If you encounter wildlife crossing the road, even if it is slow, do not try to move the animal. Stop and let it cross naturally.
If you encounter a wounded animal, it would be best to call an authority. Alternatively, note the location so that when you arrive at your hotel, you can let the front desk know. The hotel staff can then contact the appropriate parties.
People in Costa Rica let their dogs run free. Dogs will often walk along the road since there are not many towns with sidewalks, or they might cross the road unaware of traffic. Keep an eye out for them!
