 years 44 years Mature adult Begin senior screening panels
10 years 56 years Senior Kidney disease risk rises; biannual vet visits
12 years 64 years Senior Hyperthyroidism and arthritis become common
15 years 76 years Super senior Many cats reach this — impressive longevity
20 years 96 years Super senior Exceptional — some cats do reach this age

1 year old cat

Human equivalent: 15 years

Stage: Junior / Young adult

10 year old cat

Human equivalent: 56 years

Stage: Senior — biannual vet visits recommended

15 year old cat

Human equivalent: 76 years

Stage: Super senior — remarkable longevity

How Other Common Pets Age

Every species has its own distinct ageing curve, and some of the differences are genuinely surprising — even to experienced pet owners. For example, a hamster is already considered senior at just 12–18 months, while a large parrot may still be in its prime at 30. Similarly, tortoises age so slowly that certain individuals have outlived multiple generations of the same family. Understanding these differences is therefore essential — not simply out of curiosity, but because it directly shapes when to schedule vet visits, when to adjust diet and when to watch for the first signs of age-related conditions.

Pet Average lifespan Considered “senior” at Notable ageing fact
Rabbit 8–12 years 5–6 years Reach reproductive maturity at 4–6 months — equivalent to a human teenager
Guinea pig 5–7 years 3 years Already “senior” at 3 — age-related conditions appear earlier than most owners expect
Hamster 2–3 years 12–18 months Entire lifespan equivalent to roughly 26 human years; tumours become common after age 1.5
Parrot (large) 40–80 years 25–30 years Some macaws outlive their owners — they are lifelong commitments
Tortoise 50–100+ years 30–40 years Certain individuals have outlived multiple generations of the same family
Goldfish 10–15 years (well-kept) 7–8 years The “3-second memory” is false — goldfish remember complex tasks for months
Betta fish 3–5 years 2 years Most shop bettas are already 6–12 months old at the point of sale

Rabbit

Lifespan: 8–12 years

Senior at: 5–6 years

Hamster

Lifespan: 2–3 years

Note: Senior at just 12–18 months

Large parrot

Lifespan: 40–80 years

Note: May outlive their owner

Further reading on pet ageing and veterinary science:

FAQ

Where did the “multiply by 7” rule come from?

Nobody knows for certain where the rule originated. The most likely explanation is a simple average: humans live roughly 70 years, while dogs live roughly 10 — divide one by the other and you get seven. However, this calculation was never based on biology; rather, it spread because it was convenient and easy to remember. Interestingly, it is not completely wrong for dogs in the 8–12 year range, since the middle of a dog’s life is precisely where the formula happens to roughly approximate real biological ageing. Beyond that window, though, the rule breaks down significantly — underestimating age in young dogs and overestimating it in very old ones. In short, the “multiply by seven” rule is a useful conversation starter, but a poor substitute for actual science.

Does breed size really affect how fast a dog ages?

Yes — and the difference is significant. Large and giant breeds age faster than small breeds, despite the intuitive expectation that bigger means longer-lived. For example, a Great Dane is considered senior at 5–6 years, while a Chihuahua reaches senior status only at 10–11 years. Consequently, the UC San Diego formula is most accurate for medium breeds like Labradors. For giant breeds, ageing runs faster than the formula predicts; for toy breeds, it is slower.

My cat is 15 — how old is that really?

Using the veterinary 15-9-4 formula, the calculation works as follows: 24 human years for the first two cat years, plus 13 additional years × 4 = 52, giving a total of 76 human years. In other words, a 15-year-old cat is the equivalent of a 76-year-old human — genuinely elderly. As a result, this life stage deserves the same attentive medical care we give elderly people: biannual vet visits, kidney function monitoring, blood pressure checks and arthritis management.

Does knowing my pet’s real age change how I should care for them?

Absolutely — and this is the most practical reason to understand these formulas. A 7-year-old dog is not simply “middle-aged”; it is the biological equivalent of a 63-year-old human and should already be on senior wellness protocols. Specifically, this means biannual vet visits, joint monitoring, dental care and a diet adjusted for lower activity levels. Many owners miss the window for early intervention on age-related conditions precisely because they underestimate how old their pet actually is, biologically speaking.

This guide is for general information only. Pet ageing varies significantly by species, breed and individual health history. Contact your veterinarian for a personalised assessment of your pet’s life stage and health needs.

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