Yes. Injury is possible in pets just like it is in people. You will want to go ahead and see your vet tomorrow for an exam and possibly even an x-ray to find out what's going on.
Your vet might want you to give him some aspirin tonight to help with pain. You can give him a call and find out. If he agrees, you can get dosage information and read about precautions here:
http://www.school-for-champions.com/animalhealth/aspirin.htm
Then let me know if you still have questions.
