Rimadyl Dog Arthritis Treatment is non-steroidal anti-inflammatory drug (NSAID) pain medication for dogs used to reduce inflammation caused by arthritis and other joint problems, including hip dysplasia. Rimadyl, a brand of carporfen, can also be used to treat surgery pain and reduce fever. Rimadyl for dogs works by reducing the hormones that cause pain and inflammation and the scored caplets are easy to administer. Maintain your dogs activity level and quality of life with Rimadyl, the most widely used NSAID on the market. Rimadyl requires a prescription.