Dog Teeth Age Chart: Estimating Age and Senior Dental Care

Name: Dog Teeth Age Chart: Estimating Age and Senior Dental Care
Creator: Dr. Zubair Khalid

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-10-02

A dog teeth age chart works best in puppies and young dogs, because eruption timing is fairly predictable early on. In adult dogs, tooth wear gives only a rough estimate, and small breeds are harder to read than large ones [1]. If you are trying to guess a dog's age, teeth are one clue among several, not a precise measurement.

This article is educational and is not a substitute for veterinary diagnosis or treatment.

Quick Answer

Puppies get their baby teeth starting around 3 to 5 weeks of age, and permanent teeth start coming in near 4 to 5 months [1].
Most dogs have all 42 permanent teeth by about 7 months of age [1].
Tooth wear can help estimate age in large adult dogs with normal teeth and jaws, but it is less reliable in small and toy breeds [1].
Periodontal disease is common, and dogs 8 years and older are at the highest risk [2].
A vet exam, sometimes with dental radiographs, is the only way to confirm dental disease and plan treatment [3].

How to Estimate a Dog's Age From Teeth

Step 1: Look at the whole mouth, not one tooth

Start by counting what you can see. A young puppy has 28 deciduous teeth, and an adult dog has 42 permanent teeth [1]. Missing teeth, broken crowns, or heavy tartar change what you can conclude. If a tooth is already gone, you cannot use it to estimate age.

Step 2: Check for baby teeth versus adult teeth

Deciduous teeth begin to erupt at 3 to 5 weeks of age [1]. Permanent teeth usually start appearing around 4 to 5 months, and all permanent teeth are typically present by 7 months [1]. If you see a full set of clean, pointed adult teeth with no wear, the dog is likely young, often under a year.

Step 3: Note the wear pattern

Wear is the main tool for adult dogs. For most large adult dogs with normal teeth and jaws, a veterinarian can examine wear patterns and give an age estimate [1]. Flattened incisor tips, dulled canines, and exposed dentin suggest more years of chewing. This method is subjective, so treat any number as a range.

Step 4: Ask about dental imaging

Dental radiographs show what you cannot see above the gumline, including root structure and bone loss. Apical closure (when the root tip finishes forming) is one marker of maturity. In one study, half of the tooth apices studied were closed by 10 months, and 95% were closed by 17 months [4]. Canine tooth apices closed between 7 and 18 months, while the mandibular first molar and maxillary fourth premolar closed earlier, with 95% closed by 7 months [4]. This is why radiographs help more than a visual peek when age matters.

Step 5: Combine teeth with other clues

Teeth alone are imperfect. Body size, coat condition, eye clarity, and muscle tone all add information. If you are fostering a dog of unknown age, ask your veterinarian to combine the dental exam with a full physical. For senior dogs, that visit should also cover pain, mobility, and quality of life, which you can track with a quality of life scale for your senior dog.

Dog Teeth by Age Chart

This chart summarizes typical dental milestones. It is a guide, not a diagnosis. Individual dogs vary, and small breeds are especially hard to age by teeth [1].

Age	What You May See	What It Means
3 to 5 weeks	Baby teeth begin to erupt [1]	Nursing puppy, mouth is changing fast
4 to 5 months	Permanent teeth begin to appear [1]	Teething, chewing, possible gum soreness
7 months	All 42 permanent teeth usually present [1]	Adult dentition is complete
10 to 17 months	Most tooth apices closed on imaging [4]	Roots are maturing, age estimates get rougher
1 to 3 years	Mild tartar, minimal wear	Lower periodontal risk group [2]
4 to 7 years	More tartar, some gum inflammation	Middle age, watch for early disease
8 years and older	Heavy tartar, wear, possible tooth loss	Highest periodontal disease risk [2]

If you want to slow the changes in that chart, daily home care matters. See preventative dental care for dogs for brushing and product basics.

Senior Dog Teeth: What Changes With Age

Senior dogs are not just older versions of young dogs. Their mouths change in ways that affect eating, comfort, and overall health.

Wear and fractures

Years of chewing wear down enamel. Once dentin is exposed, teeth are more sensitive and more likely to fracture. A broken tooth with a dark spot or a wobbly fragment needs a vet look, not a wait-and-see approach.

Periodontal disease risk climbs

In a survey of 12,753 dog owners, overall periodontal disease prevalence was 50.5% [2]. Age was strongly associated with periodontal disease, with dogs 8 years and older at highest risk and dogs under 4 years at lowest risk [2]. Some breeds were at significantly increased risk, including American cocker spaniels [2]. That means your senior dog's dental exam is not optional. It is part of routine senior care, which you can read about in senior dog checkup: what should be included.

Roots and bone change

Older dogs often have bone loss around tooth roots. You cannot see this from the outside. Dental radiography is how veterinarians find it, and imaging choices affect what can be detected. Cone-beam computed tomography detected more imaging features of endodontal disease than intraoral dental radiography in one study [3]. If your vet recommends imaging, it is because the mouth hides a lot.

Anesthesia questions

Senior dogs can still have dental treatment, but the plan is individualized. Your veterinarian will weigh bloodwork, heart and lung status, and the severity of dental disease. Age alone is not an automatic disqualifier. The goal is to reduce pain and infection while keeping anesthesia as safe as possible.

Signs Something Is Wrong

Watch for these signs and act on them:

Bad breath that is stronger than usual
Dropping food, chewing on one side, or refusing hard kibble
Pawing at the mouth or rubbing the face
Swelling under the eye or along the jaw
Bleeding gums, loose teeth, or a visibly broken tooth
Weight loss or decreased grooming
Drooling more than normal

Dental pain in dogs is often quiet. A dog who still eats may still hurt. If you see several of these signs, book a veterinary dental exam. You can also read prevent dog dental disease for prevention steps between visits.

Common Mistakes When Estimating Age by Teeth

Mistaking tartar for age

Heavy tartar looks "old," but tartar builds fast in some dogs and slowly in others. Tartar is a disease sign, not a reliable age marker. Periodontal disease risk is tied to age, breed, oral diagnoses, symptoms, and home care habits [2]. Do not use tartar alone to guess a dog's birthday.

Trusting a single tooth

One worn canine does not tell you much. You need the full mouth, including the incisors, canines, premolars, and molars. Even then, the estimate is a range.

Assuming small breeds age the same way

Determining age in small and toy breeds by examining teeth is more difficult than in large dogs [1]. If you have a small dog of unknown age, expect a wider estimate.

Skipping the vet because the teeth "look fine"

Front teeth can look okay while roots and back teeth are diseased. Dental radiography and, in some cases, advanced imaging reveal problems that a visual check misses [3]. A wellness visit is the only way to know.

Waiting for obvious pain

Dogs hide oral pain well. By the time a dog stops eating, disease is often advanced. Routine exams catch problems earlier.

Supplies and Setup That Help

You do not need a clinic to do good home care. You need the right tools and a routine.

Dog toothbrush or finger brush. Soft bristles, sized for your dog's mouth.
Pet-safe toothpaste. Never use human toothpaste. Dogs swallow it, and some ingredients are not meant to be swallowed.
Dental chews or treats with a Veterinary Oral Health Council (VOHC) seal. These have evidence for reducing plaque or tartar.
A light and a helper. A small flashlight and a second person make mouth checks easier.
A written log. Note tartar, gum color, breath, and any dropped food. Bring it to visits.

If your dog hates brushing, start with a finger and toothpaste, then add the brush over weeks. Short, daily sessions beat long, occasional ones. For a full home-care plan, see preventative dental care for dogs.

Professional cleanings under anesthesia remain the standard for treating disease below the gumline. Home care slows buildup between cleanings, but it does not remove established tartar or treat infected pockets.

Limitations and When to Contact a Veterinarian

Estimating age from teeth has real limits. Dogs have short-crowned teeth, so age determination is less accurate than in species with continuously erupting teeth, and it relies mostly on eruption times and, subjectively, on root canal width seen on dental imaging [5]. For adult dogs, wear patterns give an estimate, not a fact [1]. Small and toy breeds are the hardest to age this way [1].

Contact a veterinarian based on what you see:

Same day: a suddenly swollen face, a broken tooth with exposed pulp, bleeding that will not stop, or a dog who cannot close the mouth.
Emergency now: trouble breathing, collapse, severe bleeding, or a jaw that looks fractured or misaligned.
Routine visit (within days to weeks): bad breath, tartar, gum redness, dropping food, chewing on one side, or a new lump in the mouth.
Senior routine: dogs 8 years and older should have a dental exam at least at their annual wellness visit, given their higher periodontal disease risk [2].

Individual cases need a veterinarian. A photo or a description cannot replace an exam, and treatment plans depend on your dog's health, not just the teeth.

Frequently Asked Questions

Can you really tell a dog's age by its teeth?

You can make a reasonable estimate in young dogs and a rough one in adults. Eruption timing is fairly predictable in puppies, while adult estimates rely on subjective wear patterns and are less accurate in small breeds [1].

Do senior dogs need dental cleanings under anesthesia?

Many do, and age alone does not rule it out. Your veterinarian will assess your dog's overall health and may recommend bloodwork or imaging before deciding, because untreated dental disease causes pain and infection.

Why does my older dog have loose teeth?

Loose teeth usually mean advanced periodontal disease with bone loss. This is common in senior dogs, and it needs a veterinary exam with dental radiographs to plan treatment [2].

Is bad breath just a normal part of aging?

No. Bad breath is a sign of dental disease or another health problem. Periodontal disease is common in dogs, and risk rises with age, so bad breath deserves a vet visit instead of acceptance [2].

How often should a senior dog see the vet for dental care?

At least once a year as part of a wellness exam, and sooner if you notice problems. Your veterinarian may recommend more frequent checks based on your dog's dental history, breed, and home care routine [2].

References

Dental Development of Dogs - Dog Owners. Merck Veterinary Manual.
Risk assessment of canine periodontal disease: insights from owner-reported health questionnaires. The Journal of small animal practice, 2026.
Evaluating cone-beam computed tomography vs. intraoral radiography for the detection of endodontal disease in dogs: diagnostic performance and inter-rater agreement. Frontiers in veterinary science, 2026.
Evaluation of Apical Closure Status of Canine, Maxillary Fourth Premolar, and Mandibular First Molar Teeth Using Retrospective Single-Time-Point Radiographic and Computed Tomography Data in Dogs. Journal of veterinary dentistry, 2026.
Estimation of Age by Examination of the Teeth in Animals - Digestive System. Merck Veterinary Manual.