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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. Rabbits with lower respiratory infections may also that stick their noses up when breathing. Foreign object such as a hair or a bit of food trapped in a nasal passage. In this case, there would be few symptoms beyond sneezing. A dental problem, such as an infection that has spread to the nose, can cause sneezing. This would cause other cold-like symptoms, such as a runny nose, and is most likely in older rabbits.  Again, a veterinarian should make a formal assessment, but you can come prepared with your opinion and information regarding symptoms to help. Not all vets will see rabbits. Those who say they will may not always have enough background with rabbits to correctly evaluate your pet. Ask rabbit owners for vet referrals and search online for rabbit-savvy vets in your area. Always read reviews before making an appointment. Take the rabbit to the vet in a carrier or a well-ventilated box, and provide water in the pet carrier for your rabbit in case they need to drink. Many carriers now come with food and water dishes built in. Your pet's safety is the main thing when choosing a carrier, so find the right one for your needs before bringing your sick rabbit to the vet. Choose from crates, slings, and more. You can talk to a pet store owner or ask the vet over the phone what kind of carrier you should purchase if you don't already have one. The vet may have to do different tests, along with a physical exam, to determine the cause of the problem. Your appointment length will depend on what tests the vet feels the need to conduct.  Some vets ask that you bring in a stool sample for testing. This sample should be less than 24 hours old.  Your vet may want to do a blood tests, where blood will be drawn from your rabbit. They might also take a sample of any nasal discharge on which to run tests. These tests will help determine what kind of antibiotic will be best to help your rabbit fight the infection, if applicable. Be sure to tell the vet everything about your rabbit's home, from what your rabbit eats to what kind of bedding he uses. It may be something as simple as a change in bedding that puts an end to the sneezing.
Observe your rabbit. Find a veterinarian who has experience with rabbits. Bring the rabbit to a veterinarian. Allow the veterinarian to assess the problem.