Summarize the following:
Although your Havana rabbit should be healthy with a proper diet and habitat, she should be taken in once a year to the veterinarian for a check-up. Your vet will give her a physical examination to make sure she is growing properly, is healthy overall, and that her teeth are growing in correctly and aren't too long. If her teeth are too long, she may need to have her teeth trimmed by your vet to ensure she can eat correctly and so they won't cause problems. If you are not planning on breeding your rabbit, you should have her spayed (or neutered if your rabbit is male). This should be done when she is four to six months old. This will help prevent unwanted breeding as well as stop aggressive behaviors and prevent cancer or infections in her reproductive system. Although you take care of your rabbit, she may get sick. If you notice anything out of the ordinary, you should take her to the vet immediately. Common symptoms to look out for that signal that you rabbit may be sick include:  Decrease or halt in appetite or water consumption Diarrhea Lack of defecating for 24 hours Discharge from the eyes or nasal passage Drooling, which may be a sign of overgrown teeth Swelling or reddening of the skin Loss of the fur anywhere on her body Inability to use her back legs, which makes it difficult for her to hop or move her back legs Dark or red urine Fever, which is a temperature of more than 105 °F

Summary:
Have regular checkups. Spay or neuter your pet. Look for common symptoms of sickness.