Bottom line
Rabbits are obligate nose-breathers, so breathing fast or with the mouth open is an emergency, they can't mouth-breathe for long. Mouth breathing, blue lips, or flared nostrils mean call a vet now.
When to worry (red flags)
- Mouth open while breathing (rabbits shouldn't breathe through the mouth)
- Fast, laboured breathing or flared nostrils
- Blue or pale lips/tongue
- Lethargy, not eating, or hunched posture
- Discharge from the nose or eyes
What to do right now
- Move the rabbit to a cool, well-ventilated, quiet area.
- Keep them calm and minimise handling.
- Note breathing rate and any nasal discharge.
- Call a rabbit-savvy vet immediately and take them in.
Common causes
- Respiratory infection (pasteurella/'snuffles', bacterial pneumonia)
- Heart disease (older rabbits)
- Heat stress or poor ventilation
- Pain or shock from another illness
- Nasal/airway blockage
What to avoid
- Don't stress or handle the rabbit more than needed.
- Don't put them in a hot or dusty environment.
- Don't wait overnight, mouth breathing is life-threatening.
What the vet needs to know
- Breathing rate and whether the mouth is open
- Any nasal/eye discharge or sneezing
- Recent temperature, stress, or illness
Run a free AI triage assessment for personalised next steps, or find an emergency vet near you.
Frequently Asked Questions
Disclaimer: This article is for educational purposes only and is not a substitute for professional veterinary advice. If you're concerned about your pet's health, use our AI triage assessment or consult a licensed veterinarian.
