In this article

1. Teeth are only part of the explanation
2. What to do when teeth meet skin
3. Reward the moments you want more of
4. Make resting possible
5. Keep teaching gentle
6. Give children a practical safety plan
7. Progress and the point to get help

The puppy you imagined was asleep in a sunbeam. The one currently attached to your trouser leg has other projects. Mouthing is a normal part of puppy development, and it can hurt. Dogs Trust advises meeting the puppy's needs and offering appropriate outlets, while recognising that fear, frustration or pain may also be involved.¹

The useful question is what happens just before those teeth appear, and what you can arrange next time. This guide is for everyday puppy mouthing. You do not have to decide alone whether a worrying incident still belongs in that category.

Teeth are only part of the explanation

PDSA explains that baby teeth begin falling out at around four months, with a full adult set usually present by about six months. That dental timetable gives useful context, but it does not tell you why a puppy bit during one particular interaction. A mouth can be busy for several different reasons.³

Battersea lists exploring, playing, teething, excitement and frustration among the reasons puppies mouth. Some use their mouths to avoid handling they find difficult. Notice whether the incident followed a lively greeting, a brush approaching the coat or a game that became too exciting. The same-looking nip can have a different setting.²

Try a short note after an awkward moment: where were you, what was happening, and what did your puppy do next? You are collecting a description, not awarding a personality trait. It is easier to discuss a puppy who grabs sleeves during the evening greeting than one labelled a tiny menace.

What to do when teeth meet skin

Battersea recommends staying calm, keeping hands still and pausing the interaction. Pulling away rapidly can encourage more mouthing. Offer an appropriate toy before predictable nippy moments, and avoid rough, hands-on wrestling. If redirection does not help, briefly step away behind a gate or into another room and return when the puppy is calm.²

A calmer response

1. Pause your movementGive the puppy less moving skin or clothing to chase.²
2. Offer an appropriate outletKeep a suitable toy within reach.²
3. Create space if neededBriefly remove yourself safely and return calmly.²

This is easier to read than to do while teeth are in your sleeve. Arrange the room while your puppy is resting, so the toy and the gate are useful before the next event. Treat it as a household arrangement that needs to work when you are tired, too.

Reward the moments you want more of

Dogs Trust describes rewards as things an individual dog wants, delivered for behaviour you like. Choose something that suits the moment: a quiet fuss may suit calm behaviour, while a game may suit an active response. When a skill is new, reward each success while your dog learns what works.⁴

For instance, you might reward a puppy who has chosen their toy during a greeting, or who stands with paws on the floor while you put your coat away. These are suggested examples of applying that principle. You are giving the puppy a useful answer to the question of what to do with themselves.⁴

Training food belongs within the day's intake. Dogs Trust recommends reducing food at mealtimes to account for treats, using safe food in small pieces and choosing a reward the dog enjoys. There is no requirement to buy an elaborate snack collection before you can notice a sensible choice.⁴

Make resting possible

Dogs Trust gives around 18 to 20 hours a day as puppy sleep guidance. It also warns that overtired puppies may look increasingly lively and mouthy. That is a guide, not a target to enforce with a stopwatch. Balance activity with opportunities to rest, especially after an exciting part of the day.¹

A pen or crate needs a positive introduction before it becomes a useful resting place. Dogs Trust recommends a quiet position, comfortable bedding, water and enough space for normal movement. Let the puppy investigate with the door secured open at first. Being put inside an unfamiliar enclosure is not a shortcut to feeling comfortable there.⁵

Build the association with pleasant experiences and allow easy exits during early introductions. Progress at your puppy's pace. Dogs Trust advises practising when the puppy is naturally readier to relax and making entry easier if they hesitate. A gate or pen is useful only when the setup works for the puppy as well as the people.⁵

Your practical aim might be a quieter patch of the afternoon, with the phone put down and the household leaving the bed alone. This is a suggested planning exercise, not a promise that one nap will solve the evening. It gives you something kinder and more manageable to try than adding another frantic game.

Keep teaching gentle

There is evidence for considering welfare when choosing training methods. A Portuguese study recruited 92 dogs from seven training schools. Dogs attending the schools using more aversive methods showed more stress-related behaviour during training than dogs at reward-based schools; the aversive group also had a larger post-training cortisol increase.⁶

Owners had already chosen their schools, so allocation was not random and differences between groups could contribute. This was not a trial of puppy-biting treatments. It cannot tell you which toy or pause will work fastest, but it gives no reason to escalate into frightening or physically correcting a mouthy puppy.⁶

Give children a practical safety plan

The RSPCA advises never leaving a child alone in a room with a dog, including the family dog. Children need help recognising when a dog wants space. Keep them away when a dog is eating, enjoying a valued toy, asleep, unwell or tired, and provide a quiet resting spot that children leave alone.⁷

An adult should organise the situation; a child's ability to stand still should not be the household safety system. Decide in advance who takes over if play becomes uncomfortable. Giving everyone a clear job is more useful than hoping a young child remembers a long list while a puppy dances around their socks.

Progress and the point to get help

Battersea says many puppies begin growing out of mouthing around five to six months, with some taking longer.²

Dogs Trust describes much less mouthing after teething, around seven months, and stresses that there is no magic age. The direction of change matters more than reaching a birthday: look for episodes becoming easier to manage and less intense.¹

Ask your vet about mouth discomfort, difficulty eating, dropped food, swelling or a broken tooth. PDSA notes that dogs can continue eating despite dental pain, and a full examination may be needed when looking inside is uncomfortable. Do not prise a reluctant puppy's mouth open to establish your own diagnosis.³

For aggression, worsening anxiety or a sudden behaviour change, arrange a vet assessment and qualified behaviour support. The RSPCA recommends checking health first and obtaining a behaviourist referral. It also warns that punishing warning signals can increase threat and lead to more serious aggression. Do not keep testing a situation that feels unsafe.⁸

You can take an ordinary mouthy phase seriously without deciding your puppy is difficult by nature. Aim for a home with useful toys, space to rest and adults who know what they will do next.

Sources and further reading8 sources

The small numbers in the article link to the source behind each fact. Sources open on their own websites.

1. Mouthing, nipping and puppy biting: causes and how to stop it safelyDogs Trust
2. How to stop a puppy mouthing or bitingBattersea Dogs & Cats Home
3. Dental disease in dogsPDSA
4. Positive reinforcement – training with rewardsDogs Trust
5. Playpen and crate training a puppyDogs Trust
6. Does training method matter? Evidence for the negative impact of aversive-based methods on companion dog welfarePLOS ONE
7. Dogs and childrenRSPCA
8. Aggression in dogsRSPCA