[header] How to clean a dog's wound [title] Calm the dog down. [step] Once you notice that your dog is injured, get control of him and calm him down if he's over-excited. Soothe your dog by petting him gently and speaking to him in a low, calm voice. 
Make sure to stay calm yourself, even if you're worried. Your dog can read your body language and knows your voice intonations very well.