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How to care for a sneezing rabbit
Observe your rabbit.
Before taking your rabbit to a veterinarian, try to assess for yourself why the rabbit may be sneezing. Monitoring symptoms can help you better aid the vet in determining what's wrong.
Your rabbit could have an upper respiratory infection, which may manifest with runny nose, runny eyes, and sneezing. It could also be a lower respiratory infection, which would include symptoms like loud breathing.