Why Does My Puppy Bite So Much? Causes Explained

By Tailwisp Editorial TeamUpdated October 17, 20263 min read

A puppy who bites seems to be misbehaving, but from the puppy's point of view, it is simply doing what puppies do. Understanding the reasons behind the biting helps you respond effectively, and not take it personally.

1. Exploration

Puppies do not have hands. Their mouths are how they investigate textures, tastes and objects. Your fingers, shoelaces and hair are fascinating items to explore.

2. Play

Puppies play by chasing, wrestling and biting. When they do this with littermates, the game ends when someone yelps. With people, they treat us like littermates unless we teach otherwise. Moving hands and wiggling toes are especially tempting.

3. Teething

From about three to seven months, puppies' gums are sore, and chewing and biting relieve discomfort. This often leads to a peak in mouthing. See our teething timeline.

4. Overtiredness

Puppies need 18 to 20 hours of sleep a day when young. If they miss naps, they become wired and mouthy, like a cranky toddler. Many owners notice that biting spikes in the early evening. A nap or calm chew often helps.

5. Overexcitement

Excitement from visitors, play or walks can overflow into biting. The puppy has not yet learned to regulate its emotions.

6. Attention seeking

If biting makes you react, with squealing, pushing or chasing, your puppy may learn that it is a great way to get attention. Even negative attention can be rewarding to a puppy.

7. Frustration

A puppy that cannot reach something or is denied something it wants may bite or nip out of frustration. Giving a puppy an outlet, such as a toy to tug, helps.

8. Hunger and thirst

A hungry puppy may be more irritable and mouthy. Regular meals can help.

9. Lack of exercise or stimulation

A bored puppy finds its own entertainment, and biting hands is entertaining. Make sure your puppy has enough physical and mental activity.

Normal biting vs warning signs

Normal puppy biting is usually:

• Loose, wiggly body language
• Play bows and bouncy movements
• Mouthing that varies in intensity
• Often triggered by play or excitement

Seek professional help if biting comes with:

• A stiff, frozen body or hard stare
• Growling, snarling or lifted lips
• Guarding food, toys or objects
• Biting hard enough to draw blood repeatedly
• Biting in response to being handled, such as touching paws or collar
• Sudden, intense biting that seems out of character

Our guide to when to see a dog behaviorist explains who to call.

What you can do

• Redirect to appropriate toys, and reward.
• Pause play when teeth touch skin.
• Provide naps and a calm environment.
• Meet exercise needs.
• Keep play gentle, and avoid games that encourage biting.

Our guide to how to stop puppy biting and mouthing gives detailed steps. See also puppy zoomies explained for the energy bursts that often come with biting.

How long will it last?

Most puppies show real improvement by four to six months, though you may see temporary increases during teething and adolescence. With consistent training, biting should fade as your puppy matures.

Keeping a biting diary

If you cannot work out why your puppy bites, keep a simple diary for three days. Write down the time, what happened just before and what your puppy did. You will often see a pattern: biting spikes thirty minutes after a missed nap, or whenever a certain person arrives, or when you stand up from the sofa. Once you know the trigger, you can prevent it by adjusting naps, giving a chew in advance or asking visitors to greet calmly. Prevention does more than correction, because every time your puppy practices biting, the habit gets stronger.

The takeaway

Biting is a normal part of puppyhood, driven by exploration, play, teething and tiredness. Understand the triggers, respond calmly and consistently, and your puppy will learn to use its mouth gently.