How Long Do Puppies Bite and Teeth?

Name: How Long Do Puppies Bite and Teeth?
Creator: Dr. Zubair Khalid

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

Puppies bite and mouth because it is a normal part of how they explore the world and learn to use their mouths. Most puppies bite the most between about 8 and 16 weeks of age, and the behavior usually settles down as their adult teeth come in around 6 months. If you want to know how long do puppies bite, the honest answer is that the timeline depends partly on breed, partly on teething, and a lot on how consistently you teach bite inhibition.

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

Quick Answer

Puppies use their mouths and their needle-sharp teeth for play, chewing, and investigating objects, so biting and mouthing are normal behaviors [1].
Mouthing is usually most intense during the teething months, and it often looks much less cute by 3 or 4 months of age when the puppy is bigger and stronger [1].
Bite inhibition is the skill of controlling how hard the mouth closes, and it is the single most useful thing you can teach during this window [1].
Adult teeth typically arrive around 6 months, and permanent canine eruption is a reliable marker of that maturation stage in male dogs [2].
Chew toys help redirect oral behavior, and scented chew toys are commonly recommended to reduce unwanted chewing and mouthing [3].

Why Puppies Bite and Mouth

It is normal puppy behavior

Puppies spend a great deal of time playing, chewing, and investigating objects, and all of these normal activities involve using their mouths and their teeth [1]. When puppies play with people, they often bite, chew, and mouth on hands, limbs, and clothing [1]. That behavior may seem cute when your puppy is 7 weeks old, but it is far less endearing at 3 or 4 months old when the puppy is getting bigger by the day [1].

So yes, it is normal for puppies to bite. The question is not whether your puppy will mouth you, but how quickly you can teach gentle mouth use.

Teething drives a lot of it

Puppies go through teething as their baby teeth are replaced by adult teeth. The discomfort of erupting teeth pushes puppies to chew on whatever is available, including your hands, your sleeves, and your furniture. This is one reason the behavior peaks in the months before adult teeth are fully in place.

Dental development is closely tied to overall maturation. In male dogs, permanent canine eruption correlates with testosterone levels and testicular development, and it predicts pubertal status better than age alone [2]. In plain terms, the arrival of adult canine teeth is a meaningful milestone, not just a cosmetic change.

Breed and size can matter

Small and extra-small breeds have their own dental quirks. Extra-small breeds under 6.5 kg showed a significantly higher prevalence of persistent deciduous teeth (baby teeth that never fall out) at 15 percent, compared with all other breed sizes [4]. Persistent baby teeth are linked to malocclusion, soft tissue trauma, and a higher risk of periodontal disease [4]. If your puppy is a small breed, keep an eye on the tooth transition and ask your veterinarian to check the mouth at your wellness visits.

Medical Causes to Rule Out

Most puppy biting is behavioral, but a few medical issues can make mouthing worse or change how the mouth looks and feels.

Persistent deciduous teeth

When a baby tooth stays in place while the adult tooth tries to come through, the bite can shift and the mouth can become uncomfortable. Persistent deciduous teeth are associated with malocclusion, soft tissue trauma, and increased periodontal disease risk [4]. Your veterinarian can identify retained teeth during a routine oral exam.

Dental and skeletal anomalies

Some breeds have a higher rate of dental abnormalities. In a group of Yorkshire Terriers referred for dental consultation, researchers found shape abnormalities including microdontia, dilaceration, and fused roots, and eruption anomalies were significantly associated with malocclusion [5]. This does not mean every small dog will have these problems, but it does mean that unusual tooth alignment or missing teeth deserve a professional look.

Oral discomfort and early periodontal changes

Oral and dental diseases are among the most common problems seen in small-breed dogs, and some breeds show oral disease at an early stage [5]. Even young puppies can develop plaque and gingival changes. In a study of small breed puppies around 6 to 8 months old, plaque samples from healthy gingiva were dominated by gram-negative bacteria, mainly Proteobacteria, Bacteroidetes, and Fusobacteria [6]. That bacterial mix is a reminder that oral care should start early, not after problems appear.

If your puppy suddenly bites more, drools, chews on one side, or avoids hard food, book a veterinary oral exam.

When Puppy Biting Becomes a Problem

Biting is a problem when it hurts, breaks skin, or continues past the point where your puppy should be learning control. A puppy or dog who has not learned bite inhibition with people does not recognize the sensitivity of human skin, so he bites too hard, even in play [1].

There is a bigger reason to take this seriously. Some behaviorists and trainers believe that a dog who has learned to use his mouth gently around people will be less likely to bite hard and break skin if he ever bites in a situation outside of play, such as when he is afraid or in pain [1].

Watch for these patterns:

Biting that escalates when you reach for food, toys, or a collar
Growling, stiffening, or hard stares paired with biting
Biting that leaves bruises or breaks skin
Mouthing that gets worse instead of better after 5 to 6 months of age

Any of these deserve professional help, not more of the same home routine.

What to Do: Step by Step

Step 1: Teach bite inhibition early

Bite inhibition means teaching your puppy to control the force of his mouth [1]. Start while the teeth are still baby teeth and the pressure is mild. When your puppy mouths you, pause the interaction briefly, then resume. The goal is to teach that gentle mouth contact keeps the game going and hard contact ends it. Keep sessions short and repeat them many times a day.

Step 2: Redirect to appropriate chew items

Chewing and mouthing are natural oral behaviors in dogs, particularly during puppyhood, even though owners often report them as nuisance behaviors [3]. Providing appropriate enrichment items, such as scented chew toys, is often recommended to reduce these behaviors [3]. In one study, dogs interacted with both a non-scented rubber toy and a peanut butter-scented squeaker toy, and owners then reported on chewing and mouthing at home over a week [3]. The practical takeaway is simple: keep several safe chew options within reach and offer one the moment your puppy starts mouthing you.

Step 3: Build a routine that meets your puppy's needs

A tired, bored puppy bites more. Feed on a consistent schedule, and if you are still deciding how long to keep puppy food in the bowl, see How Long Should A Puppy Eat Puppy Food and How Long Should Dog Eat Puppy Food. Short training sessions, sniff walks, and puzzle feeders burn mental energy and reduce mouthy outbursts.

Step 4: Manage the environment

Keep hands and sleeves out of reach during excited play. Use a toy as a barrier between your hands and your puppy's mouth. Put away shoes, cords, and remote controls that invite chewing. If your puppy gets over-aroused, end the play session and give a short calm break.

Step 5: Practice handling and gentle mouth care

Touch your puppy's muzzle, lift the lips, and look at the teeth for a few seconds at a time, then reward. This makes future veterinary dental exams easier. It also helps you notice retained baby teeth or an odd bite early. For more hands-on strategies, see Puppy Training Tips Biting.

What Not to Do

Do not punish with physical force

Hitting, holding the mouth shut, or alpha rolling can increase fear and defensive biting. Punishment also does not teach the puppy what to do with his mouth instead.

Do not rely on myths

Myth: Puppies must be allowed to bite so they "learn it hurts." Reality: they learn bite inhibition through consistent feedback and gentle play, not through free access to human skin [1].

Myth: Biting stops on its own at a set age. Reality: the timeline varies, and without training, a puppy who has not learned bite inhibition may still bite too hard later, especially when afraid or in pain [1].

Myth: Baby teeth do not matter. Reality: retained baby teeth are linked to bite problems and periodontal disease, and extra-small breeds have a significantly higher prevalence of persistent deciduous teeth [4].

When to Involve a Veterinarian or Behavior Professional

Call your veterinarian if you see retained baby teeth, a misaligned bite, bad breath, drooling, or reluctance to chew. Ask about an oral exam at every puppy visit, especially if you have a small breed, since extra-small dogs under 6.5 kg show a significantly higher prevalence of persistent deciduous teeth [4].

Ask for a referral to a certified behavior professional if biting is causing injury, if your puppy shows fear or aggression during handling, or if the behavior is getting worse after 6 months of age. A dog who has not learned bite inhibition with people does not recognize the sensitivity of human skin and may bite too hard even in play [1].

Limitations and When to Contact a Veterinarian

This article covers general patterns. Individual cases need a veterinarian who can examine your puppy's mouth, bite, and overall health.

Contact your veterinarian the same day if your puppy has a swollen face, a broken or loose adult tooth, bleeding from the mouth that does not stop, or sudden refusal to eat.

Go to an emergency clinic now if your puppy has trouble breathing, a swollen throat, uncontrolled bleeding, or a suspected foreign object stuck in the mouth or throat.

Schedule a routine visit if you notice retained baby teeth after the adult teeth come in, a changing bite, persistent bad breath, or mouthing that is not improving with training.

Frequently Asked Questions

Is it normal for puppies to bite?

Yes, biting and mouthing are normal puppy behaviors. Puppies use their mouths to play, chew, and investigate objects, and this is a standard part of development [1]. The goal is not to eliminate mouthing overnight but to teach gentle mouth use.

How long do puppies teeth?

Puppies go through the baby-to-adult tooth transition over the first several months, with adult canine eruption serving as a reliable marker of maturation in male dogs [2]. Most owners notice the heaviest chewing during this transition. Your veterinarian can track the process at wellness visits.

How long do puppies mouth and bite?

Mouthing is usually most intense in the early months and tends to decrease as adult teeth settle into place. The behavior often looks much less cute by 3 or 4 months of age when the puppy is bigger and stronger [1]. Consistent training and chew toys shorten the timeline.

How long do puppies go through teething?

Teething overlaps with the period when baby teeth are replaced by adult teeth, and it is a major driver of chewing. Dental development tracks closely with physical maturation, and permanent canine eruption predicts pubertal status better than age alone in male dogs [2]. Expect the heaviest chewing during this window.

Do chew toys really reduce biting?

Chew toys give your puppy a legal outlet for natural oral behavior. Chewing and mouthing are natural in dogs, particularly during puppyhood, and providing appropriate enrichment items such as scented chew toys is often recommended to reduce these behaviors [3]. Keep several safe options available and rotate them to hold your puppy's interest.

References

Mouthing, Nipping and Biting in Puppies. ASPCA Animal Poison Control Center.
Linking Canine Teeth Eruption, Testicular Histology and Testosterone Levels as Indicators of Pubertal Maturation in Male Dogs. Anatomia, histologia, embryologia, 2026.
To chew or not to chew? Exploring the influence of scented chew toys on puppy chewing. Frontiers in behavioral neuroscience, 2025.
Persistent deciduous teeth: Association of prevalence with breed, breed size and body weight in pure-bred client-owned dogs in the United States. Research in veterinary science, 2024.
Longitudinal Evaluation of Permanent Dental Anomalies in a Group of Yorkshire Terriers Referred for Dental Consultation. Journal of veterinary dentistry, 2025.
Characterization of oral microbiota in 6-8-month-old small breed dogs. BMC veterinary research, 2024.