The most obvious sign of a dislocated jaw in a dog is an inability to close the mouth, often combined with excessive drooling and a visible shift of the lower jaw to one side. If your dog’s mouth is suddenly hanging open, their teeth don’t line up the way they normally do, and they can’t eat or drink, a jaw dislocation (also called TMJ luxation) is a strong possibility. This is a veterinary emergency, and getting your dog seen quickly makes a significant difference in how easily the joint can be repositioned.
Key Signs to Look For
A dislocated jaw affects one or both sides of the temporomandibular joint, the hinge that connects the lower jaw to the skull. In most cases, the dislocation happens on one side, and the signs are distinctive enough for an owner to spot.
The hallmark sign is that your dog cannot fully close their mouth. The jaw may hang open or sit at an odd angle. Because the mouth stays open, saliva pools and drools continuously, since swallowing becomes difficult. Most dogs with this injury stop eating immediately, which is often what first prompts owners to seek help.
With a one-sided dislocation, the lower jaw typically shifts away from the affected side. So if the right joint is dislocated, you’ll notice the chin and lower teeth drifting to the left. The upper and lower teeth won’t meet normally. You may also see your dog react with pain when the mouth is touched or when they try to open it wider. Some dogs paw at their face or hold their head at a tilt.
What Else Could Cause These Symptoms
Several other injuries look very similar to a dislocation, and telling them apart at home is difficult. A fractured jaw, whether the upper or lower, can produce the same open-mouth posture, drooling, and misalignment. A tooth knocked loose from trauma can also prevent normal jaw closure. Tumors in the mouth or jaw area occasionally cause similar signs, though these develop more gradually rather than appearing suddenly. There’s also a condition called open-mouth jaw locking, where the jaw gets stuck open without the joint actually being displaced.
The sudden onset matters. A true dislocation almost always follows some kind of trauma or forceful event: being hit by a car, a fall, a collision during play, or biting down on something with unusual force. If the symptoms appeared suddenly after an injury, dislocation is high on the list. If the changes crept in over days or weeks, something else is more likely.
Breeds at Higher Risk
Any dog can dislocate their jaw from trauma, but certain breeds are more prone to TMJ problems because of how their joint is shaped. Irish Setters and Basset Hounds are the most commonly cited breeds with TMJ dysplasia, a condition where the joint develops abnormally and becomes less stable. Other breeds with documented TMJ issues include American Cocker Spaniels, Cavalier King Charles Spaniels, Boxers, Dalmatians, Golden Retrievers, and Labrador Retrievers. Dogs with joint dysplasia may dislocate their jaw from less forceful events than it would take in other breeds.
What to Do Before the Vet
Do not attempt to push the jaw back into place yourself. The anatomy around the jaw joint involves major nerves, blood vessels, and muscles, and forcing the joint without proper technique and sedation can cause serious additional damage. Even veterinarians perform this procedure under anesthesia.
Keep your dog as calm as possible. A dog with a dislocated jaw is in pain and may bite reflexively, even if they’ve never shown aggression before. Avoid putting your fingers in or near their mouth. Don’t try to feed them or give them water, since they can’t swallow properly and may choke. If there’s visible bleeding from the mouth, you can gently blot it with a clean cloth, but don’t probe inside. Transport your dog to a veterinarian or emergency animal hospital as soon as you can.
How Veterinarians Diagnose a Dislocation
Your vet will start with a physical exam, checking how the jaw moves, where the teeth meet, and how your dog responds to gentle manipulation. But imaging is essential to confirm the diagnosis and rule out fractures. Standard X-rays can reveal a dislocation, though CT scans provide a much more detailed picture. A CT scan captures thin cross-sectional images of the skull, sometimes as fine as 1 millimeter thick, allowing the vet to see exactly how the joint is positioned and whether any bone is damaged.
CT imaging is particularly important because the TMJ is a small, complex joint surrounded by critical structures. Subtle fractures or joint abnormalities that X-rays miss often show up clearly on a CT scan. Your dog will need to be anesthetized for the scan, since even slight head movement can distort the images.
How the Dislocation Is Treated
The first approach is called closed reduction, essentially guiding the joint back into place without surgery. With your dog under anesthesia, the vet places a small cylindrical object (like a pencil or wooden dowel) between the upper and lower back teeth to act as a lever. Then they gently close the jaw while using the dowel to nudge the lower jaw bone forward, releasing it from where it’s stuck, and then guiding it back into its normal position in the joint socket.
When this works cleanly, the jaw clicks back into place and no further intervention is needed beyond rest and pain management. If the joint feels unstable or drifts back out of position during the procedure, your vet will stabilize it. This might involve a tape muzzle that limits how wide the mouth can open, or a bonding technique that temporarily connects the upper and lower teeth to restrict movement while the joint heals.
Timing matters significantly. The sooner a dislocation is treated, the easier it is to fix. When a jaw stays dislocated for days or longer, scar tissue fills in around the joint, making closed reduction much harder or even impossible. In chronic cases or when manual repositioning fails, surgery becomes necessary. This can involve opening the joint directly to reposition it, or removing part of the jaw’s condyle (the rounded end that fits into the socket) to restore functional movement. These surgeries are complex and typically performed by a veterinary dental or surgical specialist.
Recovery and Home Care
Recovery time depends on the severity of the injury and whether surgery was involved. Most dogs recover fully within 3 to 12 weeks. During that period, diet is the biggest adjustment. Your dog will need to eat only soft food: canned food, kibble soaked in warm water until mushy, or veterinary-prescribed recovery diets. No hard treats, rawhides, dehydrated chews, or bones. No tug-of-war toys or anything that encourages forceful jaw movement.
If your dog has a tape muzzle or dental bonding to stabilize the joint, check it daily for loosening, rubbing, or sores on the skin. Your vet will schedule follow-up visits to monitor healing and eventually remove any fixation devices. Most dogs return to normal eating and activity once the joint has fully healed, though dogs with underlying TMJ dysplasia may have a higher risk of re-dislocation and could need long-term activity modifications.