My dog has been on Rimadyl a year now. We started out with 2 pills a day. Then we broke a pill in half & he gets half in the morning & half a night. It has taken the pain away & he is comfortable. He was hit by a vehicle when he was 2 years old & he is 12 years old now. His artheritis is the result of that injury. He also gets plenty of exercise to keep him in good shape. We go out for walkies.