Common Rabbit Health Problems: GI Stasis, Snuffles & Emergency Signs

A rabbit that hasn’t eaten in eight hours is a medical emergency. I can’t soften that sentence, because every year I treat healthy rabbits whose owners waited a day or two to see if the appetite came back on its own. In a herbivore with a digestive tract built for constant motion, twelve hours of stasis can become irreversible. Twenty-four hours without food means the gut wall is starting to fail. These are facts, not warnings.

TL;DR: GI stasis (gut shutdown) is the leading cause of death in pet rabbits — losing appetite for 8+ hours means an emergency vet visit. Snuffles (Pasteurella) looks like a cold but can become a lifelong chronic condition. Fly strike kills within hours and is almost always preventable. Dental spurs from overgrown molars cause rabbits to stop eating. All of these conditions share the same early sign: your rabbit is eating less than yesterday. Track appetite, stool output, and behavior daily.

Why rabbits hide everything

Rabbits are obligate prey animals. In evolutionary terms, a rabbit that looks weak gets eaten — so their entire biology suppresses visible signs of illness. A rabbit with a brewing health crisis will sit normally in the corner of their enclosure with a neutral expression while their gut is actively shutting down. Owners see a rabbit that looks “a little quiet” and assume they’ll perk up tomorrow. By tomorrow, the bloodwork is already showing hepatic lipidosis.

The single most reliable early warning system is this: know exactly how much your rabbit eats every day and what their fecal pellets normally look like. A rabbit that ate half their usual pellets or produced noticeably smaller droppings overnight is a rabbit that needs attention now, not after work. Buy a small kitchen scale and weigh your rabbit weekly. A sustained drop of five percent or more — about two and a half ounces for a three-pound rabbit — is cause for investigation whether or not they “look fine.”

GI stasis: when the gut stops

Gastrointestinal stasis is exactly what it sounds like. The entire digestive tract slows down or stops. Gas builds up. The stomach distends. Pain sets in, which suppresses appetite further, which strips the gut of the fiber it needs to restart itself — a feedback loop that kills in under forty-eight hours.

The triggers are frustratingly common: a sudden change in pellets. A stressful event like a vet visit or a new pet in the house. An underlying dental problem that makes chewing hay painful. Dehydration from a clogged water bottle. Even a heavy molt can cause stasis — rabbits ingest fur while grooming, and a hairball can physically obstruct the digestive tract.

A rabbit in stasis presses their belly to the floor. They grind their teeth — a sound called bruxism, which indicates significant pain. Their ears feel cold to the touch because blood flow diverts away from the extremities. Fecal pellets shrink in size and number, then stop entirely. If you see these signs, do not offer pineapple juice or infant gas drops or anything else you found on a forum. The rabbit needs subcutaneous or intravenous fluids, injectable pain medication, and motility agents — all of which require a veterinarian.

Every hour counts with stasis: rabbits treated within the first twelve hours of not eating have a far better outlook, while one that has gone a day or more without food — or without producing stool — is fighting for its life. The clock starts the moment your rabbit stops eating, not the moment you notice.

Snuffles: the cold that never goes away

Snuffles is the common name for upper respiratory infection caused primarily by Pasteurella multocida, a bacterium that lives in the nasal passages of many asymptomatic rabbits. Under stress, the bacteria bloom. The rabbit develops sneezing, thick white or yellowish nasal discharge, and crusting around the eyes. They swipe at their nose with both front paws, leaving those paws matted and stained — a telltale sign you can spot from across the room.

Untreated, Pasteurella moves from the upper respiratory tract to the middle and inner ear, causing head tilt, loss of balance, and a condition called torticollis where the rabbit’s head is permanently twisted to one side. Once the inner ear is involved, treatment becomes long and difficult. Some rabbits never fully recover their balance. Others become chronic carriers who flare up under stress for the rest of their lives.

Antibiotics prescribed by an exotic vet — typically enrofloxacin or trimethoprim-sulfa — can knock snuffles back if caught early. The home environment matters too. Dusty hay, ammonia buildup from urine-soaked bedding, and poor air circulation all irritate the respiratory tract. A clean cage with good ventilation is your rabbit’s immune system’s best friend.

Fly strike: fast, gruesome, preventable

Fly strike — myiasis — is the one condition that makes every rabbit vet I know visibly angry. It shouldn’t happen. It’s almost always preventable, and when it does happen, it’s devastating.

Here is how it works: a fly lands on the rabbit’s rear, drawn by the scent of urine or feces on soiled fur. The fly lays eggs. Within twelve hours, those eggs hatch into maggots, which then burrow into the rabbit’s skin and begin eating living tissue. By the time the owner notices, the rabbit has an open wound crawling with larvae.

Rabbits at highest risk: obese rabbits who can’t reach their rear to clean it, elderly rabbits with mobility issues, rabbits with diarrhea or chronic soft stool, and any rabbit housed outdoors where flies have unrestricted access. If your rabbit has a dirty bottom, clean it. If your rabbit can’t clean itself, you clean it. Every day. A once-weekly cage scrub doesn’t prevent fly strike. Daily observation does.

Teeth that never stop

Like all lagomorphs, a rabbit’s teeth grow continuously — the front incisors at roughly two to three millimeters per week. This is why hay is the foundation of their diet — the grinding motion of chewing fibrous grass wears the teeth down evenly. When a rabbit doesn’t chew enough hay, the molars overgrow into sharp points called spurs that dig into the tongue and the inside of the cheeks. Eating becomes painful. The rabbit stops eating. You’re back to GI stasis.

Front teeth that are visibly overgrown or misaligned are easy to spot. Molar spurs are not — they sit in the back of the mouth and can only be seen with an otoscope during a veterinary exam. This is why annual wellness visits are not optional for rabbits. A rabbit whose molars are developing spurs will sometimes drool, rub their chin on surfaces, or show interest in food but then drop it from their mouth without eating it. Those are late-stage signs. Dental disease is a slow, silent process right up until it isn’t.

RHDV2: the virus flying under the radar

There’s one disease I want every owner to bring up at their next checkup: Rabbit Hemorrhagic Disease Virus type 2 (RHDV2). It’s a highly contagious, frequently fatal virus that has spread across North America since 2020, and it kills fast — sometimes with no warning at all beyond sudden death. It spreads through direct contact, contaminated food and bedding, and even on shoes and clothing, and it can survive in the environment for months.

The good news is that a vaccine exists now, and any rabbit-savvy vet can administer it. If your rabbit ever goes outside, shares a household with other rabbits, or lives anywhere RHDV2 has been confirmed, vaccination isn’t optional — it’s the single best protection you can buy. Indoors-only rabbits in low-risk areas should still ask an exotic vet whether it makes sense. Add basic hygiene — wash your hands between rabbits, quarantine any new arrival for two weeks, and never share equipment between bunnies from different households — and this disease is very preventable.

Uterine cancer: the case for spaying your doe

If you have a female rabbit, one statistic should settle the spay question for you: unspayed does have up to an 80% chance of developing uterine adenocarcinoma by around age four. That isn’t a rare tragedy. It’s the most common reason older, unspayed female rabbits end up in my clinic, and it’s usually caught late — by the time it shows up as blood in the urine, lethargy, or weight loss, it has often already spread.

Spaying a doe before she’s about two years old essentially eliminates that risk, and it’s also what makes litter training and steady behavior possible in the first place. It’s abdominal surgery, so it costs more than a neuter and needs a vet who knows rabbit anesthesia — the rabbit cost guide breaks down the price. But the math is simple: one procedure versus an 80% risk of cancer. There’s no version of that decision where skipping the surgery is the safer bet.

The antibiotics that can kill a rabbit

One warning that comes up more than it should: never give a rabbit antibiotics meant for people, cats, or dogs without an exotic vet’s say-so. Oral drugs in the penicillin family — amoxicillin, ampicillin, and their relatives — along with clindamycin, can wipe out the healthy bacteria in a rabbit’s gut and trigger a fatal enterotoxemia within days, even at a normal dose. It’s one of the most dangerous home-remedy mistakes in rabbit care. When a rabbit genuinely needs antibiotics, a vet prescribes rabbit-safe options like enrofloxacin or trimethoprim-sulfa. Whatever is in your own medicine cabinet stays there.

When to go now, when to go tomorrow

Not everything is an emergency. A single sneeze in an otherwise active rabbit with a good appetite probably means dusty hay — watch and wait. But certain constellations of symptoms demand immediate action:

Go to an exotic vet immediately if your rabbit: hasn’t eaten in eight hours, is producing no stool or abnormally small stool, is grinding teeth while hunched, has labored or open-mouth breathing, has white discharge from the nose, has flies on or around their rear end, or has a head tilt with loss of balance.

Go to a vet within twenty-four hours if your rabbit: has mild appetite reduction but is still eating some hay, has clear nasal discharge without breathing difficulty, is scratching one ear persistently, or has soft stool that hasn’t improved after pulling treats from the diet.

Prevention across every condition on this list comes back to the same three things: unlimited Timothy hay for dental and digestive health, a clean indoor environment checked daily, and a relationship with an exotic vet established before you ever have an emergency. Rabbits are fragile in ways most people don’t understand until they’re sitting in a waiting room at midnight counting the hours. Don’t wait to learn the hard way. Read our guide on what rabbits should eat every day, and give them a home setup that makes proper housing and hygiene the easiest thing in the world.