Carprofen (Rimadyl) is a nonsteroidal anti-inflammatory drug (NSAID) used to treat pain and inflammation in dogs, particularly those with osteoarthritis. It works by inhibiting the production of inflammatory chemicals in the body. It is typically used as part of a multimodal approach to managing pain in dogs, alongside weight management, physical therapy, and other medications. Side effects can include gastrointestinal upset, decreased appetite, and in some cases, liver or kidney damage. For this reason, it’s advised for dogs taking carprofen on a long-term basis to have bloodwork done every six months.