Common Rabbit Illnesses and Warning Signs

Author: Elliott Garber, DVM

Rabbits are prey animals, so they hide illness until they are genuinely in trouble. By the time a rabbit looks obviously sick, the clock is often already running. The conditions worth knowing on sight are gut slowdown (GI stasis), snuffles (upper respiratory infection), overgrown teeth, ear mites, flystrike, head tilt, uterine cancer in unspayed females, and the deadly virus RHDV2. Learn the general warning signs below, know which ones are true emergencies, and build a relationship with a rabbit-savvy (exotics) veterinarian before you ever need one.

The warning signs that apply to almost everything

Because rabbits mask discomfort, learn a short list of danger signs and act on any of them. Call your veterinarian if you see:

• Not eating, or eating much less than normal
• No droppings, or noticeably fewer and smaller droppings
• A hunched, tucked posture and reluctance to move
• Tooth grinding (loud, forceful grinding usually signals pain, not contentment)
• Drooling or a wet chin and dewlap
• Discharge from the nose or eyes, or matted fur on the inside of the front legs from wiping the nose
• A head tilt or loss of balance
• Labored, fast, or open-mouth breathing (rabbits breathe through the nose, so mouth-breathing is serious)

None of these are conditions you treat at home. They are your cue to get a rabbit in front of a vet. Missing even a single meal can be the first sign of a serious problem, and with rabbits, waiting is the mistake. A quick daily note of appetite, water, and droppings makes it easier to tell your vet exactly when things changed, and you can log those observations in a rabbit’s health and medical records so the timeline is ready when you call.

GI stasis: the one every rabbit owner must know

Gastrointestinal stasis is the most common life-threatening emergency in pet rabbits, and it is exactly what it sounds like: the gut slows or stops moving. Rabbits are hindgut fermenters built to process a near-constant flow of fiber, so when the gut stalls, gas builds, painful cramping sets in, and the rabbit feels too miserable to eat, which slows the gut further. The House Rabbit Society describes it as a silent killer for good reason.

The signs are the general red flags above, concentrated: appetite drops, droppings get smaller and fewer or disappear, the rabbit hunches and grinds its teeth, and the belly may be silent or full of loud, painful gurgles. Rabbit welfare groups generally advise treating a rabbit that has not eaten or passed stool for around 12 hours as an emergency, and refusing food for even a few hours warrants a call. Left untreated, stasis can kill within hours.

Do not force-feed, medicate, or “wait it out” on your own. Stasis has many possible triggers (dental pain, dehydration, stress, an unrelated illness), and the vet’s job is to find and treat the cause while relieving the gut. See the rabbit GI stasis guide for prevention and what to expect at the clinic. The single best prevention is a hay-first diet, covered in the rabbit diet guide.

Snuffles (upper respiratory infection)

“Snuffles” is the common name for upper respiratory infection in rabbits, most often associated with the bacterium Pasteurella multocida, though other bacteria can be involved. According to the Merck Veterinary Manual, the early sign is a thin, watery discharge from the nose and eyes that later turns thick and white or yellow. A classic tell is matted, crusty fur on the inside of the front legs from wiping the nose. Affected rabbits sneeze and may cough.

Snuffles is contagious, and a large share of apparently healthy rabbits can carry Pasteurella without showing signs, which is one reason careful introductions matter in a multi-rabbit home. Because respiratory disease can advance to the lungs, any nasal or eye discharge, sneezing, or labored breathing is a reason to see the vet rather than watch. Diagnosis and antibiotic choice are a veterinary decision, and the wrong antibiotic is genuinely dangerous in rabbits (more on that below).

Overgrown teeth and malocclusion

A rabbit’s teeth grow continuously for life, staying the right length only through constant grinding against each other and against fibrous food. When the teeth do not meet correctly (malocclusion), they overgrow, form sharp spurs, and can cut into the cheek or tongue. VCA Animal Hospitals and the House Rabbit Society both flag dental disease as one of the most common rabbit health problems, and it frequently hides behind vague signs.

Watch for drooling and a wet chin, dropping food or turning away from hay, weight loss, tear staining or a runny eye on one side, pawing at the mouth, or reluctance to groom. Overgrown molars are hard to spot from the outside, so a vet who can examine the back teeth is essential. Do not clip or file a rabbit’s teeth yourself: incisor trimming done wrong shatters teeth, and molar work needs sedation. A hay-heavy diet is the main preventive lever, and routine care is covered in the rabbit nail and dental guide.

Ear mites

Ear mites (Psoroptes cuniculi) irritate the lining of the ear and produce thick, crumbly brown or tan crusts, sometimes called ear canker. The Merck Veterinary Manual notes the crusting can become extensive, with moist, reddened, painful skin underneath. Signs include head shaking, scratching at the ears, a drooping ear, pain when the ears are touched, and visible debris deep in the ear.

Resist the urge to pick or peel the crusts off, which is painful and can damage the ear. This is treatable, but the medication and any pain relief should come from your vet. Ignored, ear disease can progress deeper and contribute to head tilt.

Flystrike: a summer emergency

Flystrike (myiasis) is one of the fastest-moving emergencies in rabbit keeping and belongs on every owner’s summer radar. Flies, often greenbottles or bluebottles, lay eggs on a rabbit’s fur, typically around a soiled or damp rear end. The eggs can hatch within hours, and the maggots burrow into the skin and feed on tissue, causing severe wounds. Welfare organizations warn that flystrike can become fatal within about 24 hours.

Most at risk are rabbits with a dirty or wet bottom, urine scald, diarrhea, obesity, or dental or mobility problems that stop them grooming. In warm months, check your rabbit’s rear end, tail base, and underside at least once a day and twice daily in hot weather. If you see fly eggs (they look like tiny grains of rice), maggots, a foul smell, or raw, wet, or wounded skin, this is a call-the-vet-now emergency. Do not submerge the rabbit in water, which can cause shock. A clean living area and a dry, unmatted bottom are the core prevention.

Head tilt (torticollis)

A head that tilts persistently to one side, sometimes with loss of balance, rolling, or flicking eye movements, signals vestibular (balance system) disease. The two most common causes are a middle or inner ear infection and Encephalitozoon cuniculi (E. cuniculi), a microscopic parasite that can affect the nervous system. House Rabbit Network notes that rabbits can carry E. cuniculi for a long time without signs, then show symptoms suddenly when stressed or run down.

Head tilt looks dramatic, but many rabbits recover well when treated promptly and supported through the acute phase, so get to the vet quickly rather than assuming the worst. Speed matters practically: a dizzy, disoriented rabbit often stops eating, which can tip it straight into GI stasis. Because treatment differs depending on whether the cause is infection or parasite, diagnosis is a job for the vet.

Uterine cancer in unspayed females

Uterine adenocarcinoma is common in unspayed female rabbits, and the risk climbs steeply with age. Veterinary sources describe the incidence rising into the majority of does by roughly five to six years of age if never spayed, while rabbit.org and exotics practices note that spaying, which removes the uterus and ovaries, essentially eliminates that risk. Spaying also prevents unwanted litters and can reduce certain hormonal and behavioral issues.

Early uterine disease is easy to miss. Possible signs include blood in the urine or bloody discharge, reduced appetite, low energy, or a change in behavior, but many cases show little until advanced, which is why prevention beats detection. If you have an intact female, this is the strongest single argument for a spay, ideally done young. The tradeoffs, timing, and recovery are covered in the rabbit spay and neuter guide.

RHDV2: a deadly virus with a vaccine

Rabbit hemorrhagic disease (RHDV2) is a highly contagious, frequently fatal virus that has spread among domestic and wild rabbits across large parts of the United States and other countries. Per the USDA Animal and Plant Health Inspection Service, it has a very high mortality rate, and infected rabbits can die suddenly, sometimes with few warning signs and sometimes with fever, lethargy, loss of appetite, difficulty breathing, or bleeding. There is no cure once infected, so prevention is the whole game.

The important news is that a vaccine exists and is available through veterinarians in many regions. In the United States it has been offered under a USDA conditional license and is given by a vet, usually as an initial course with an annual booster. Availability varies by state and country, so ask your rabbit-savvy vet or your state animal health authority whether vaccination is offered where you live. Basic biosecurity helps too: the virus is hardy and travels on clothing, shoes, hay, and equipment, so wash up after handling other rabbits and be cautious sourcing greens and hay from areas with known outbreaks.

The one medication rule that saves lives

This is the single most important safety point in rabbit medicine. Never give a rabbit oral penicillin-class antibiotics, meaning penicillin, amoxicillin, ampicillin, and similar drugs, and be cautious with the related clindamycin and lincomycin. In a rabbit these can wipe out the normal gut bacteria and let dangerous Clostridium organisms take over, causing a fatal condition called enterotoxemia, sometimes after a single dose, as documented in the Merck Veterinary Manual.

The practical rule is simple: every medication a rabbit receives should be prescribed by a rabbit-savvy veterinarian who knows which drugs are safe and how to dose them. Do not reach for a leftover pet medication, a dog or cat prescription, or anything from a feed store, and do not dose a rabbit yourself. There are antibiotics rabbits tolerate well, and choosing among them is exactly the judgment your vet is for.

Frequently asked questions

How fast is “an emergency” with a rabbit?

Faster than most people expect. A rabbit that has stopped eating or passing droppings should be seen the same day, often within hours. Flystrike and RHDV2 can turn fatal in about a day or less. When in doubt, call your vet rather than waiting to see if it passes.

Do I really need a special vet for a rabbit?

Yes. Rabbits have unusual anatomy, gut physiology, and drug sensitivities, and not every clinic that sees dogs and cats is comfortable with them. Find a rabbit-savvy or exotics vet before an emergency, and add their number where you can grab it fast. Keeping a rabbit’s history on its Creatures profile, and adding a record after each visit, means you can hand over an accurate timeline in a hurry.

What can I do at home to prevent most of this?

A hay-first diet, clean and dry housing, daily observation of appetite and droppings, spaying or neutering, keeping vaccinations current where RHDV2 vaccine is available, and routine vet checks prevent or catch the majority of common problems. Creatures can send you reminders for upcoming care so checkups and vaccine boosters do not slip.

My rabbit is grinding its teeth. Is that purring?

Soft tooth clicking during petting can signal contentment, but loud, forceful grinding is usually pain and often accompanies GI stasis or dental disease. Paired with a hunched posture or an off-food rabbit, treat it as a warning and call your vet.

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