and prefer Deramaxx for my dogs due to the liver problems of Rimadyl. Most dogs that have liver problems with Rimadyl do so within a few months. So if yours is doing well on the current dosage then you should continue to give it.

tatsxxx11 brought up an excellent point - make sure your Vet continues to monitor on a monthly basis the liver enzymes. If your dog should suddenly become nauseated, and/or anorexic then promptly withdraw the Rimadyl and head to the Vet.