dog shows teeth

Why Do Dogs Show Their Teeth?Why Do Dogs Show Their Teeth?

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You notice your dog curling his lip and exposing his pearly whites. Should you be concerned about this seemingly aggressive display? Not necessarily. There are several possible reasons dogs bare their teeth—some completely benign. Read on to understand the range of motivations behind your pooch flashing his fangs.


Snarling vs Smiling

The context around teeth exposure gives insight into your dog’s intentions:

Aggressive Snarl

Raised hackles/tensed body, direct stare/stillness, deep growl, ears back.

Happy Grin

Relaxed, wiggly body, squinty eyes, gentle panting, play bow initiation.

While both involve peeled lips and teeth, the vibe your dog gives off signals friendly or threatening intent.


dog shows teeth


Common Reasons Dogs Show Teeth

Here are typical motivations for canine tooth displays:


Dogs often display a brief “grin” as a submissive greeting gesture. The smile reassures newcomers they come in peace. It typically accompanies averted eyes, lowered head, and wagging tail.


During roughhousing or tug games, dogs will playfully flash their teeth as they nip and mouth toys or hands. This mimics acceptable social biting during puppyhood. Panted breathing confirms playful context.


Exposing teeth while growling expresses a warning to “back off.” Dogs use this threat display to establish boundaries and communicate displeasure before resorting to biting.


When cornered or fearful, dogs bare teeth as a protective reaction, attempting to look intimidating. This can progress to defensive biting if the perceived threat does not retreat.


Some excitable dogs flash a brief teeth grin when amped up or aroused, often while playing. It releases pent up energy but is not aggressive in context.


On a hot day, dogs may sit with their mouths open, exposing teeth. The increased air exposure helps regulate their temperature just like panting.


Dogs with mouth pain or dental problems sometimes show their teeth when eating or yawning. Infection and tooth fractures require veterinary dental care.


Dog shows teeth


Is My Dog’s Teeth Showing Problematic?

Regular tooth displays are only concerning if paired with true aggression like snapping, lunging, or biting. Signs it’s gone too far:

  • Bared teeth even when unprovoked
  • Approaching with tense body language
  • Lunging at or biting people or animals
  • Showing teeth over food or toys
  • Frequent hard biting during play

Consult an accredited trainer or veterinary behaviorist if your dog’s teeth displays seem problematic. With counterconditioning techniques, most dogs can learn better manners.


What Should I Do if My Dog Shows Teeth?

Your response depends on the context:

Happy greeting grin – Smile back and give affection to reinforce this polite gesture.

Playful biting – Redirect to chew toys and praise gentle mouthing. Withdraw attention for excessive roughness.

Warning – Respect their distance, avoid direct eye contact, and remove what’s causing their unease.

Fear/defense – Don’t punish or force contact. Wait patiently for them to relax and feel safe.

Arousal/excitement – Redirect their energy into a training session or game. Encourage settling.

Dental pain – Schedule a veterinary dental exam to address any underlying oral issues.

Knowing your dog’s cues helps differentiate between harmless teeth displays and problematic aggressive signaling that jeopardizes safety. When in doubt, consult an experienced trainer or behavior specialist for guidance. With understanding and early positive conditioning, you can teach appropriate “bite inhibition” and manners around showing teeth.


dog shows teeth


Why Does My Dog Show His Teeth When Playing?

  • It’s a form of friendly mock fighting dating back to puppyhood.
  • Mouthing and grinning helps dogs self-regulate arousal and build bonds.
  • Baring teeth adds fun through playful provocation.
  • It lets playmates know the dog is not intending real harm or aggression.



While flashing teeth can look scary, dogs bare their pearly whites for many harmless and endearing reasons too. Understanding your dog’s unique body language and situational triggers allows you to respond appropriately. Whether it’s just an excited grin or a serious warning sign requires reading the full context. With insight into this expressive behavior, you can address any concerning cases and appreciate the happy smiles!

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