Reading pain in a rabbit: the face, the posture, and what a prey animal hides

Quick answer

A comfortable rabbit under handling: eye fully open and round, cheeks full, nose relaxed, whiskers held out and loose. This is the baseline every pain sign is measured against.

A rabbit in serious pain will sit still, keep its eyes open, and eat a little if you offer something tempting. That is not reassurance. It is a prey animal doing the only thing evolution equipped it to do.

Pain in rabbits is read from the face, the posture and the behaviour, in that order of reliability, and the single most useful thing an owner can do is learn what their own rabbit's comfortable face looks like before they ever need to compare.

• Five facial features change with pain: the eye tightens, the cheeks flatten, the nostrils narrow, the whiskers stiffen forward, and the ears fold and rotate back.
• A loaf and a hunch look similar and mean opposite things. The difference is in the spine, the eye and the response to sound.
• Rabbits mask in front of people, so a video of the rabbit alone in the room tells you far more than watching it.
• Pain slows the gut, a slow gut causes gas, and gas causes more pain. In a rabbit this loop is what kills.
• Never give a rabbit a human painkiller. Ibuprofen, paracetamol and aspirin are not safe substitutes for what a vet will prescribe.

:::danger
A rabbit that is hunched, pressing its belly to the floor, grinding its teeth loudly and not moving is an emergency tonight, not tomorrow morning.

This picture is gut stasis or bloat until proved otherwise. A rabbit with a gas-distended stomach can deteriorate in hours, and the delay between the owner deciding to wait and see and the rabbit dying is often a single night.
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Decide in 60 seconds

Why a rabbit hides pain so well

Showing pain is a way of dying in the wild.

A rabbit that limps, hunches or falls behind the group is the one a predator selects. Selection has therefore favoured animals that keep their outward behaviour as close to normal as possible for as long as possible, and only collapse when they can no longer compensate.

Dogs and cats are predators and can afford to advertise discomfort. Rabbits cannot, and the practical consequence is that the visible signs appear late and change fast.

A human in the room makes it worse.

To a rabbit, a large animal that walks upright, faces forward and has forward-set eyes is a predator shape. Even a much loved rabbit shifts into a more alert, more masked state when a person enters the room.

This is why the single most valuable diagnostic step available to an owner costs nothing: set a phone recording, leave the room, and watch the footage afterwards. Vets who see rabbits regularly will often ask for exactly this, because the animal in the consulting room is showing them its bravest face.

Pain and gut stasis feed each other.

Rabbit gut motility is exquisitely sensitive to pain and stress. Pain of any origin, a sore tooth, a sore hock, a fractured toe, slows the gut. A slowed gut ferments and produces gas. Gas distends the stomach and caecum, which is itself painful, which slows the gut further.

This is why pain relief in a rabbit is not a comfort measure. It is treatment for the thing that will actually kill the animal, and it is why a vet reaching for an analgesic before a diagnosis is doing the right thing rather than papering over the problem.

The face: five things that change

The rabbit grimace scale is an observational tool developed and validated in the veterinary literature for acute pain. It scores five facial features, each as absent, moderate or obvious. You do not need to produce a number to use it. You need to know what each feature looks like.

The eye tightens.

A comfortable rabbit has a wide, round, fully open eye with the lids not pressing on it. With pain the eyelids narrow and the muscles around the socket contract, so the eye looks squeezed, almond-shaped, or partly closed with a tight rim.

The trap here is sleep. A dozing rabbit also has half-closed eyes, but the surrounding face is loose and it opens them and looks at you when you speak. A painful eye is tight, and stays tight.

The cheeks flatten.

The normal rabbit face is rounded through the cheeks. With pain the cheek muscles pull in and the face looks more angular and more skull-like, with the bone of the cheek more obvious.

This is the hardest feature for an owner to see without a comparison, which is why a clear photograph of your rabbit on a good day is worth taking now.

The nostrils change shape.

At rest a rabbit's nostrils form a rounded, open shape and the nose twitches steadily. In pain the nostrils are drawn in and become a narrower, more vertical slit, and the twitching often slows or stops.

A rabbit that has stopped twitching its nose is not calm. Nose twitching is close to continuous in a conscious, comfortable rabbit.

The whiskers stiffen and move forward.

Normally the whiskers lie loosely out from the face, moving gently as the rabbit sniffs. With pain they stiffen, clump together, and swing forward and down away from the face.

This feature is unusable in a Rex, whose whiskers are short, curled and often broken as a consequence of the coat gene that gives the breed its plush texture. In a Rex, score the other four.

The ears fold, narrow and rotate back.

In an upright-eared rabbit the comfortable ear is open, held loosely upright or angled toward whatever the rabbit is listening to, with a broad cup shape. With pain the ear folds along its length so the cross-section becomes narrow and tube-like, rotates outward or backward, and is held closer to the body.

Ear position is one of the five facial features, and a hands-on check is also when ear-base disease gets found. A rabbit that tolerates this calmly is telling you something useful in itself.

In a lop this feature cannot be scored. The ear is carried down by conformation, and the cartilage does not permit the rotation the scale describes. Lop owners have to work from the eye, cheek, nose and whiskers, and lean harder on posture and behaviour.

What the scale does not do.

It was developed for acute pain and validated largely on still images of laboratory rabbits. It does not reliably detect the low-grade chronic pain of arthritis or slowly progressing dental disease, and heavy facial fur in an Angora or a lionhead can obscure every one of the five features.

Treat it as one tool among several rather than a verdict.

Posture: telling a loaf from a hunch

A true loaf: the spine runs level, the head is up and easy, the ears are loose, and the eye is soft. Nothing about this posture is braced.

This distinction matters more than any other and owners get it wrong constantly, because both postures involve a rabbit sitting still with its feet tucked under it.

The other comfortable postures are worth knowing because their absence is informative. A relaxed rabbit will flop onto its side, sometimes dramatically enough to alarm new owners, and will stretch out flat with its hind legs extended behind it.

A rabbit with abdominal pain will not lie flat and will not flop. If your rabbit used to flop daily and has not flopped in three days, that is data.

Pressing.

A rabbit that repeatedly pushes its abdomen down onto a cool floor, moves, and does it again is showing you where it hurts. This is a classic gut pain behaviour and should be treated as urgent.

The sounds, and the one that is misread

Loud, slow tooth grinding.

A grating, deliberate, audible grind, often with the whole jaw moving side to side and the face tense. This is bruxism and it means pain. It is one of the most reliable signs a rabbit gives, and it is frequently dismissed.

Soft, rapid tooth purring.

A light chattering vibration, usually while the rabbit is being stroked, with a loose relaxed face. This is contentment. The two sounds are genuinely different once you have heard both, and the surrounding body language separates them even if the sound does not.

A scream.

Rabbits scream rarely and it means extreme fear or extreme pain. A rabbit that screams needs a vet, and it also needs to be handled as little as possible on the way.

Grunting, growling and thumping.

These are communication rather than pain in themselves, but a rabbit that has newly started grunting or lunging when you approach a particular part of its body is often guarding a painful area. A gentle rabbit that has suddenly become defensive is a rabbit to examine, not a rabbit with a behaviour problem.

Behaviour: the slow version, and why it is missed

Chronic pain in a rabbit does not announce itself. It removes capabilities one at a time, and each loss is easy to explain away as the animal getting older or calmer.

The usual order is worth memorising, because catching it early is entirely a matter of noticing a step.

First, the highest jump goes.

The rabbit stops getting onto the sofa or the top level of the enclosure. Owners read this as the rabbit losing interest.

Then grooming the rear end goes.

Reaching round to groom the back, rump and genital area requires spinal flexion. A rabbit with spondylosis, arthritis or a sore back stops doing it. The visible result is an unkempt patch over the lower back, dandruff along the spine, and caecotrophs accumulating around the bottom.

This is frequently the first thing an owner actually notices, and it is often misread as a diet problem. A sticky bottom does have dietary causes, but in an older rabbit it is just as likely to be a pain and mobility problem, and the diet change that follows achieves nothing.

Then caecotrophy itself.

Rabbits eat the soft caecotrophs directly from the anus. A rabbit that cannot reach loses a significant part of its nutrition and starts to lose condition, while simultaneously accumulating soiled fur that attracts flies.

In warm weather this chain ends in flystrike, which is why chronic pain in a rabbit is a summer emergency waiting to happen.

Then the litter tray step.

A rabbit that begins soiling outside the tray it has used reliably for years is very often a rabbit that cannot comfortably step over the lip any more. Cutting a low entrance into the tray is both a fix and a diagnostic test.

Then movement generally.

Fewer binkies, less running, more time in one spot, sore hocks developing from sitting on the same surface, and nails that grow unevenly because the rabbit is loading one side more than the other.

What changes the picture

Breed and conformation.

Lops cannot be scored on ear position. Rex cannot be scored on whiskers. Dwarf breeds with shortened faces make cheek flattening and nostril shape harder to judge. Angora and lionhead facial fur hides everything. Giant breeds carry more weight over their joints and get arthritis and sore hocks earlier.

Age.

Slowing down is not a diagnosis. A senior rabbit that has become quiet, stopped jumping and started leaving droppings outside the tray is far more likely to be in treatable pain than to be simply old, and the response to a short course of prescribed pain relief usually settles the question.

Sex and entire status.

An unspayed doe with new abdominal pain, blood-stained urine, or a swollen abdomen may have uterine disease, which is common in entire does and needs prompt investigation.

Companionship.

A bonded partner grooms the parts a painful rabbit cannot reach, which can mask the earliest sign for months. It also means the healthy rabbit's behaviour changes: sudden increased grooming of a partner, or a bonded pair beginning to fight, can both signal that one of them is unwell.

Temperature and season.

Cold and damp make arthritic pain worse. Heat makes everything worse and adds its own emergency.

The routine that catches it early

A grooming session doubles as the weekly examination. Ears forward, eye round, whiskers loose and nose working: this rabbit is alert and comfortable, and that is the reading you want to be able to recognise.

What never to do

Do not give human painkillers.

Ibuprofen, paracetamol, aspirin and codeine are not safe in a rabbit at doses guessed from human packaging. The medications vets use in rabbits are dosed by weight, are species-specific in how they are handled, and are cheap once prescribed. There is no home version of this.

Do not withhold food to rest the gut.

Fasting a rabbit is dangerous in every situation including before anaesthesia. A rabbit cannot vomit, so the reason humans and dogs are fasted before surgery does not apply, and a rabbit whose gut empties is a rabbit in stasis.

Do not decide the rabbit is fine because it ate.

Eating a little is compatible with significant pain. Judge by the amount relative to normal and by the droppings that follow, not by whether anything was eaten at all.

Do not wait until morning on a hunched, grinding rabbit.

The overnight hours are when rabbits with gut pain are lost. If the out-of-hours option feels excessive, phone them and describe the posture and the sound. The person on the phone will tell you honestly.

Do not scruff or flip a painful rabbit to examine it.

Placing a rabbit on its back induces a trance-like immobility that is a fear response, not relaxation, and a rabbit that kicks out during handling can fracture its own spine. Examine on the floor, at floor level, with the rabbit's feet on a non-slip surface.

What the vet will ask for and do

Bring or send in advance:

• The video of the rabbit alone in the room
• A photograph of the face on a normal day and one from today
• A week of dropping photographs and the weight trend
• What it has eaten and refused, with times
• When it last had a flop or a binky
• The highest surface it jumps onto, and whether that has changed
• Its neutering status, age and breed

The examination will include a pain score, palpation of the abdomen for gas, fluid, a firm mass or a doughy stomach, listening for gut sounds in all four quadrants, and a look at the teeth. A conscious dental exam with an otoscope shows only part of the mouth, so a full assessment of the back molars usually needs sedation, and molar spurs cutting the tongue or cheek are one of the commonest hidden sources of rabbit pain.

Radiographs are used for the spine, hips and tooth roots. Blood and urine tests look for kidney disease, bladder sludge and infection.

A vet may also propose an analgesia trial: a short prescribed course, with you watching for a change in behaviour. A rabbit that starts jumping, grooming and eating properly within a few days on pain relief has answered the question, and that is a legitimate diagnostic approach rather than a fudge.

When to get help

Emergency, tonight:

• Hunched with the belly pressed down, teeth grinding loudly
• No droppings passed for several hours, or a sudden collapse in the number
• A distended, drum-tight abdomen
• Screaming, collapse, or complete unresponsiveness
• Straining to urinate with no urine produced

Same day:

• A clear pain face: tight eye, flattened cheeks, narrowed nostrils, stiff forward whiskers
• Refusing food that is normally irresistible
• Sitting in a corner or hiding somewhere new
• New defensiveness when a particular area is approached

Within the week:

• Stopped jumping, stopped flopping, or stopped grooming the rear end
• Droppings accumulating around the bottom in a rabbit whose diet has not changed
• Nails wearing unevenly, or a new sore patch on a hock
• A bonded partner grooming one rabbit far more than before

Register with a rabbit-experienced vet in advance and find out what your local out-of-hours arrangement is. A great many practices see rabbits; considerably fewer are comfortable with a rabbit that is crashing at two in the morning, and that is the number you want stored before the night it matters.