Why Does My Puppy Bite Everything — Teething or Play?

A four-month-old puppy chewing furiously on a toy and the same puppy mouthing your hand mid-play can look like the exact same behavior — teeth everywhere, all the time. They're actually driven by two different things, and treating them the same way usually doesn't fully solve either one.

The misconception: it's all "just teething"

It's an easy assumption: puppies bite, puppies are teething, so the biting must be teething and will stop once the adult teeth are in. That explains the chewed table leg, but it doesn't explain why the same puppy mouths hands, sleeves, and shoelaces during play — a habit that can outlast teething by months if it's never specifically addressed. The two behaviors get lumped together because they overlap in timing, not because they share a cause.

Why teething and play biting are actually separate problems

Teething is a physical process: puppies lose their deciduous ("baby") teeth and grow in permanent ones over roughly the first six months, with the heaviest discomfort typically around three to six months as adult teeth push through sore gums. That soreness drives a genuine urge to chew on objects — it's relief-seeking, not misbehavior, and it's aimed mostly at things, not people.

Play biting, or mouthing, is a separate, social behavior. Puppies use their mouths to investigate the world and to play with littermates, and it's through play with siblings that they normally learn bite inhibition — a littermate yelps and pulls away when bitten too hard, and the biter learns to soften up. Many puppies come home to a new family around eight weeks, right as that lesson is still being learned, which means the human household has to pick up where the litter left off rather than assume it's already handled.

Because both behaviors peak in the same few months of a puppy's life, owners naturally read them as one thing. They're not: teething calls for the right objects to chew on, while mouthing calls for behavioral redirection and continued bite-inhibition training — treating a mouthing habit as "just teething that will pass" often means it doesn't get addressed at all.

The actual fix: match the response to the cause

• For teething, offer a rotation of textures — a damp washcloth frozen solid, rubber teething toys, appropriately sized chews — and supervise so hard chewing doesn't damage the incoming adult teeth.
• For mouthing, the instant teeth touch skin, stop the interaction: a short "ouch," withdrawing your hand and attention for a few seconds, mimics the feedback a littermate would have given.
• Redirect to an appropriate toy immediately after the pause, rather than just pulling away and hoping the puppy figures it out.
• Keep the whole household consistent — if one person allows hand-wrestling and another doesn't, the puppy gets mixed signals and the habit takes longer to fade.
• Watch for over-arousal. Overtired or overstimulated puppies bite harder and more often; a short break or calmer activity often works better than continuing to play through it.

FAQ

Should I use physical correction, like grabbing the muzzle or a light tap, to stop biting?
It's best avoided — physical correction can suppress the visible mouthing without addressing the arousal or fear underneath, and in some puppies it increases fear-based biting later rather than reducing it.

My puppy's teething chews look chewed to shreds, is that a problem?
Normal wear on an appropriate chew toy is expected. Swap out anything that's splintering, has come apart into swallowable pieces, or has visibly sharp broken edges.

Most mouthing fades with consistent redirection over the following weeks as bite inhibition improves alongside the teething process finishing. Biting that's disproportionately hard or frequent, doesn't improve with a few consistent weeks of redirection, or comes with growling and other signs beyond normal play is worth a vet or veterinary behaviorist visit — and any adult dog that suddenly starts mouthing or biting when it never did before should also be checked for pain, since dental disease and other physical discomfort can show up first as a change in biting behavior.