Please note: Information in this post is not meant as a substitute for veterinary care. Always consult your veterinarian in an emergency.
If you are ever in doubt, call your vet. They are your best chance in diagnosing any medical issue that your dog may have. They are also the best trained to treat your dog. After any emergency make sure to call your vet. Untreated wounds or injuries can become severe really quickly.
Calling your vet is also the best thing to do when you notice unusual behavior in your dog. There are cases of dogs becoming really aggressive, from what seemed out of nowhere or really grumpy. Vets found that the dog is in pain.
This is why it is so important to find a good vet that you trust and your dog gets along with.