Several pain relievers are suitable for canine use; however, veterinarian advice should be sought before giving any dog a pain reliever intended for human use. Dogs are as susceptible to overdoses as human beings and should be monitored carefully after being given any medication.
Every dog is different. The ideal amount of pain reliever depends upon the weight of the dog. Some dogs metabolize pain medications more quickly than others and require carefully metered doses to stay pain free and healthy. Others are particularly sensitive to or allergic to certain painkillers.
Accidental overdoses are not uncommon, so it's important to ensure the dog does not receive too much medication. Just two regular aspirin tablets have the potential to cause severe organ damage in medium-sized dogs.