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 liver-flavored chewables 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.