My dog Bob has been on Rimadyl over a year now. He will be 14 years old July 4th. We just recently did a vet visit & the vet was amazed at how well he is doing. Herding dogs generally don't live to be that old. There are many side affects it is either the Rimadyl or put him to sleep. You have to use common sense & watch for the side affects. Without the Rimadyl he is in pain. He gets lots of exercise which I think is important. We give him a half pill in the morning & half a pill in the evening.