How to Stop a Dog From Biting: Puppies and Adults

“Biting” covers two very different things: a puppy chewing on your sleeve because they’re excited, and a dog who snaps when you reach for their food bowl. The first is a normal behavior that needs better outlets. The second is communication that something is wrong. This guide helps you tell them apart and explains what to do about each.

Why do dogs bite and mouth?

Dogs explore the world with their mouths, the way young children use their hands. Puppies also play by mouthing each other, and they learn how hard is too hard from their littermates’ reactions. When a puppy comes home, that play gets directed at people.

Bites that come with warning signs are different. Dogs bite when they feel threatened, are in pain, are guarding something valuable, or have been pushed past their limits. The table below shows the main differences.

	Play mouthing	Warning or defensive biting
Body language	Loose, wiggly, play bows, bouncing	Stiff body, freezing, hard stare, lip lifted, ears back
Sounds	Play growls during games	Low growl, snarl, snap
When it happens	During play, greetings, excitement, when overtired	When touched, handled, cornered, near food or toys, or when scared
Pressure	Usually soft, sometimes hard nips from puppies	Often sudden and harder, may bruise or break skin
What to do	Redirect, pause play, rest, teach alternatives	Stop, create distance, get a veterinary check and professional help

How to stop play mouthing: step by step

These steps are for normal puppy and adolescent mouthing. If you’re seeing any of the warning signs in the right-hand column above, jump to the section on getting help.

Step 1: Put toys everywhere

Keep a tug toy, chew or soft toy within reach in every room you use. The goal is to have something to offer the instant your dog reaches for skin or clothes, so the right choice is easy.

Step 2: Make teeth on skin end the fun

When teeth touch your skin, let your hand go limp and stop the game. The ASPCA suggests a brief time-out of 10 to 20 seconds for hard bites, and later, once bites are gentler, 30 to 60 seconds away from your puppy whenever teeth touch skin. Then restart the game with a toy. Your dog learns that teeth on toys keep play going and teeth on people pause it. The ASPCA also advises against jerking your hands away, which encourages a puppy to jump forward and grab.

Step 3: Protect naps

The AKC notes that sometimes a biting puppy is really an overtired puppy who needs a nap in a quiet space, or simply a potty break, food or water. The AKC says puppies usually sleep 18 to 20 hours a day and are most likely ready for a nap after playtime or a walk, so plan active time followed by quiet time in a crate, bed or quiet corner with a chew. Watch whether your puppy is calmer after a nap; if so, build regular naps into the day.

Step 4: Teach something to do instead

1. Hand touch. Hold your flat palm near your dog’s nose and reward them for bumping it.
2. Sit for attention. Reward a sit when your dog greets you, instead of mouthing hands or jumping.
3. Gentle licks and calm contact. Calmly praise relaxed, gentle behavior when you stroke your dog.

Step 5: Play games that keep teeth on toys

Choose games where your hands stay out of the action. The ASPCA recommends noncontact play such as fetch instead of wrestling and rough play with hands. Trade games work well too: VCA Animal Hospitals suggests playing with two toys of equal value and switching your attention from one to the other, so your dog learns to let go of one toy to get the next. We leave tug-of-war out of this plan on purpose: the American Veterinary Medical Association advises avoiding highly excitable games like wrestling or tug-of-war, which can increase the risk of a nip or a bite. The AKC’s guide to puppy biting also recommends chew toys and training alongside teaching bite inhibition.

Teaching bite inhibition: the two-phase method

Bite inhibition is a dog’s ability to control the force of their mouth. The ASPCA explains that puppies usually learn it from each other: when one bites too hard, the other yelps and stops playing for a moment. Its method copies that lesson in two phases. First you teach your puppy to bite more gently, and only then to stop putting teeth on skin at all.

Phase 1: reduce the force

1. Play with your puppy and let them mouth your hands.
2. When a bite is especially hard, give a high-pitched yelp and let your hand go limp. Praise your puppy for stopping or licking, then carry on playing.
3. Yelp no more than three times in 15 minutes. If it isn’t working, switch to a time-out: after a hard bite, remove your hand and ignore your puppy for 10 to 20 seconds, or get up and move away for 10 to 20 seconds if they keep mouthing. Then invite them to play again.
4. As the hardest bites disappear, tighten the rule: respond the same way to moderately hard bites, then to the next hardest, and so on.

When to move on: the ASPCA’s signal is when your puppy can play with your hands very gently, so that you feel little or no pressure at all.

Phase 2: reduce the frequency

1. Now give a time-out every time you feel teeth on your skin, not just for hard bites. Walk away and ignore your puppy for 30 to 60 seconds. If they follow you and keep nipping, leave the room for 30 to 60 seconds (make sure the room is puppy-proofed first).
2. Or keep a light leash on your puppy while you supervise, and use it to lead them calmly to a quiet spot for the time-out instead of leaving the room.
3. Offer a toy or chew whenever your puppy reaches for fingers or toes, and keep plenty of interesting toys around.

If your puppy gets more excited: the ASPCA’s alternative to yelping is the time-out, and it advises against jerking your hands or feet away, which invites more grabbing. If your puppy stiffens, freezes, pulls their lips back, growls or bites much harder than in normal play, the ASPCA describes that as a temper tantrum rather than play. Stay calm, don’t yelp, and plan to contact a qualified professional, because repeated biting out of frustration isn’t something puppies simply grow out of.

What to do in common biting situations

• Biting ankles and feet as you walk. The ASPCA suggests carrying a favorite toy in your pocket. When your puppy ambushes your feet, stop moving, wave the toy, and start walking again once they grab it. If you don’t have a toy, freeze until they stop, then praise and reward with a toy.
• Biting the leash. The AKC says some dogs bite the leash because they don’t yet understand walking on one, or out of frustration at being held back. Reward the behavior you want whenever the leash is on, keep the leash loose, and give your dog a ball or toy to carry on the walk. Our loose-leash walking guide covers the walking side.
• Biting when picked up. The ASPCA notes that simply holding a puppy still or handling their body can trigger a temper tantrum. Stay calm and don’t yelp, and if it happens repeatedly, get professional help. VCA Animal Hospitals notes that desensitization and counterconditioning can change a fearful response to handling, including lifting.
• Biting during petting. The ASPCA notes that puppies often mouth hands when stroked, unless they’re sleepy or distracted. If your puppy gets riled up, feed small treats from your other hand while you pet, so they get used to touch without mouthing.
• Evening “zoomies”. Cornell University’s College of Veterinary Medicine calls them frenetic random activity periods, or FRAPs. They’re most common in puppies and young dogs and often happen late in the evening or when a dog is overstimulated. Keep a zooming dog away from stairs, slippery floors and obstacles, and if they happen often, add exercise and mental stimulation earlier in the day. Our puppy training guide covers daily routines.

Management while you train

Management keeps your puppy from practicing biting while the training catches up:

• Baby gates or a crate. When you can’t supervise, Humane World for Animals suggests a small, puppy-proofed area blocked off with baby gates, or a crate.
• A light leash indoors. Humane World for Animals suggests tethering a young puppy to you, or to a nearby piece of furniture, with a 6-foot leash when you aren’t actively playing or training. The ASPCA also uses a trailing leash, only while you’re there to supervise, for calm time-outs.
• A toy always within reach. The ASPCA suggests keeping a toy in your pocket so you can redirect the moment teeth come out. Ideally your puppy starts to look for a toy when they feel like mouthing.
• A nap routine. The AKC recommends planning active time followed by quiet time, and guiding an overtired puppy to their crate or sleeping place to wind down.

A sample puppy day

There is no single ideal schedule: your puppy’s age, sleep and bladder set the pace. Use this as a template and adjust it. The AKC says puppies usually sleep 18 to 20 hours a day and may nap every hour or so, for 30 minutes to two hours. Humane World for Animals recommends potty breaks at least every two hours, and especially after waking, after play and after eating or drinking. It adds that a puppy can generally hold their bladder for about one hour per month of age.

Time	Activity	Nap	Potty break
Example: 7:00 a.m.	Wake up, breakfast from a food puzzle	No	Yes, right after waking and after eating

Copy the table and fill in your own day. If biting ramps up at the same time each day, check what came just before it, such as a missed nap or a long stretch of play, since the AKC notes that a biting puppy is sometimes simply overtired.

Common mistakes

• Playing with hands. Wrestling or letting a puppy chew fingers teaches that hands are toys.
• Physical punishment. Tapping the nose, holding the mouth shut or rolling the dog over can make dogs fearful of hands. The AVSAB recommends reward-based methods for all training.
• Inconsistent rules. If one family member allows mouthing, the lesson gets muddled.
• Too much excitement, too little sleep. The AKC notes that sometimes a biting puppy is really an overtired puppy, and that too much stimulation and exhaustion can lead to unwanted behavior.
• Ignoring warnings. Punishing a growl can remove the warning without fixing the reason for it, so a dog may bite without warning later.

How biting changes with age and breed

Puppies mouth a lot as they explore, play and teethe. Offer a variety of chews, including ones that can be chilled. The AKC’s chief veterinarian advises that if you haven’t been able to moderate play biting by about 6 months of age, it’s a good idea to consult an experienced dog trainer or animal behavior specialist.

Adolescents (about 6 to 18 months) may mouth when excited or frustrated. More exercise, sniffing time and impulse-control games help.

Adults who mouth hard in play may never have learned bite inhibition with people: the ASPCA explains that such dogs don’t recognize how sensitive human skin is, so they bite too hard even in play. Adult dogs who snap or bite in specific situations need a veterinary check and professional help rather than a mouthing plan.

Match outlets to what your dog was bred for. Retrievers such as Labradors were bred to carry game, so give them things to carry and fetch. Herding breeds such as Border Collies and German Shepherds were bred to control moving animals, so if your puppy targets feet, use the feet-and-ankles routine below and give them focused training games. All puppies need plenty of appropriate chews.

Preventing bites around children and visitors

The American Veterinary Medical Association’s bite prevention advice for families includes:

• Always supervise young children around dogs, no matter how well behaved either is, and never leave a baby or small child alone with a dog.
• Never disturb a dog that is eating, sleeping or caring for puppies.
• Teach children to ask the owner’s permission before petting any dog.
• Manage introductions carefully, and consider waiting until children are older than 4 before adopting a new dog.
• Set up a delivery area your dog can’t get to.

Adult dogs: warning signs before a bite

The ASPCA explains that dogs rarely bite without some kind of warning, even if it lasts only milliseconds. A dog showing aggression to people usually shows some part of this sequence, from least to most intense:

1. Becoming very still and rigid
2. A guttural, threatening bark
3. Lunging or charging without contact
4. Mouthing to move or control the person, without real pressure
5. A “muzzle punch” with the nose
6. Growling
7. Showing teeth
8. Snarling (growling and showing teeth together)
9. Snapping
10. A quick nip that leaves no mark
11. Bites of increasing severity, from a quick bite that tears the skin to bruising, puncture wounds and repeated bites

Dogs don’t always follow this order, and they often show several signs at once. The ASPCA adds that dogs who warn before they bite give people time to retreat, which is why a warning should never be punished.

Staying safe while you wait for professional help

This guide doesn’t teach aggression treatment. That needs your veterinarian and a qualified behavior professional, who can see your dog in person. Until then:

• Avoid the triggers you know about. If your dog growls when you reach for their bowl or when they’re touched in a certain way, stop doing it for now.
• Keep children separate. The AVMA advises always supervising young children around dogs and never leaving a baby or small child alone with a dog. With a dog who has warned or bitten, keep them physically apart with gates or doors.
• Don’t punish growling. Punishing a growl can remove the warning without changing the reason for it, so the next time your dog may skip straight to biting.
• Keep a record. A written log of each incident helps your veterinarian and behavior professional see patterns:

Date	Situation	Just before	Warning signs seen	Intensity	What you did
Example: Sat 6:30 p.m.	Reached for a chew in the dog’s bed	Dog chewing, lying down	Froze, hard stare, growl	Growl only, no contact	Stepped back and left the dog alone; booked a vet visit

For intensity, you can use the steps in the ASPCA list above, for example “stiffened and growled” or “snap, no contact.”

When to get professional help

Contact your veterinarian first if your dog growls, snaps or bites. The ASPCA notes that some behavior problems are caused or made worse by physical problems, and only a veterinarian can diagnose them. Then look for a qualified behavior professional. The ASPCA describes the main options: board-certified veterinary behaviorists, certified applied animal behaviorists, and certified trainers or behavior consultants. Until you have help, avoid the situations that trigger biting and don’t try to “test” your dog.

For puppies, biting often overlaps with other early-life training. Our puppy training guide covers naps, socialization and first cues.