A. Dr. Ladd's answer below is correct - there are no known interactions between aspirin and ivermectin. However there are several drugs that are more effective at relieving pain in dogs than aspirin, and they are safer to use as well. Rimadyl and Metacam are two that are widely used and have excellent efficacy and safety.
A. Those medications will not interact, but aspirin is never a good idea. It has risky see effects from severe stomach ulcers to reduction in clotting ability. I would be happy to help with herbs or other alternative medications for pain, but I need more information on age, symptoms, history etc. Feel free to schedule a consult and we can discuss.
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