In general, a passenger may recover in an accident involving an animal such as a deer. These cases usually involve the driver's negligence such as swerving and hitting a fixed object. If your passenger contributed or the vehicle was negligently maintained, a potential claim may be considered. Medical Payments may cover future care and treatment. An individual should carefully review any applicable insurance policy.
You need to consult with an attorney in your location as representing yourself in such an informal situation may not produce all the damages that you may be entitled to such as loss of use or substitute vehicle and in some cases loss of value to the vehicle even if repaired.