Dogs grind their teeth for several possible reasons, ranging from mouth pain and dental problems to stress and, less commonly, neurological conditions. The behavior is called bruxism, and it typically sounds like a squeaky or crunching noise. You may also notice your dog clenching its jaw with little visible movement. Occasional grinding isn’t always cause for alarm, but persistent or frequent grinding usually signals something worth investigating.
What Teeth Grinding Looks and Sounds Like
Canine bruxism involves involuntary clenching or grinding of the teeth, sometimes with side-to-side jaw movement. The most noticeable sign is the sound: a distinctive squeaky or crunching noise that’s hard to miss once you’ve heard it. Some dogs grind loudly enough to hear from across the room, while others do it more subtly. You might catch your dog clenching or thrusting its lower jaw with minimal visible motion. It can happen while your dog is awake, asleep, or both.
Dental Pain and Mouth Problems
The most common trigger for teeth grinding in dogs is discomfort in the mouth. Periodontal disease, fractured teeth, and misaligned bites (malocclusion) can all cause a dog to grind. When teeth don’t line up properly, the constant contact between opposing surfaces creates irritation that leads to repetitive grinding. A cracked or infected tooth may produce a similar response as the dog unconsciously works its jaw in reaction to pain.
Periodontal disease is especially worth considering because it’s widespread in dogs and easy to overlook. Signs include bad breath, drooling, pawing at the mouth, reluctance to chew toys, bleeding from the gums, and changes in eating habits. Some dogs start carrying food away from the bowl and dropping it on the floor before eating, or they take noticeably longer to finish meals. Others become withdrawn or irritable. Any of these alongside grinding points strongly toward a dental issue.
Stress and Anxiety
In otherwise healthy dogs, teeth grinding has often been interpreted as a stress-related behavior, similar to the way some people clench their jaws when anxious. Sheep, for example, grind their teeth during stressful handling, and horses develop similar repetitive oral behaviors. Dogs may grind in response to environmental changes, separation anxiety, boredom, or chronic stress. If the grinding started around a move, a new pet in the house, changes in routine, or periods when your dog is left alone for long stretches, anxiety could be the driver.
That said, the connection between stress and bruxism in dogs hasn’t been as rigorously studied as it has in humans and other species. It’s reasonable to consider stress as a factor, but it shouldn’t be the assumed explanation without first ruling out physical causes.
Gastrointestinal Discomfort
Dogs sometimes grind their teeth in response to nausea or abdominal pain. Acid reflux, stomach inflammation, and other GI issues can trigger the behavior. If you notice grinding alongside vomiting, decreased appetite, lip-licking, excessive swallowing, or a generally unsettled demeanor, digestive discomfort may be at play. This is one of the easier causes to overlook because the connection between the gut and the jaw isn’t intuitive, but it’s well recognized in veterinary practice.
Neurological Causes
Less commonly, teeth grinding can be a sign of a problem in the brain. A study published in the Journal of Veterinary Internal Medicine documented bruxism as a clinical sign of forebrain disease in dogs, noting that grinding can result from structural brain lesions. Conditions like brain tumors, inflammation of the brain (encephalitis), seizure disorders, and the aftereffects of head trauma have all been linked to bruxism in both humans and animals. Disruptions in the brain’s chemical signaling systems can also cause grinding without any visible structural damage.
Neurological grinding tends to look different from dental or stress-related grinding. It’s often more persistent and involuntary, and it may appear alongside other subtle signs like changes in behavior, confusion, circling, head pressing, or altered coordination. If your dog’s grinding is new, frequent, and accompanied by any of these signs, a neurological cause becomes more likely.
What Chronic Grinding Does to Teeth
If grinding continues long enough, it physically wears down the teeth. Affected teeth appear shortened and flat on top. When the wear happens gradually, the body has time to lay down a protective layer of reparative tissue inside the tooth, visible as a tan-to-brown spot in the center of the worn surface. This is the body’s attempt to shield the sensitive inner pulp.
Rapid or aggressive grinding doesn’t give the tooth time to protect itself. The pulp canal, the soft tissue inside the tooth containing nerves and blood vessels, can become exposed. This leads to significant pain, infection, inflammation of the pulp, tooth discoloration, and eventually tooth death. Once the pulp is compromised, the tooth typically needs professional treatment or extraction.
How Vets Find the Cause
Diagnosing the reason behind teeth grinding usually starts with bloodwork and a thorough oral exam, often under sedation so the vet can get a clear look at every tooth and the gum tissue. In one documented case, a dog’s bloodwork and sedated oral exam both came back normal, meaning the grinding wasn’t caused by anything detectable in the blood or visible in the mouth. That dog was then referred for brain imaging, which ultimately revealed a neurological cause.
The typical path looks like this: your vet will check for the most common explanations first, including dental disease, malocclusion, signs of GI distress, and evidence of pain elsewhere in the body. If nothing turns up, the next step may involve imaging of the skull or brain, along with other specialized tests. The diagnostic process narrows from broad to specific, starting simple and escalating only if the straightforward answers don’t fit.
Treatment Depends on the Cause
Because grinding is a symptom rather than a disease on its own, treatment targets whatever is driving it. A dog grinding due to a fractured tooth or periodontal disease will likely need dental work, whether that’s a repair, deep cleaning, or extraction. If misaligned teeth are causing chronic contact, orthodontic intervention or selective extraction can resolve the friction.
For stress-related grinding, the approach shifts to behavioral management. Increasing exercise, providing more mental stimulation, reducing known stressors, and in some cases working with a veterinary behaviorist can all help. Dogs with separation anxiety may benefit from structured desensitization training.
When grinding stems from pain, whether in the mouth, gut, or nervous system, pain management becomes central. Veterinarians may use medications that calm overactive nerve signaling, which can be especially helpful when the pain has a neuropathic component. These drugs work by dampening the way nerves transmit pain signals, and they’re often used alongside other therapies rather than on their own. GI-related grinding typically resolves once the underlying stomach or intestinal issue is treated with dietary changes or medication.
Neurological causes require the most specialized care. Treatment depends entirely on the specific brain condition involved and may range from anti-seizure medication to surgery, depending on what imaging reveals.
What to Watch For at Home
Pay attention to when the grinding happens. Does your dog grind while eating, while resting, during stressful situations, or seemingly at random? Note whether it’s getting more frequent or intense over time. Look for accompanying signs: changes in appetite, drooling, head shaking, swelling around the face, unusual behavior, or difficulty picking up food. These details help your vet zero in on the cause much faster. A short video of the grinding, captured on your phone, can be especially useful since dogs don’t always perform the behavior on cue during an exam.