Administering Fluids to Rabbits
An ill rabbit may not drink enough water on its own to do well. Your rabbit may be dehydrated if you see any of these problems: thick sticky saliva, crusty eyes, poor appetite, small amounts of dark colored urine, or hard dry fecal pellets.
In order to correct dehydration, extra water must be given to your rabbit. Sometimes this can be done by helping the rabbit drink. Some rabbits need to have fluids given by other methods, either by subcutaneous fluids, intravenous fluids, or intraosseous fluids.