10 year old maltese (on July 5th), has patella luxation in both back knees. I've been giving him that Glyco-flex 2 for a couple of years. So now he's limping, won't go up and down stairs. Every once in a while I would give him 1/2 of a Prednisone ....last time was a few days ago. Now I have his Novox. will it hurt him to start him on Novox so close to taking Prednisone?