what is the best treatment for osteoarthritis in dogs?

Can you answer chef1day47’s question about Arthritis?:

My 9 year old bulldog was given previcox for treatment of osteoarthritis. His symptons were improving but now have taken a turn for the worse. He is in pain and I have used all of his meds. The vet won’t be available until Friday. Is there anything I can give him over the counter untill then for pain?

Causes Of Arthritis