Thank you for the additional information.

f he is not on any medications then Aspirin can be used short term to help with the pain. This is dosed at 5 mgs per pound of body weight every 12 hours. This can cause stomach upset so I would suggest giving with food. If he has any vomiting or stops eating I would suggest contacting your vet to ask for a stronger pain medication, just be sure to tell them that you have used aspirin as this will prevent them from giving certain medications.
Click here for more on the use of aspirin and the precautions

You want to keep an eye out for any swelling. If this is not better in a few days or the aspirin is not helping I would suggest having your vet take a look at him. I would try to limit his activity to potty breaks only for the next 4-5 days no running and no stairs.

I hope this helps and he feels better soon. Please reply back if you have additional questions or concerns

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Candy