Teeth grinding in dogs, known clinically as bruxism, is not a habit and it is not a dream. In dogs it most often signals pain, usually from the mouth or from the digestive tract, and occasionally from a neurological cause. A dog grinding their teeth at night needs a veterinary examination rather than a behavioural explanation.
What grinding sounds and looks like
Owners usually describe a dry, gritty, clicking or crunching sound, sometimes accompanied by a small sideways movement of the lower jaw. It often happens when the house is quiet, which is why it gets noticed at night, and it may be paired with chattering, repeated swallowing, lip licking or drooling. Some dogs grind while lying down and apparently relaxed.
The quiet of night explains why owners hear it then rather than why it happens then. A dog grinding at three in the morning is very likely grinding during the day as well, in a house with a television on and traffic outside. That distinction matters, because it removes the temptation to look for a night specific cause.
It is also worth separating grinding from two things it is not. Chattering teeth in a cold dog or an excited one is a rapid, tremulous movement rather than a grinding pressure. Jaw movements during deep sleep, alongside twitching paws and soft vocalisations, are ordinary sleep activity. Sustained, pressured grinding is a different event.
Oral pain is the first place to look
Anything painful in the mouth can produce bruxism, and the list is long: advanced gum inflammation, a fractured tooth, a tooth that has died and become infected, an ulcer, something lodged between teeth or across the palate, a growth, or a problem with the jaw joint or the muscles that work it. Malocclusion, where teeth meet abnormally, can cause a lower canine to strike the roof of the mouth, which is both painful and easy to miss.
A dog in oral pain generally will not tell you plainly. They keep eating, they stay affectionate, and the only clues may be indirect: chewing on one side, dropping food, new bad breath, reluctance to take hard treats, drooling, pawing at the face, or a dog who has become a little withdrawn. Merck's owner facing summary of dental disorders in dogs is a useful primer on how quietly these problems develop.
The examination for this is not a glance in the consulting room. A proper assessment usually means general anaesthesia, a tooth by tooth chart, and full mouth radiographs, because the structures that hurt most often sit below the gum line where nothing is visible.
The gut is the other main suspect
Nausea provokes jaw movements in dogs, and grinding sits in the same family of behaviours as lip licking, repeated swallowing, excessive drooling, air licking and grass eating. A dog with reflux, gastritis, an ulcer, pancreatitis or an abdominal problem may well grind, and the pattern is sometimes worse at night or in the early hours when the stomach has been empty for a long stretch.
That timing detail is genuinely useful. Grinding that clusters in the small hours, improves after breakfast, and comes with morning retching or bringing up yellow bile is a pattern that points toward the digestive tract rather than the mouth. Tell your veterinarian if you have noticed it, because it changes the direction of the workup.
Foreign material is worth naming separately. A stick fragment wedged across the palate, a piece of bone jammed between two molars, or something stuck at the back of the mouth produces sudden grinding, gagging and pawing, and it is an urgent problem rather than a scheduled one.
Where the causes sit
Stress appears at the bottom of that table for a reason. It is a genuine contributor in some dogs, and it is also the explanation owners reach for first because it requires no appointment. Treating grinding as anxiety without excluding pain is the error this article exists to prevent, and it is worth noting that pain itself makes dogs anxious, so the two are not cleanly separable.
What the veterinarian will want to know
Come to the appointment with specifics rather than impressions. When did it start, and did anything change around that time? How often does it happen, and at what times of day? Is your dog eating normally, and have they changed which side they chew on? Any vomiting, reduced appetite, weight change, drooling or bad breath? Any known trauma, chew related incidents or access to bones and sticks?
A short phone video is enormously helpful. Grinding is difficult to describe accurately, several different jaw movements sound similar in words, and a recording removes that ambiguity in seconds.
Expect the examination to include a careful look in the mouth, palpation of the jaw and the muscles around it, and an abdominal examination. Depending on findings, your veterinarian may recommend dental radiographs under anaesthesia, blood work, imaging of the abdomen, or a trial of treatment for nausea. Do not attempt to open a painful dog's mouth widely at home or to remove anything you can see.
Home care after the cause is dealt with
Once your veterinarian has identified and addressed the cause, daily oral care becomes part of keeping the problem from recurring. Ask when to start, particularly after extractions or oral surgery, and ask what texture is suitable for a dog whose mouth has recently been sore.
Softer options are often the right starting point. Ark Naturals Soft Brushless Toothpaste is the soft format in Ark's brushless dental range, which the brand describes as a gentler chew suited to sensitive chewers that helps reduce tartar build up while using the same functional approach as the firmer version. It is available in Small and Large.
The boundaries matter here as much as anywhere. A dental chew is daily plaque control. It does not diagnose or treat a painful tooth, it does not address nausea, and periodontal disease remains a veterinary diagnosis requiring anaesthesia and radiographs. Ark makes no Veterinary Oral Health Council claim for this chew. If your dog is grinding now, the chew is a conversation for after the examination, not instead of it.
Call your veterinarian if
Book an appointment for any new grinding, and do not wait to see whether it settles. Call urgently if grinding began suddenly and your dog is distressed, if they are gagging or pawing at the mouth, if there is bleeding or facial swelling, if they have stopped eating, if there is repeated vomiting, or if you see disorientation, circling, unsteadiness or any seizure activity.
Ask specifically about pain relief, because a grinding dog is very likely uncomfortable and should not wait for a diagnostic pathway to conclude before getting help. Never give human painkillers, several of which are toxic to dogs, and do not use human dental products in a dog's mouth. If your dog takes other medication or has an existing condition, mention it, since that affects both the likely causes and the safe options.
Frequently asked questions
Is teeth grinding in dogs a sign of pain?
In most cases yes. Bruxism in dogs is strongly associated with discomfort, most often originating in the mouth or the digestive tract, and it is not considered a normal behaviour at any age. Because dogs conceal pain well, grinding may be one of the few outward signs available, which is why it warrants an examination rather than observation.
Why does my dog grind their teeth only at night?
Usually because the house is quiet enough for you to hear it, not because the cause is nocturnal. Some gastrointestinal discomfort does worsen overnight when the stomach has been empty for many hours, so mention the timing to your veterinarian, but assume the grinding is happening during the day as well and simply going unnoticed.
Can stress cause a dog to grind their teeth?
Anxiety can contribute in some dogs, and it is a recognised factor. It should not be the first conclusion, because pain is the more common driver and pain also generates anxious behaviour, which makes the two easy to confuse. A veterinary examination to exclude physical causes should come before any behavioural interpretation.
Will grinding damage my dog's teeth?
Sustained grinding can wear down the biting surfaces over time, and in some cases that wear reaches the dentine beneath the enamel, which creates sensitivity and a route for bacteria. That is an additional reason to address the underlying cause promptly rather than allowing the behaviour to continue for months.
What should I do if my dog starts grinding suddenly?
Check whether they are distressed, gagging, drooling heavily or pawing at their mouth, and contact a veterinarian the same day if any of those apply, since something lodged in the mouth is an urgent problem. If your dog seems comfortable, book an appointment promptly, record a short video, and note any other changes in eating, chewing or digestion to bring with you.
Related reading: Feline Tooth Resorption: Why Cats Lose Teeth From the Inside Out