Malocclusion in Dogs

Malocclusion in dogs means the teeth, jaws, or both do not meet in a normal functional way when the mouth closes. In a typical canine bite, the upper incisors slightly overlap the lower incisors, the lower canine teeth fit into the spaces between the upper third incisors and upper canines, and the premolars interlock in a scissor-like pattern. A malocclusion can be skeletal, where jaw length or symmetry is abnormal, or dental, where the jaws are normal length but one or more teeth erupt in the wrong position.

Not every unusual-looking bite is a medical problem. Some flat-faced breeds naturally have a lower jaw that sits forward, and that can be considered normal for the breed. What matters most is function. If a tooth is striking the palate, lip, gum, or another tooth, the bite can become traumatic and painful. Over time, that may lead to soft tissue injury, abnormal tooth wear, fractures, periodontal disease, or even an oronasal fistula in severe cases.

Malocclusion is often first noticed in puppies as adult teeth erupt, especially between about 4 and 7 months of age. Retained baby teeth are a common contributor because they can crowd the permanent teeth and force them inward or outward. Some dogs also develop malocclusion after facial trauma or jaw fractures that heal in an abnormal position.

For pet parents, the key point is that treatment decisions are based on comfort and oral health, not appearance. A dog with a quirky underbite may never need intervention, while a dog with only one badly positioned canine tooth may need timely care. Your vet may recommend monitoring, dental imaging, extraction, or referral to a veterinary dental specialist depending on the type and severity of the problem.

Diagnosis starts with a careful oral exam and a discussion of your dog’s age, breed, chewing habits, and any signs of discomfort. Your vet will look at how the incisors, canines, premolars, and molars meet when the mouth closes. They will also check for soft tissue trauma, abnormal wear, retained baby teeth, fractured teeth, and signs of periodontal disease.

In puppies, timing matters. A bite that looks unusual during active tooth eruption may improve, stay the same, or become more traumatic as the jaws continue to grow. That is why repeated exams during the teething months are often recommended. If a retained deciduous tooth is present, your vet will assess whether it is crowding the permanent tooth or creating a painful interlock.

Many dogs need a more complete oral exam under anesthesia for full assessment. This allows your vet to evaluate the mouth without pain or movement and to obtain dental radiographs when needed. Dental x-rays help assess tooth roots, jaw bone, and any hidden damage below the gumline. They are especially useful before extractions, when trauma is suspected, or when treatment planning includes crown reduction or orthodontic movement.

Your vet may also recommend referral to a veterinary dentist when the case is complex, when large teeth such as canines are involved, or when there is concern for palate trauma, tooth vitality, or jaw asymmetry. The goal of diagnosis is not to label the bite cosmetically. It is to determine whether the malocclusion is functional, painful, and likely to harm long-term oral health.

Malocclusion can be congenital, developmental, or acquired. Congenital and developmental cases are often related to inherited jaw shape or tooth position. Skeletal malocclusions happen when the upper and lower jaws are different lengths or grow asymmetrically. Dental malocclusions happen when the jaws are a reasonable match, but one or more teeth erupt in the wrong place.

Breed plays a role. Brachycephalic dogs such as Boxers, Boston Terriers, Shih Tzus, and Lhasa Apsos commonly have a forward lower jaw that may be considered normal for the breed. Even so, a breed-related bite can still become medically important if teeth are traumatizing soft tissue. Some dogs also develop rostral or caudal crossbites, base-narrow lower canines, or mesioverted upper canines.

Retained baby teeth are one of the most important risk factors in puppies. When a deciduous tooth stays in place after the permanent tooth starts erupting, the adult tooth can be displaced into an abnormal position. This is especially common with canine teeth and can lead to painful contact with the palate. Early extraction of retained baby teeth may allow the permanent tooth to move into a more normal position.

Acquired malocclusion can happen after facial trauma, bite wounds, or jaw fractures that heal out of alignment. Less commonly, severe crowding and plaque-retentive surfaces can worsen periodontal disease around malpositioned teeth. In many cases, more than one factor is involved, so your vet will look at age, breed, eruption pattern, and any history of trauma before discussing options.

Not all malocclusions can be prevented, especially when jaw shape is inherited. Still, early monitoring can make a real difference. Puppies should have their mouths checked regularly as adult teeth erupt, and pet parents can look weekly for double rows of teeth, inward-pointing canines, crowding, or sores on the palate and gums.

One of the most practical prevention steps is addressing retained baby teeth promptly. If a deciduous tooth remains after the permanent tooth starts coming in, it can push the adult tooth into an abnormal and painful position. Your vet may recommend early extraction rather than waiting for a routine spay or neuter date.

Good oral care also matters. Regular tooth brushing, routine dental exams, and professional cleanings when your vet recommends them can help reduce plaque and periodontal disease around crowded or malpositioned teeth. Home care will not change jaw alignment, but it can help protect the teeth and gums that are already at higher risk.

Preventing facial trauma is also worthwhile. Use appropriately sized chew items, avoid very hard objects that may fracture teeth, and seek prompt care after any jaw injury or bite wound. If your dog has had facial trauma, a follow-up oral exam is important because acquired malocclusion may not be obvious right away.

The outlook for dogs with malocclusion is usually good when painful contact is identified and managed early. Many dogs do very well after extraction of a problematic tooth or after specialty treatment that removes traumatic contact. Puppies often have the best chance of a smoother recovery because treatment can happen while the mouth is still developing.

Recovery depends on the procedure performed. After extractions or restorative dental work, most dogs go home the same day and need a period of soft food, activity restriction around chew toys, and recheck visits. If orthodontic appliances are used, recovery is less about rest and more about careful follow-up. Your vet or veterinary dentist will want to monitor movement, tissue health, and whether the bite is becoming more comfortable.

Long-term prognosis is best when the goal is realistic: a comfortable, functional mouth. That does not always mean a perfectly aligned bite. Some dogs will continue to have an unusual-looking jaw shape but live comfortably with no ongoing trauma. Others may need staged care if they have jaw asymmetry, severe crowding, or complications such as tooth wear or palate injury.

If malocclusion is left untreated when it is traumatic, prognosis becomes less favorable because chronic pain, tooth damage, periodontal disease, and soft tissue injury can worsen over time. Regular dental follow-up helps catch those changes early and gives your vet a chance to adjust the plan as your dog grows or ages.