I have been using the Liquid-Vet Dog Joint Formula for about a year now. My lab frequently gets stiff and sore hips after long runs and hikes. I noticed a visible difference in her after adding this to her food one time! I now add it to her food everyday and she can once again handle our long hikes with ease. It has turned into a must have in my house! A truly great product that will make the world of difference in your pets life.