Jaw abscesses

Jaw abscesses are unfortunately a common condition in rabbits. Treatment is quite complex, but when carried out correctly by a rabbit-savvy veterinarian experienced in dentistry, the abscess can often be successfully treated.

Symptoms

Usually, only one or two of the listed symptoms appear.

• Abscesses in the lower jaw are often easy to feel or see (swelling/thickening).

• Abscesses in the upper jaw often present with purulent nasal discharge or normal eye discharge (due to the abscess breaking into the nasal cavity) or ear infections (which often go unnoticed). In some cases, the eye may bulge slightly, leading to facial asymmetry. Mild breathing problems can also occur if the nose becomes clogged with pus.

• Some rabbits selectively eat soft food, eat less than before, or stop eating entirely.
  In many cases, the veterinarian may have noticed uneven tooth wear, as the rabbit chewed primarily on one side to avoid pain on the affected side.
  Some rabbits may drool (resulting in a wet chin).

 

Causes

The most common cause of jaw abscesses in rabbits is an infection of the tooth roots. This can be triggered by:

• Dental disease: This can occur when a veterinarian trims the teeth with pliers, causing microfractures that may lead to infected tooth roots. When dental treatment is necessary, the teeth should be filed or shortened using rotary instruments and never clipped with pliers.

• Chewing on foreign objects, such as small stones contained in pellets.

• Genetic dental misalignment, for example as a result of poor breeding practices.

• Inappropriate diet: For example, feeding pellets can contribute to retrograde tooth growth. Loose teeth can also be involved.

Jaw abscess caused by clipping the teeth

Another possible cause is an infection of the subcutaneous tissue, which is often triggered by:

• Injuries caused by sharp tooth edges, resulting from dental disease and insufficient tooth wear.
• Sharp objects.
• Bite wounds, for example from dominance fights.
• Foreign objects in the food.

Rabbits with dental disease may get thorns or other food particles stuck between their teeth that would be harmless to healthy rabbits.

Many aerobic and anaerobic bacteria can potentially cause abscesses. Various pathogens have been identified, including Pasteurella, Staphylococcus, Pseudomonas, Pasteurella multocida, and Escherichia coli.

Infections caused by dental disease or foreign objects can lead to the formation of pus. Because rabbits absorb the liquid from the pus, it becomes thick, sticky, and white and does not drain easily when the abscess is opened. This is one reason why abscesses in rabbits are particularly persistent.

Many abscesses grow very slowly and may initially go unnoticed because they are not necessarily painful in the early stages. However, the pus gradually spreads, and because jaw abscesses are located in the head, they can eventually reach areas that are critical for vital functions.

This can lead to ear infections, nerve involvement, respiratory problems, or even infection of the jawbone.

Schematic illustration of the nasolacrimal duct. It explains why dental diseases, such as retrograde tooth growth, can affect the tear duct, which runs directly alongside the open-rooted teeth at two points.

Diagnosis

In addition to jaw abscesses, tumors or bone cysts can also be possible causes of facial swelling.

Depending on the location of the abscess, diagnosis may include:

• Careful palpation of the head and the abscess, including whether the swelling can be clearly defined.
• Examination of the oral cavity, looking for discolored or loose teeth, or pus draining after pressure is applied to the abscess.
• Needle aspiration to determine whether the swelling contains pus.
• Skull X-rays in several projections, especially well-positioned lateral and dorsoventral views.
• Computed tomography (CT) or magnetic resonance imaging (MRI) to assess the extent of the abscess, the chances of successful treatment, the most appropriate treatment method, and the underlying cause, for example whether dental disease is involved and which teeth may need to be removed.

CT scan: abscess cavity in the upper jaw, originating from the first cheek tooth, which was removed.

If your rabbit has purulent or one-sided nasal discharge, or a swelling in the jaw area, your veterinarian should independently recommend X-rays from at least two different positions — at least 2 views, ideally 4 — or other diagnostic imaging such as MRI or CT.

If this is not the case, you should definitely consult a rabbit-savvy veterinarian experienced in dentistry.

Only in this way can the subsequent treatment be carried out successfully. Diagnostic imaging allows the veterinarian to determine, for example, which teeth are causing the problem, how far the abscess has spread, whether it has already led to an infection of the middle and inner ear, and how severely the jawbone is affected.

Without diagnostic imaging, no veterinarian can reliably provide this information.

Unfortunately, there are still veterinarians who treat jaw abscesses without taking X-rays or otherwise assessing the exact extent, underlying cause, and possible secondary complications. This can lead to cases in which rabbits undergo months of costly treatment, while the abscess continues to return.

These rabbits may eventually have to be euthanized after a prolonged period of suffering. In many cases, this could have been avoided through appropriate diagnostic imaging and expert treatment from the beginning.

Treatment

Prognosis

The chances of successful treatment depend on several factors in each individual case:

• How rabbit-savvy, experienced, and specialized in dentistry is the veterinarian?
• Where exactly is the abscess located? Some areas are more difficult to access than others. In the lower jaw, the abscess cavity is more likely to become contaminated with food than in the upper jaw.
• What condition are the rabbit’s remaining teeth in? Does the rabbit have generally good teeth or severe dental misalignment? Is the unaffected side of the jaw intact so that the rabbit can chew there after surgery? However, even if no intact chewing surface remains, most rabbits can still live with this without major problems (see below).
• How many teeth are affected by the abscess?
• Is the bone already affected or destroyed, and if so, where and to what extent?
• Surgical technique: Was all infected tissue removed and was the underlying cause addressed, for example by extracting the affected teeth?
• Is the owner willing to proceed with the necessary diagnostics, treatments, and, if required, repeated surgeries?
• The rabbit’s temperament: Does it start eating again quickly, and can the necessary medications be administered?
• Postoperative care: Is the rabbit intensively cared for, syringe-fed if necessary, given its medications, and offered attractive foods so that it starts eating again quickly? Is the owner prepared to administer antibiotics by injection?

Access to the abscess cavity is usually possible through the mouth, although in some cases it must be opened externally.

Treatment option	When it may be used	Important points
Conservative treatment	Individual cases, especially when the rabbit eats well and no clear dental cause is found	Antibiotics and pain medication; abscess may continue to spread; close X-ray monitoring is essential
Surgical treatment	Most cases in which the cause can be treated surgically	Abscess opened, pus removed, affected teeth/foreign bodies removed, infected tissue and ideally the abscess capsule removed

Which Antibiotics?

Choosing the right antibiotic is crucial when treating jaw abscesses. Only the active ingredients enrofloxacin and the sulfonamides sulfadimethoxine (Relardon®) and sulfaquinoxaline are licensed for use in rabbits. For this reason, other antibiotics must be used off-label for treatment.

Studies in rabbits with jaw abscesses show that the bacterial flora can vary considerably and may include both aerobic and anaerobic bacteria. It is therefore advisable to carry out a bacteriological examination with an antibiogram.

The sample for the antibiogram should not be taken from the pus, as this usually contains only bacteria that are no longer capable of multiplying. Instead, the sample should be taken from the peripheral areas of the abscess that bleed during curettage.

Anaerobic bacteria are often not detectable, even when they are present, but antibiotic treatment should always cover them as well.

Preparing the antibiogram usually takes about one week. During this time, the rabbit must already receive antibiotic treatment.

Suitable options for this period include:

• For this period, suitable antibiotics include:

• Chloramphenicol,
• Tetracyclines, or
• A combination of fluoroquinolones and metronidazole.

Suitable antibiotics for the treatment of jaw abscesses:

Based on the antibiogram, but always cover anaerobes as well!

Fluoroquinolones (Enrofloxacin, Marbofloxacin, Ciprofloxacin), e.g., Baytril (10 mg/kg twice daily), Marbofloxacin, e.g., Marbocyl (10 mg/kg once daily), always in combination with Chloramphenicol, Amoxicillin, Tetracycline, Pradofloxacin, or Metronidazole.

 

Chloramphenicol (20–40 mg/kg twice daily) shows very good effectiveness against anaerobes and often has an effect against aerobes as well. It is well-tolerated, even when administered orally.

 

Tetracyclines are very effective against anaerobes and have average effectiveness against aerobes. They are also well-tolerated.

Penicillins (never orally, only injected): e.g., Amoxicillin, Streptomycin (usually Duphamox, 10–20 mg/kg once daily or Veracin RS 0.1 ml/kg once daily). Amoxicillin is very effective against anaerobes and average against aerobes. Amoxicillin can lead to fatalities and digestive issues, so it should only be used after strict indication and when the digestive system is functioning well.

Metronidazole (25 mg/kg twice daily or 40 mg/kg twice daily orally) is effective against anaerobes (except Actinomycetes) and is very well-tolerated. If there is also an infection with aerobes, it can be combined with fluoroquinolones.

Trimethoprim/Sulfadiazine, e.g., Cotrim K (40 mg/kg twice daily), has good effectiveness against both aerobes and anaerobes.

Sulfonamides are unsuitable as they work well against aerobes and are well-tolerated but do not work against anaerobes. As a bacteriostatic antibiotic, they cannot be combined with other active ingredients!

Gentamicin is recommended only for local use (e.g., in the mouth) if it is sensitive in the antibiogram, as systemic administration can harm the kidneys.

Supportive Treatments and Care

• When treating jaw abscesses, it is essential to provide a very wide variety of food around the clock. This should include different types of palatable leafy greens, such as endive, carrot tops, kohlrabi leaves, clover, and dandelion, as well as foods that require very little chewing, such as soaked Cuni Complete from a pet store.

• Medications must be administered absolutely reliably. The owner should be willing to learn how to give medications by injection, as this makes it possible to use highly effective penicillins when necessary. The rabbit needs high-dose pain medication — note that pain medications are dosed higher in rabbits than in dogs and cats — and usually a combination of several pain medications so that it starts eating again. Medications should be administered as gently as possible.

• Make sure that all necessary surgeries are carried out, consult a specialized veterinarian, and have the abscess thoroughly diagnosed using skull X-rays from four different views, CT, or MRI.

• Postoperative care: Provide a quiet environment and intensive care, including supplementary feeding with soft food and adequate administration of pain medication and antibiotics. A wide variety of food should be offered, including favorite foods, tempting leafy greens such as carrot tops, dandelion, kohlrabi leaves, clover, alfalfa, and grass, as well as soaked dry food, for example Cuni Complete.

• Mucolytics, such as acetylcysteine (ACC) and bromhexine, can help make the pus somewhat more fluid. Antibiotics also often work better when these are used.

• The rabbit can also be supported with anti-inflammatory foods, such as radish, horseradish, nasturtium, ginger, and cress. Because these foods are often poorly accepted, they can be mixed with the rabbit’s favorite foods.

• If the abscess is not thoroughly diagnosed and surgically treated, it can continue to spread within the head. Rabbits often do not show the pain they are experiencing, so the owner may not realize that the condition is getting worse. If the abscess is treated only with antibiotics and without surgery, the success of the treatment must be monitored closely using X-rays to ensure that the rabbit does not suffer.

• Depending on the condition, some teeth may need to be removed. Depending on which teeth are extracted, the diet must then be adapted to the rabbit’s dental situation, for example with soaked dry food, grated vegetables, or food cut into small pieces.

Case Reports

Moritz, a satin rabbit with many jaw abscesses and dental problems

His entire lower right row of teeth and one lower incisor were removed. Through surgeries and long-term antibiotics (Amoxicillin), it was possible to get it under control, allowing him to live for several more years without abscesses.

Mia

Mia had severe abscesses in two quadrants and generally very bad teeth. In several surgeries, all of her molars were removed (first the abscesses on the upper right and lower left, then gradually depending on the severity). She still has all of her incisors. One of the front teeth was also affected at the root by the inflamed molars, but it grew back healthily after the diseased molars were removed. She now eats Cuni Complete from the feeder (two handfuls daily) and vegetables (cucumber, cabbage, bell peppers, etc.—soft foods that she can bite into, no more grass), and you wouldn’t notice that she no longer has molars. Even though the thought of a rabbit without teeth initially seemed strange to me, I would say I would do it again. She became ill at 3 years old and is now 10 years old, and after her dental treatment was completed, she no longer had to visit the vet for her teeth and is completely healthy!

Upper jaw abscess with surgery, drainage, and intensive aftercare and nursing over 3 weeks.

Note: For rabbits, a cone should be replaced with a soft fabric version, or, in many cases, it is unnecessary and can be omitted entirely.

Bruno

Bruno had nasal discharge (purulent) and was initially misdiagnosed and mistreated for rabbit snuffles. A CT scan revealed a severe upper jaw abscess, and his entire upper row of teeth was removed in two surgeries. As a result, the opposing teeth in the lower jaw were no longer worn down naturally and initially had to be trimmed every three months, later only annually (they grow more slowly without counterpressure or stop growing altogether). Unfortunately, due to a treatment error, complications arose, resulting in an oronasal fistula (a connection between the nose and mouth), causing food to occasionally get into his nose and be sneezed out. Despite this, he lived a happy and active life until the age of 10 and ultimately passed away from a tumor in his intestine.

Minnie with Jaw Abscess

A rabbit with very severe dental issues (“end-stage teeth”). Minnie was already receiving monthly dental treatments when the swollen cheek caused by a tooth abscess appeared, which was then surgically treated. As bad as such photos may look, things do get better, and Minnie is doing great today.

Sepperl

Frequently Asked Questions About Jaw Abscesses in Rabbits

What are the signs of a jaw abscess in rabbits?
Possible signs include swelling or thickening of the jaw, purulent or one-sided nasal discharge, eye discharge, ear infections, facial asymmetry, mild breathing difficulties, drooling, reduced food intake, preference for softer foods, and uneven tooth wear. Often, only one or two symptoms are present.

What causes jaw abscesses in rabbits?
The most common cause is an infection of the tooth roots. Possible triggers include dental disease, clipping teeth with pliers, foreign objects, genetic dental misalignment, inappropriate diet, retrograde tooth growth, injuries caused by sharp tooth edges, bite wounds, and foreign objects in food.

How is a jaw abscess diagnosed in rabbits?
Diagnosis may include careful palpation of the head and abscess, examination of the mouth, needle aspiration, skull X-rays from several views, CT, or MRI. Diagnostic imaging is especially important for determining the extent of the abscess, the teeth involved, possible bone damage, and whether the infection has spread to areas such as the middle or inner ear.

Why are X-rays, CT, or MRI so important for jaw abscesses?
Much of a rabbit’s teeth is located inside the jaw and cannot be assessed simply by looking into the mouth. Imaging can show which teeth are causing the problem, how far the abscess has spread, how much of the jawbone is affected, and whether secondary complications are present.

Can a jaw abscess in a rabbit be treated without surgery?
Conservative treatment with antibiotics and pain medication may be considered in individual cases, for example when the rabbit is eating very well and no clear dental cause can be identified. However, the pus often continues to spread, and only rarely does the abscess shrink and become encapsulated. If surgery is not performed, treatment success must be monitored closely with imaging.

What affects the prognosis of a rabbit with a jaw abscess?
The prognosis depends on factors such as the location and extent of the abscess, the condition of the remaining teeth, the number of teeth involved, whether bone is affected, the surgical technique, the veterinarian’s dental and surgical experience, postoperative care, and how well the rabbit eats and tolerates medication.

What should a rabbit eat after jaw abscess surgery?
A wide variety of food should be available around the clock. Immediately after surgery, soft foods may be easier and less painful to eat, including soft mash, soaked dry food, favorite foods, and tempting leafy greens such as carrot tops, dandelion, kohlrabi leaves, clover, alfalfa, and grass. If teeth have been removed, the food should be adapted to the rabbit’s dental situation.

About This Article

Original content by Viola Schillinger, veterinarian
Veterinarian specializing in rabbit health, nutrition and species-appropriate husbandry, and founder of Kaninchenwiese.de, a long-established German rabbit care and health resource reaching around 500,000 visitors per month.

English translation and adaptation by Erika Kühne Escobar

Medically reviewed by Viola Schillinger, veterinarian
Last medically reviewed: August 2026

 

Sources/Further Reading:

Ewringmann, A. (2016): Leitsymptome beim Kaninchen: diagnostischer Leitfaden und Therapie. Georg Thieme Verlag.
Ewringmann, A. (2017). Keimspektrum und Antibiotikasensitivitäten bei eitrigen Zahnerkrankungen von Kaninchen. Tierärztliche Praxis Kleintiere/Heimtiere, 45(06), 373-383.
Gabriel, S. (2016): Molarenextraktion bei Heimtieren–Indikation und Technik. kleintier konkret, 19(S 02), 18-22.
Gabriel S. (2016): Praxisbuch Zahnmedizin beim Heimtier. Stuttgart: Enke
Glöckner, B. (2002): Untersuchungen zur Ätiologie und Behandlung von Zahn-und Kiefererkrankungen beim Heimtierkaninchen (Doctoral dissertation, Freie Universität Berlin, Universitätsbibliothek).
Göbel, T., & Macha, M. (2008): Dosierungstabellen für Nagetiere und Kaninchen. kleintier konkret, 11(03), 22-27.
Harcout-Brown, F. (2009). Dental disease in pet rabbits 3. Jaw abscesses. In practice, 31(10), 496-505.
Hartmann, M. (2007): Zahnextraktion hypsodonter Zähne bei Nagern und Hasenartigen. veterinär spiegel, 17(01), 22-27.
Kraft, W., Emmerich, I. U., & Hein, J. (2012): Dosierungsvorschläge für Arzneimittel bei Kleinnagern, Kaninchen und Frettchen. Schattauer Verlag.
Medirabbit: Sichere Antibiotika für Kaninchen. [http://www.medirabbit.com/GE/Safe_medication/Antibiotics/sichere_antibio_ge.htm, 8.12.17]