Overgrown Teeth in Rabbits: Spotting Dental Disease Before Your Rabbit Stops Eating

Rabbits are experts at hiding pain, and dental disease is the condition where that instinct does the most damage. Overgrown teeth in rabbits build up slowly, over months, and by the time a rabbit refuses food the problem is usually well advanced. This guide is for anyone who lives with a rabbit and wants to catch trouble at the stage where it is still a small change in eating habits, not a crisis. You will find what the earliest signs look like, how to run a simple check at home, and the point at which a rabbit needs to be seen the same day.

Why do rabbits get overgrown teeth in the first place?

Every tooth in a rabbit's mouth grows continuously through life, front teeth and back teeth alike. The Merck Veterinary Manual explains that chewing is what keeps them in check: teeth grind against teeth, and the wear balances the growth. Take the wear away and the growth simply carries on.

That growth is not trivial. In a feeding study measuring the effect of diet abrasiveness, cheek teeth grew at roughly 1.4 to 3.2 mm per week, with growth closely tracking how much wear the diet produced. A few weeks of the wrong food is enough to shift the balance.

The main drivers are:

• Not enough hay: grinding coarse grass hay takes wide, sideways jaw movements that wear the back teeth evenly. Pelleted food and grain are crushed with a more up-and-down motion, which wears the crowns far less. A teaching review presented at a WSAVA congress sets out this difference in chewing pattern clearly.
• Jaw shape: short-faced and dwarf breeds are built with a mismatch between upper and lower jaw. Writing in Clinician's Brief, a veterinary dental specialist notes that a domed forehead combined with dwarfism predisposes rabbits to a skeletal misalignment, and recommends periodic professional mouth checks for dwarf breeds in particular.
• Age: in a review of 100 rabbits that had head CT scans, older rabbits had higher grades of dental disease and more advanced misalignment.
• Injury: a fractured tooth or a knock to the jaw can throw the whole arcade out of line. Young rabbits can also damage their incisors chewing cage wire.

It is common. In a study of 1,420 pet rabbits at a private practice, acquired dental disease was found in about a quarter of them, most often affecting the cheek teeth rather than the visible front teeth. The same study found that eating hay and having a freer, less confined lifestyle both lowered the risk.

What are the early signs of dental disease in rabbits?

Almost none of the early signs happen inside the mouth where you can see them. Watch for changes in behaviour and in the litter tray.

• Eating more slowly, or taking longer over a meal than usual
• Picking out soft foods and pellets and leaving the hay
• Dropping food from the mouth, or chewing on one side
• A damp chin, wet chest fur, or actual drooling
• Droppings getting smaller, drier, fewer, or disappearing altogether
• Gradual weight loss and a coat that starts to look unkempt because grooming hurts
• Runny eyes or a tear-stained face, since the tear duct runs right past the upper tooth roots
• Nasal discharge, a bulging eye, or a lump along the jaw or cheek
• Grinding the teeth loudly, sitting hunched, or becoming reluctant to be handled

Weight loss deserves its own mention. Rabbit clinicians writing in Veterinary Times point out that dental disease typically causes a slow, chronic decline in weight and body condition that goes unnoticed in even attentive households, so that many rabbits are only brought in once they are severely debilitated. A monthly weigh-in on kitchen scales is one of the most useful things you can do. A drop of more than a few percent in a rabbit that is not on a diet is worth a phone call.

The home check you can safely do

You can look at the front teeth yourself. Angell Animal Medical Center describes the technique: smooth the whiskers back, part the lips gently by drawing them sideways rather than upwards so you do not block the nostrils, and look at the teeth from the front and from the side. The two lower incisors should sit neatly in the notch behind the large upper pair. Teeth that splay outwards, curl, or no longer meet are abnormal.

What you cannot see at home is the back of the mouth, and that is where most of the disease lives. A rabbit's gape is narrow and the tongue is large. Even a vet using an otoscope on a conscious rabbit will miss lesions, which is why an earlier Clinician's Brief overview warns that a conscious mouth exam must never be used to rule dental disease out when the history points towards it.

The imaging evidence backs this up. When 15 pet rabbits with dental disease had detailed cone beam CT scans, pathology was repeatedly found that oral examination could not detect, including elongation of the tooth roots into the bone and early periodontal changes. In one rabbit the bite looked normal from the mouth while the scan showed severe root elongation and bone loss. So a clean-looking front end is reassuring but not proof.

Why waiting until your rabbit stops eating is dangerous

As the crowns overgrow, they develop sharp points. Because a rabbit's lower jaw is narrower than the upper, those points typically form on the tongue side of the lower teeth and the cheek side of the upper ones, cutting into soft tissue with every chew. Merck notes that these small cuts inside the mouth can become infected.

Two things then follow. First, chewing hay hurts, so the rabbit switches to whatever it can mash quickly, which removes the last of the tooth wear and speeds the whole process up. Second, fibre intake collapses, and a rabbit gut that stops receiving fibre stops moving.

That is the real emergency. A rabbit that has not eaten for a day or two can slide into gut stasis and, from there, into liver failure from fat mobilisation. Guidance on critical care in rabbits describes this sequence and puts the normal body temperature at 38.5 to 40°C, with hypothermia a common feature of a rabbit in shock. In a study of 117 rabbits presented with signs of gut dysfunction, those that were hypothermic on arrival were five times more likely to die or be euthanised than those with a normal temperature. A cold, quiet, non-eating rabbit is not a case for waiting until morning.

Pain and reduced grooming also leave a rabbit with a permanently damp chin or a soiled rear end, which in warm weather adds a separate and very fast-moving risk of flystrike.

When should you call the vet?

Book an appointment within the next day or two if you notice:

• Any change in how your rabbit eats, including sorting through food or chewing more slowly
• A wet chin, drooling, or a smell from the mouth
• Weight loss, a scruffy coat, or reduced grooming
• Tear overflow, a stained face, or nasal discharge

Treat these as same-day emergencies:

• No food eaten for around 12 hours, or no droppings appearing in the tray
• A rabbit sitting hunched, pressing its belly to the floor, or grinding its teeth hard
• A firm lump on the jaw, cheek or under the eye, or an eye that looks pushed forward
• Lethargy with cold ears and a cold body
• Complete refusal of even favourite soft foods

Do not attempt to trim or clip your rabbit's teeth yourself, and be wary of anyone offering to do it with nail clippers. Cutting instruments cannot restore the correct tooth shape and can fracture the part of the tooth buried in bone, which is one of the routes to a tooth root abscess.

What will the vet do?

A proper assessment means a full mouth examination under anaesthesia or deep sedation, combined with imaging, because so much of the disease sits inside the bone. Skull radiographs are the usual starting point; CT gives more detail and is often used when abscesses, eye or nose signs, or surgical planning are involved.

Treatment aims to bring the crowns back to a more normal length and shape using dental burrs rather than cutters, to remove teeth that are loose or diseased, and to control pain and infection. Rabbits that have been off food usually also need fluids, pain relief and syringe feeding with a fibre-based recovery diet until they are eating again.

Abscesses are harder work. A study of 72 rabbits with tooth root abscesses found that lop-eared breeds were the most commonly affected, that the lower jaw was involved in most cases, and that antibiotics on their own resolved only about a quarter of cases, compared with 85% when combined with surgical packing of the abscess. Antibiotics alone are not a solution.

Be prepared for this to be ongoing. Because the teeth keep growing, many rabbits need repeat procedures for life, and the interval between them varies from rabbit to rabbit. Your vet will set a recheck schedule based on how fast the crowns come back.

How do you prevent it?

• Make hay the bulk of the diet: unlimited good-quality grass hay, available all day, every day. This is the single most effective preventive measure and the one most owners under-do.
• Keep pellets to a small, measured portion: and treat fruit as an occasional extra rather than a daily item.
• Weigh your rabbit monthly: and keep a note. Trends matter more than single readings.
• Look at the front teeth every couple of weeks: and run your fingers along the underside of the lower jaw. Hard, bumpy swellings there can mean tooth roots are pushing into the bone, a change that often appears before the rabbit looks unwell.
• Book routine dental checks: particularly for dwarf, lop and short-faced rabbits, and for older rabbits, since disease grade climbs with age.
• Give space to move and forage: rabbits with more freedom had a lower risk of dental disease in the practice study above.

The takeaway

Dental disease in rabbits is common, progressive and largely silent in its early stages, and the mouth usually looks fine from the outside long after the trouble has started. The signs that give it away are behavioural: slower eating, a preference for soft food, a damp chin, fewer droppings, a slow slide in weight. Act on those and the treatment is straightforward. Wait until your rabbit stops eating and you are dealing with a gut that has shut down as well as a mouth that hurts. When in doubt, weigh your rabbit, count the droppings, and call your vet rather than watching for another day.