A rabbit that is shaking and breathing fast is showing signs of pain, fear, overheating, or illness. A healthy rabbit at rest breathes 30 to 60 times per minute, so anything noticeably above that range, especially combined with trembling, signals that something is wrong. Some causes are minor and resolve on their own, but several are life-threatening, so understanding what else your rabbit is doing will help you figure out how urgently you need to act.
Fear and Stress: The Most Common Cause
Rabbits are prey animals, and their first response to anything frightening is to freeze, tremble, and breathe rapidly. Loud noises, unfamiliar people, a new environment, nearby predators (even a dog barking in another room), or rough handling can all trigger this response. A scared rabbit will typically press its body low to the ground, flatten its ears against its back, and have wide eyes with visible whites.
If your rabbit started shaking after a specific event like a loud sound or being picked up, stress is the most likely explanation. Move them to a quiet, dimly lit area and let them calm down without handling them. Most rabbits recover within 10 to 30 minutes. If the shaking and fast breathing continue well beyond that, something else is going on.
Overheating and Heatstroke
Rabbits are extremely sensitive to heat. Their comfortable range is 59 to 77°F (15 to 25°C). Heat stress begins when room temperature rises above 86°F (30°C), and above 95°F (35°C), rabbits lose the ability to regulate their body temperature entirely, which leads to organ failure. Because rabbits can’t pant effectively and can’t sweat, they rely on their ears to release heat, and when that isn’t enough, their breathing rate climbs sharply. This rapid breathing actually creates a dangerous chemical imbalance in the blood by expelling too much carbon dioxide.
Signs of heatstroke include rapid, shallow breathing, trembling, stretching out flat on the ground, hot ears that are flushed red, drooling, and eventually limpness or unresponsiveness. If you suspect heatstroke:
- Move your rabbit to the coolest room in your home immediately.
- Wet their ears with cold tap water first, then slowly dampen the rest of their body. Keep water away from their nose and mouth.
- Place them on top of a cold, wet towel (not wrapped in one, which traps heat).
- Create airflow with a fan or open windows.
- Offer cold water to drink, but don’t force it.
Do not cuddle or wrap your rabbit during cooling. Get to a vet as quickly as possible even if they seem to improve. A rabbit’s normal internal body temperature is 101 to 103°F (38.3 to 39.4°C), and heatstroke can cause internal damage that isn’t visible from the outside.
Pain From GI Stasis
Gastrointestinal stasis is one of the most common and dangerous conditions in pet rabbits, and pain from a slowed or stopped digestive system frequently causes trembling and fast breathing. A rabbit’s gut needs to keep moving constantly. When it stalls, gas builds up, causing significant abdominal pain.
The key signs that point to GI stasis are a rabbit that has stopped eating, is producing fewer or no droppings, seems hunched or reluctant to move, and has a tight or bloated belly. Rabbits in pain also show specific facial changes: their eyes narrow or squint, their cheeks look flattened, their whiskers press back against the face, and their ears are held tense and rotated backward. These indicators, known collectively as the Rabbit Grimace Scale, are reliable ways to assess how much discomfort your rabbit is in.
GI stasis is always secondary to something else. It can be triggered by dehydration, a low-fiber diet, dental problems, arthritis, or even stress. It requires veterinary treatment because a complete obstruction (sometimes from ingested fur) can be fatal without intervention. If your rabbit hasn’t eaten or pooped in 12 hours and is trembling, this is an emergency.
Respiratory Infection
Rabbits are obligate nose breathers, meaning they physically cannot breathe through their mouths. This makes any nasal congestion potentially dangerous. Upper respiratory infections, often caused by bacteria like Pasteurella, can partially block the nasal passages and force a rabbit to breathe much harder and faster than normal. You may hear sneezing, see a runny nose with white or yellowish discharge, or notice matted fur on the inside of the front paws where they’ve been wiping their face.
A rabbit breathing with its mouth open is in a true respiratory crisis. This means the nasal passages are so compromised that the rabbit is doing something its body was not designed to do. Open-mouth breathing in a rabbit is always an emergency requiring immediate veterinary care. Even without open-mouth breathing, any respiratory difficulty that lasts more than a few minutes warrants urgent attention, because stress from struggling to breathe can, on its own, be fatal in rabbits.
Rabbit Hemorrhagic Disease
Rabbit Hemorrhagic Disease Virus 2 (RHDV2) is a highly contagious and often fatal virus that has been spreading in domestic and wild rabbit populations. Infected rabbits may develop a fever, lose interest in food, and show respiratory or neurological signs, including trembling and labored breathing. In many cases, though, the only sign is sudden death, sometimes with a blood-stained nose from internal bleeding.
RHDV2 is worth knowing about because it can be carried indoors on shoes, clothing, or hay, even if your rabbit never goes outside. Vaccines are available in many regions, and if your rabbit is unvaccinated and showing sudden, unexplained symptoms, mention this concern to your vet.
How to Assess Your Rabbit Right Now
Start by checking the environment. Is the room above 80°F? Is there an obvious source of stress like a loud noise or another animal? Next, look at your rabbit’s behavior beyond the shaking. Are they eating? Have they pooped in the last several hours? Are their eyes bright or squinted? Are their ears hot and red, or cold and pale? Is there any nasal discharge?
A rabbit that is shaking but still eating, still producing droppings, and calms down within 15 to 20 minutes in a quiet space was likely just scared. A rabbit that is shaking and has stopped eating, has no recent droppings, feels unusually hot or cold, has discharge from the nose, or is breathing with an open mouth needs veterinary care right away. Rabbits deteriorate quickly, and because they instinctively hide illness, visible symptoms often mean the problem is already advanced.