rabbit respiratory health: what sneezing actually means
This article expands on our original thoughts on upper respiratory infections - with fall in full swing, it felt like the right time to revisit it.
A Case Study
One of our boarding guests came to us sneezing; not constantly, just occasionally. His vet was not alarmed - his family had been told it was likely a hay allergy and he seemed otherwise well.
Over the following ten months, what turned out to be aspiration pneumonia progressed into a severe abscess. The abscess displaced his lungs upward and his stomach downward. Despite aggressive treatment, he passed on.
We share this not to frighten you, but because we wish someone had told his family sooner: sneezing in rabbits is never just sneezing.
NOTE: Rabbits Cannot Get COVID
This comes up every fall and winter as respiratory illness circulates in human households. Rabbits are not susceptible to SARS-CoV-2. A rabbit sneezing in September is not sneezing because of COVID. This is not a reason to dismiss the sneeze - it is a reason to look for the actual cause rather than attributing it to something it cannot be.
What Sneezing Actually Means
Sneezing in rabbits falls into two broad categories: irritation and infection. They can look identical from the outside, but they have very different implications.
Environmental Irritation
The most common cause of sneezing in otherwise healthy rabbits is dust - most often from hay. This is frequently misidentified as a "hay allergy." True hay protein allergy in rabbits is possible, but rare. What most rabbit parents are seeing is mechanical irritation from hay dust particles, not an IgE-mediated immune response to grass protein. The distinction matters because the management is different: low-dust hay, good ventilation, and eliminating other environmental irritants - not antihistamines.
On the topic of antihistamines: diphenhydramine (Benadryl) is occasionally prescribed for sneezing rabbits. Its use in rabbits is not well-studied, is not standard of care, and carries real risk. Antihistamines can slow GI motility in a species already prone to stasis. If a vet is recommending Benadryl for your sneezing rabbit without ruling out infection first, we would encourage a second opinion from a rabbit-savvy exotic vet.
Other environmental triggers include ammonia from soiled litter, household cleaning products, scented candles and air fresheners, cigarette smoke, and essential oil diffusers. Rabbits have sensitive respiratory systems. What smells mild to you can be genuinely irritating to them.
Upper Respiratory Infection
Pasteurella multocida is the most common bacterial cause of upper respiratory infection in domestic rabbits - commonly called snuffles. It presents as sneezing, nasal discharge, and wet front paws from wiping the nose. The wet paws are the detail most rabbit parents miss or dismiss. If your rabbit's front paws are consistently damp or matted, that is not normal. That is a rabbit who has been wiping discharge from their face.
Other bacterial, viral, and fungal causes of respiratory infection exist in rabbits. Aspiration pneumonia, what happens when a rabbit inhales food or liquid into the lungs, is less common but can be catastrophic, as we witnessed firsthand.
Dental Disease
Rabbit teeth roots sit in close proximity to the nasal passages. Dental abscesses, molar spurs, and elongated tooth roots can all cause nasal discharge and sneezing that have nothing to do with the respiratory system directly. This is one of the reasons a thorough exotic vet workup, including dental assessment, is essential when sneezing is persistent.
When to Be Concerned
A single sneeze after shaking a dusty hay bale is not an emergency. Here is when to call your exotic vet:
Sneezing that persists for more than 24-48 hours
Any nasal discharge: clear, white, yellow, or bloody
Wet or matted front paws
Changes in breathing: noisy, labored, or faster than usual
Reduced appetite or inappetence
Lethargy or posture changes
Clicking, crackling, or rattling sounds when breathing
Bond fragility: a bonded pair that begins to show tension or distance may be responding to a sick partner before you can identify the illness yourself
That last point is worth dwelling on - rabbits are prey animals who mask illness. Their bonded partner often detects illness before their human does. If a previously harmonious bond is suddenly showing strain, rule out health issues in both rabbits before assuming the bond itself has changed.
What BCB Does When We Suspect a URI
At BCB, we contact families the moment a boarding guest sneezes - immediately.
This is not an overreaction. It is the standard we hold because we have seen what happens when sneezing is dismissed. We would rather make an unnecessary call than miss something that matters.
We also monitor for wet paws, changes in posture, changes in eating, and any shift in a bonded pair's dynamic. These are the early signals that a rabbit-savvy caregiver learns to read - and the signals that a non-specialist facility may not notice at all.
NOTE: Hay Allergies
If your rabbit is sneezing and a vet has attributed it to a hay allergy without ruling out infection, dental disease, and environmental irritants - please seek a second opinion from a rabbit-savvy exotic vet.
Hay is not optional for rabbits. It is their primary food source and the foundation of GI and dental health. A rabbit cannot simply be taken off hay. If sneezing is attributed to hay without a thorough workup, the risk is that an underlying infection goes untreated while the rabbit continues to sneeze - and potentially deteriorates.
A 2021 paper by Dr. Vladimír Jekl in Veterinary Clinics of North America: Exotic Animal Practice underscores this point. A rabbit presenting with chronic sneezing had positive skin allergy testing to meadow grasses - a result that might reasonably lead a clinician toward an allergy diagnosis. The actual cause was a 4cm grass foreign body lodged in the nasal cavity. After endoscopic removal and treatment of the secondary bacterial infection, the rabbit recovered fully. The allergy test was real, but the allergy was not the problem.
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