How to Tell a Dog's Age by Teeth? (Stage-by-Stage)

Check the mouth in four passes: whether the teeth are baby or adult, which teeth have erupted, how worn the incisor tips are, and how much tartar, staining and gum recession has built up. Eruption dates a puppy to within a few weeks. Wear places an adult dog inside a band — "about three to five years" rather than a birthday. The estimate gets looser the older the dog is, which is why shelters list an age range and not a date.

The four-step mouth check, in order

Before anything else: only look inside the mouth of a dog that is comfortable being handled by you. A rescue dog on day two, a dog that flinches when you touch its face, or a dog in obvious oral pain is not a dog to practise on. Lift the lip at the side with a thumb rather than prying the jaw open — with the mouth closed you can see the incisors, the canines and the gum line, which is most of what you need.

Step one: decide whether you are looking at baby teeth or adult teeth. Deciduous (puppy) teeth are small, needle-sharp, slightly translucent and noticeably thin. Permanent teeth are blockier, opaque white and much thicker at the base, especially the canines. If any baby teeth are still present, you are almost certainly looking at a dog under seven months.

Step two: note which teeth are present. A puppy has 28 deciduous teeth; an adult dog has 42 permanent teeth. Puppies have no molars at all, so molars at the back of the jaw mean the dog is past the puppy stage.

Step three: look at the incisors head-on, mouth closed. A freshly erupted adult incisor has a three-pointed crown — a central peak with a small point on either side, often described as a fleur-de-lis. Those points wear down in a predictable order, lower jaw first, and that order is the backbone of every dental age chart.

Step four: read the soft signals. Tartar usually appears first as a yellow-brown band at the gum line of the upper cheek teeth. Then come generalised staining, gums that have pulled back to expose more of the tooth, blunted canine tips, and eventually loose or missing teeth.

Puppy teeth: the most precise window you'll get

If the dog in front of you is a puppy, teeth will date it better than anything else short of a veterinary exam. Eruption is driven by development rather than lifestyle, so it runs to a fairly tight schedule across breeds. Giant breeds can run slightly late and toy breeds slightly early, but the sequence does not change.

Approximate age	What you see in the mouth
Birth to ~2 weeks	No visible teeth
~2–4 weeks	Deciduous incisors and canines pushing through; needle-sharp
~4–6 weeks	Deciduous premolars coming in behind the canines
~6–8 weeks	Full set of 28 baby teeth, bright and translucent
~3–4 months	Baby incisors shed and replaced by permanent incisors; gaps and mixed sizes are normal
~4–6 months	Permanent canines and premolars erupt; retained baby canines sometimes sit alongside
~6–7 months	Permanent set completes; molars are the last to arrive
7 months–1 year	All 42 adult teeth, brilliant white, incisor points fully intact, no tartar

A mixed mouth — some baby teeth, some adult — is the single most useful finding there is, because it narrows the age to a window of weeks. Retained deciduous canines are common in small breeds and are worth raising with your veterinarian, since they crowd the permanent tooth and trap debris.

Reading wear in an adult dog

Once the adult set is complete, you stop counting teeth and start reading surfaces. The classic sequence is that the cusps of the lower central incisors flatten first, then the lower middle incisors, then the uppers, followed by progressive blunting of the canines.

Estimated age	Typical dental picture
~1 year	Clean, white, cusps sharply pointed; no tartar
~1–2 years	Cusps of the lower central incisors starting to dull; faint tartar on the back teeth
~2–3 years	Lower central and middle incisor cusps worn noticeably flat; mild yellowing
~3–5 years	Upper incisor cusps wearing; visible tartar at the gum line; canines losing their fine point
~5–7 years	Incisor tops broadly flattened; staining across the cheek teeth; early gum recession
~7–10 years	Heavy tartar, receded gums, blunt canines, possible missing or fractured teeth
10+ years	Significant wear, worn-down incisors, tooth loss and advanced dental disease common

Treat the lower half of that table as an estimate with a wide margin. Teeth tell you with real precision when a dog's mouth stopped being a puppy's mouth; after that, they mostly tell you how hard that mouth has worked, which is only loosely connected to how many birthdays the dog has had.

Why two dogs the same age can look years apart

Wear is behaviour, not biology. A five-year-old dog who has spent those years carrying tennis balls — the felt is abrasive and sands down enamel — or chewing rocks, fence wire, crate bars or antlers can present a mouth that reads eight or nine. A five-year-old who chews soft toys and eats from a bowl may still have recognisable cusps.

A few patterns worth holding in mind:

Strong-jawed, enthusiastic chewers — bully and pit bull-type dogs among them — often show wear and canine blunting ahead of schedule. The eruption timeline does not change for these dogs; only the wear does. Small and toy breeds tend to accumulate tartar and periodontal change earlier because of crowding in a short jaw, so their mouths can read older than they are. Sex makes no meaningful difference to either eruption or wear, so a photo chart for a female dog is the same chart as for a male. And a dog who has had professional dental cleanings will look years younger than a dog of identical age who has never had one, because you have removed the main thing you were about to measure.

That is also the honest answer to the online tools: a dog age calculator built around a photo or a dropdown is applying the same wear stages above without ever seeing the mouth, and the free printable charts and PDFs circulating on forums and Reddit are showing an averaged mouth rather than this one. Crowdsourced guesses from a single phone photo are usually decent for puppies and frequently years off for adults. The method is more useful than the verdict.

Age clues outside the mouth

Dental wear is one input. Pair it with the rest of the dog before you commit to a number.

Eyes are the most useful second signal. A faint bluish-grey haze deep in the lens — nuclear sclerosis — is a normal ageing change that develops in middle age and onward, and it is distinct from cataract, which a veterinarian can tell apart on examination. Muzzle greying is far less reliable than people assume; plenty of dogs grey in their second or third year, particularly dark-coated ones.

Coat texture tends to coarsen and thin with age, and some dogs develop a dull or slightly greasy feel. Muscle is informative too: look at the mass over the hind end, the shoulders and the top of the skull, since age-related muscle loss often shows there first. Watch the dog rise from lying down, take the first few steps, and negotiate stairs — stiffness that eases with movement is a classic older-dog pattern. Skin elasticity, nail thickness and the general level of bounce in play all add detail.

Finally, there is a step no chart replaces. A veterinarian can combine oral examination with body condition scoring, joint palpation, eye examination, bloodwork and, in young dogs, radiographs that show whether the growth plates have closed. Talk to your veterinarian when you adopt a dog of unknown age — their estimate will be better than yours, and it sets the baseline for everything afterwards.

What the estimate changes about day-to-day care

An age band is not trivia. It shapes how often a dog should have wellness bloodwork, when a veterinarian will start watching joints and weight more closely, how you pitch exercise, and how you plan dental care — which, for a mouth already carrying heavy tartar, is a conversation to have with your vet rather than a brushing routine alone.

It also shapes how owners think about tendon, ligament and mobility support. Dogs whose teeth read older are often dogs whose joints have taken the same mileage: the chewer, the fence-runner, the long-serving working dog. Many owners of middle-aged and senior dogs, and of dogs working through a veterinary rehab plan, add peptide support during that window. K9-REPAIR from pawgen combines BPC-157 and TB-500, two peptides that have drawn research attention for their roles in tissue repair biology — BPC-157 in studies of angiogenesis and tendon and ligament cell migration, TB-500 as a synthetic fragment related to thymosin beta-4, a protein involved in actin regulation and cell movement. Research in this area is emerging and promising, and it is mechanism, not an outcome promise: these are not FDA-approved veterinary drugs, and research suggests pathways rather than guarantees. K9-REPAIR is dosed by body weight, third-party tested with batch certificates of analysis published openly, shipped direct to the door, and backed by a 60-day money-back guarantee. Owners report using it alongside — never instead of — the prescriptions, surgery and rehab their veterinarian has put in place.

Key Takeaways

• Eruption dates puppies accurately; wear only places adults in a range.
• Baby teeth are thin, sharp and translucent; adult teeth are thick and opaque. Any baby teeth present means roughly under seven months.
• 28 deciduous teeth, 42 permanent teeth; molars arrive last, around six to seven months.
• In adults, read incisor cusp wear first, then tartar, staining, gum recession and tooth loss.
• Chewing habits, breed size and past dental cleanings can shift a mouth's apparent age by years in either direction.
• Confirm with eyes, coat, muscle and gait, then have a veterinarian give the working estimate.

For readers looking deeper into pawgen's formulation standards, batch certificates of analysis are published at /coas/, the current range including K9-REPAIR is listed at /shop/, and availability details are at /location/.

A dental age estimate is a starting point, not a diagnosis. Your veterinarian owns the diagnosis and the treatment plan — the oral examination, the decision about whether that tartar needs a scale and polish under anaesthesia, the bloodwork cadence for a senior dog, and any medication or surgery that follows. Supplements and peptides operate in the space that proper veterinary care creates, supporting a dog through a plan rather than standing in for one.

Owners exploring peptide support for their dog can review K9-REPAIR — BPC-157 + TB-500 formulated for dogs — at https://pawgen.com/. BPC-157 and TB-500 are not FDA-approved veterinary drugs. Nothing in this article treats, cures or prevents any condition; every decision about your dog's care belongs with your veterinarian.