I was friends with Alan & Louise Shepard (the astronaut & wife) through a close friend at work in 1996 or so. On a trip to Wimberley, Tx, to visit thier daughter and husband (my friend), they brought a small aging mixed chihuahua with arthritis so bad he could hardly get around. I shared with them, my dad's teachings of giving aging dogs alfalfa tabs crunched up in thier food to help give the joints natural lubrication. In the following weeks I received a letter from Alan & Louise thanking me so much for the tip as their dog was rejuvenated and walking like he had not done in years. Try it, it works. 500- 1500 mg tabs in the food will do it.