There's a dog, he's been run over by some vehicle. His leg is most probably broken, his skin has been badly damaged. I'm worried that there's no veterinary hospital nearby, he might develop maggots eventually due to open wound. Please guide me through.
Ask a doctor / nurse to treat him. The basic anatomy of a flesh wound and broken leg should be similar enough to a human that the dog does not have to go without any treatment. Put a muzzle on him, try to calm him and hold him still during the procedure.
From experience I know that you can give him Aspirin against pain and infection in a dosage appropriate to his body weight. That is half or a quarter of a pill, depending on his size and weight. Ibuprofen is poisonous for dogs.