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No over the counter pain reliever is safe to use in dogs. Many experts will recommend buffered aspirin for short term pain relief where there is no active bleeding present. Buffered aspirin can be given to a dog with a dosage of up to 5-10 mg per pound every 12 hours for pain. Keep in mind that a dog's body does not metabolize aspirin in the same way as a human and thus should not be given more than a day or two without contacting your Vet. The aspirin may need to clear your dog’s system before other medications can be given, so keep that in mind if you decide to give aspirin and be sure and tell your vet when your dog is seen. Read side effects and precautions here.
While other over the counter pain medications are sometimes used, there is a slim margin between the therapeutic dosage and the toxic dosage. As a result, Ibuprofen, M, Motrin, Advil, Tylenol (acetaminophen) should not be given to your dog as they have health risks associated with them of which some are serious.
You can read more on usage, precautions and dosage information here:
I hope this information is helpful to you.
If I was to give the dog asprin at 5-10 mg per pound then I would be giving him 300 to 600 mgs is that okay? It seems really high.