Reasons Why Dogs Grind Their Teeth

In this guide

The grinding or clicking sound of a dog's teeth rubbing together, known medically as bruxism, is easy to miss the first time but worth paying attention to once noticed. Unlike some quirky dog habits, teeth grinding is very rarely just a harmless idiosyncrasy; it usually points to something that needs a vet's attention.

The most common underlying causes

Dental and oral pain is one of the leading drivers, and this includes misaligned or fractured teeth, gum disease, oral ulcers, or growths in the mouth, any of which can make a dog grind as an unconscious response to discomfort. Gastrointestinal pain or nausea is another frequent cause, and vets sometimes see grinding resolve once an underlying stomach issue, or even a heavy intestinal parasite burden, has been properly treated. Jaw misalignment, sometimes called malocclusion, can cause grinding even without active pain, though it still deserves a vet's assessment to prevent long-term wear. Anxiety and stress are recognised contributors too, though most veterinary sources consider genuine pain, dental or gastrointestinal, the more common explanation than anxiety alone.

Why it needs prompt attention, not just observation

Persistent grinding wears down tooth enamel over time, exposing the more sensitive layers underneath and increasing the risk of fractures and infections, while also placing ongoing strain on the jaw joint that can lead to arthritis and further pain, creating a cycle where the grinding itself becomes part of the problem. Because the underlying cause can range from a straightforward dental issue to a more significant gastrointestinal or neurological condition, a proper veterinary examination, sometimes including bloodwork, imaging, or a dental assessment under anaesthesia, is the right next step rather than waiting to see if it resolves on its own.

Puppies going through teething sometimes show mild, temporary grinding as new teeth come in, which is generally less concerning than grinding that appears suddenly in an adult dog. Either way, since bruxism is a symptom rather than a standalone quirk, it's always worth mentioning to a vet rather than dismissed as just a strange noise.

Spotting it in the first place

Teeth grinding is easy to miss since it often happens quietly during rest or sleep, and some owners only notice it when a family member happens to be in the room at the right moment. Keeping a rough note of when it's heard, during sleep, after meals, or seemingly at random, alongside any other changes such as reduced appetite or reluctance to chew hard food, gives a vet more to work with at the first consultation, rather than trying to reproduce or demonstrate the sound during a brief appointment.

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