Sounds good to me. As long as the dog is not experiencing any unpleasant side effects.
I am not aware of any supplement that could come close.
http://www.metacamfordogs.com/ excerpt below.
Metacam© is a nonsteroidal anti-inflammatory drug (NSAID). Metacam works by reducing hormones that cause pain and inflammation in the body. Metacam is used to reduce pain, inflammation and stiffness as a result of acute and chronic musculoskeletal disorders such as osteoarthritis.
For: Dogs (over the age of 6 months)
Benefits:
Effectively treats pain and inflammation for up to 24 hours
Gives your dog more mobility
Comes with a graduated syringe, with weight measurements, that easily and accurately dispenses the correct amount of oral suspension
Can be administered directly into your dog’s mouth, or mixed in your dog’s food
