If your dog has been bitten by another animal, especially another dog, you may have many immediate concerns. The first thing you need to do is to clean the wound, so an infection doesn't set in, dirt and grime are removed, and bacteria never has a chance to develop. The biggest trick to first aid, whether you're handling a dog or human, is to remain calm. If your dog has been bitten, be sure to separate him from the other animal first and then treat and clean the bite. Other than needing to clean the wound right away, your role at this moment is to keep your pup calm and let him know he's safe and you will care for him.
Your dog may be anxious, angry, and filled with increased adrenaline or incredibly frightened after such an experience. A soft voice, a treat or two, and some empathy goes a long way when you're dealing with an injury to your beloved pet.
Animal fights can be vicious. If your dog has been injured by another animal be sure to check not only the visible wounds but your dog's entire body or other ones you may not notice right away. If your little guy is seriously injured, get him to your veterinarian right away, but if you are treating him at home do so with gentle tender loving care and a good first aid kit.