The similarities of the metabolism in both dogs and humans make it possible to use certain human medicines on dogs. To treat pain from injury or arthritis, there are several over the counter pain medications that can be used.
Aspirin is good for a dog's aches and pains. It can help reduce inflammation, but can cause an upset stomach.
Glucosamine is a common ingredient added to mature dog food and many dog treats. It helps reduce pain associated with arthritis, and helps maintain healthy joints. Supplements can be found at any vitamin store.
Consult Your Veternarian
As with any dietary changes or medicines, consult with your veterinarian about the proper dosages. The right amount is determined by your dog's size and weight, liver health, age and breed.
Use Only as Needed
As with all medicine, just because it's over the counter doesn't mean it can't have harmful effects if misused or over-used. Too much of these medicines, along with a diet high in meat, can strain your dog's liver and lead to a much greater problem than the pain it is experiencing.
Tylenol (acetaminophen) is a very common pain reliever in humans and something most people wouldn't think twice about, since aspirin is a common pain remedy for dogs. However, Tylenol is very toxic to a dog's liver and can be deadly.