How about Metacam?
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Julia (8yo) has a partial tear of her CCL (cranial cruciate ligament (analogous to the anterior cruciate ligament [ACL] in humans) - we took her in for prolotherapy and have been very pleased with the results. We live near the mecca of holistic/alternative therapy (Boulder, CO) and went this route after Julia had trouble with Rimadyl and even anti-inflammatory supplements. Rimadyl just made Julia sick. She would all but stop eating after the 2nd dose. We kept having issues with Julia doing too much Frisbee ... and she would be limping in the morning following a lot of exercise or running in snow, for up to a week following an episode. She would have trouble squatting, or sitting ... and would lay on one hip because she didn't want to bend her knee. Also, she would lean against the wall on one side so that she didn't have to put as much weight on that leg. I was skeptical at first, but now, ~6 months after the prolotherapy injections, she has doing exceptionally well.
My disclaimer: Julia no longer chases the floppy Frisbee (now she has the KONG Air Dog Fetch Stick) , and we rein her in if she starts to get too carried away. Frisbee is just too rough on many dogs - all of the jumping in the air, and hard landing ... if you think about it, it just isn't what dogs were designed to do). As we all know -
just because you can, doesn't mean you should. 