I have a 5 yr old MN Lab that has a history of thoracic IVDD that was treated with surgery in 11/06. He still seemed guarded around his back and had decreased energy. The owner came to see me in November 2008 and I put him on Standard Process Ligaplex and your Supple Spine product--2 tabs BID. He is much better, more energetic, no longer urinating in his cage and less painful. I couldn't seem to find how long I should keep him on the Supple Spine since he is doing so well. Is there a general rule? I know Four Marvels and others are safe for long term use, but not sure about this one.