Hit by car
Your animal may be frightened and hurt, so approach with caution.  Use a muzzle if needed to prevent being bitten by an anxious and injured pet.  Check for breathing and a heartbeat.  Check for obvious fractures and bleeding.  Check the gums to see if they are pink and well oxygenated... or pale which might indicate internal bleeding or a shock condition where the patient's blood pressure falls.  If there is active bleeding, apply direct pressure with a clean cloth or bandage material.  If your animal cannot walk, carefully transport it immediately to the veterinarian using a board or a large blanket as a stretcher.  Give careful support to any fractured limbs.  A veterinarian should examine any pet after a vehicle accident in case there is internal bleeding.