Underbite (Mandibular Prognathism) in Dogs
When to visit the vet?
Home care monitor at home and contact your vet if worse
YELLOW for problems with gripping/chewing, injuries to the palate/lips, or malocclusion with inflammation. ORANGE for massive food intake disruption or jaw pain.
Unsure about what’s wrong with your pet? Feel free to use our Symptom Checker for more clarity
Definition
An underbite in dogs, also known as mandibular prognathism, is a malocclusion syndrome where the lower jaw is longer than the upper jaw. This causes the lower incisors to protrude in front of the upper incisors.
Can Occur with the Following Diseases:
Basics and possible causes
An underbite in dogs can have genetic causes and often occurs in certain breeds that have developed such a jaw position as a standard trait due to breeding. These breeds include Boxers, Bulldogs, and Shih Tzus, among others. In these breeds, an underbite is often considered typical for the breed and is not seen as a defect.
Aside from genetic factors, other causes can lead to an underbite. Growth anomalies during jaw development, traumas or injuries during the growth phase, and unexpected growth disorders can contribute to the lower jaw becoming longer than the upper jaw.
In some cases, an underbite can also be exacerbated by external factors such as improper feeding or malnutrition during a puppy’s developmental years. These factors can impair the normal growth and development of the jawbones.
Typical accompanying symptoms
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Abnormal tooth position: The most noticeable sign is the lower incisors overlapping the upper ones. This can lead to difficulties with biting and chewing.
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Mucosal injuries: The longer lower jaw can cause the lower teeth to injure the gums or the palate, leading to pain and potential infections.
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Excessive salivation: Dogs with a strong underbite may salivate excessively because the teeth and gums do not close properly, leading to uncontrolled drooling.
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Difficulty eating: Dogs with an underbite may have difficulty chewing, which can cause them to refuse food or be slower when eating.
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Changes in behavior: Due to pain or discomfort when eating or chewing, affected dogs may be irritable or less playful.
When to visit the vet?
A veterinarian should be consulted if the underbite causes problems with eating or if the dog shows signs of pain, such as restlessness, frequent licking, or scratching around the mouth area. A vet visit is also strongly advised if injuries to the oral mucosa or bleeding gums are observed.
Another sign that a vet should be consulted is a sudden change in behavior indicating pain or discomfort. This can manifest as aggression, withdrawal, or reduced food intake.
Symptom recognition for animal owners and veterinary diagnostic procedures
Pet owners can identify an underbite through simple observation. If the lower jaw is visibly longer than the upper jaw and the lower incisors protrude beyond the upper ones, an underbite is likely present.
The veterinarian will perform a thorough examination of the mouth and teeth. This includes a visual inspection and palpation of the jaw to determine the extent of the misalignment. In some cases, the vet may order X-rays to assess the structure of the jawbones and rule out potential underlying causes such as fractures or growth anomalies.
The diagnostic process may also include assessing the dog’s general health to ensure that there are no other health problems that could affect jaw development.
What can pet owners do and professional therapy options
Pet owners can take steps to alleviate the symptoms of an underbite and avoid potential complications. One way is to ensure proper nutrition to support jaw development and minimize the risk of growth anomalies. Feeding soft or easily chewable food can help make eating easier and avoid unnecessary pressure on the teeth and gums.
Regular oral hygiene is also important to prevent dental problems. This includes brushing teeth with a toothpaste suitable for dogs to reduce plaque and tartar (calculus). Pet owners should also regularly check the dog’s mouth for signs of injury or inflammatory conditions.
If the underbite causes significant problems, the vet may suggest specific corrective measures, such as orthodontic procedures or surgical corrections. However, these options should be carefully weighed based on the extent of the misalignment and the dog’s overall health.
Outlook on current research
There are some interesting developments in the field of veterinary research regarding underbites in dogs. A recent study investigated genetic predispositions for jaw anomalies in various dog breeds. It was found that certain breeds, such as the Boxer or the Bulldog, have a higher genetic predisposition for an underbite. These findings help veterinarians better account for a dog’s genetic history when diagnosing jaw problems.
Another branch of research examines the effects of an underbite on the overall health and well-being of dogs. This involves studying how jaw misalignments can affect eating behavior, dental health, and even social interaction with other dogs. Initial results suggest that dogs with a pronounced underbite suffer more frequently from dental problems and have difficulty eating hard food.
Regarding therapeutic approaches, research is increasingly focusing on non-invasive methods. New orthodontic devices specifically developed for dogs offer the possibility of correcting jaw misalignments without surgical intervention. These devices are particularly suitable for young dogs whose jaws are still developing. Initial clinical studies show promising results in terms of improving jaw closure and reducing tooth wear.
Additionally, the role of nutrition in the prevention and management of underbites is being investigated. Researchers are developing special diets aimed at strengthening the jaw muscles and reducing the risk of malocclusion. These diets often contain a balanced mix of proteins, vitamins, and minerals that support the growth and development of the jaw.
In the long term, the goal of the research is to identify genetic markers that make it possible to recognize the risk of an underbite as early as puppyhood. This could help breeders plan targeted matings to reduce the occurrence of this misalignment. Such markers could also enable more precise diagnosis and individualized treatment plans for dogs already showing symptoms of an underbite.