The veterinarian gave this in a prescription form to "Sofie" an older Poodle mix dog that we had. She had gotten unable to jump up on her bed, or run after a ball -- just old age and bad hips. We gave her these and was amazed at the difference it made in her. Now we have a Laso Apso in the same situation. We began giving them to him a couple weeks ago and the difference is already evident. (The vet gave us a prescription by just pasting his label over the manufacturer's bottle -- that is when we discovered that we could buy them for less through a vitamin store.) We have referred several of our friends with older dogs to use this product. Amazing results every time.