Joint Aid for Dogs is an amazing product.
My chocolate lab is almost 11. At 6 years old she ruptured her archillies tendon - both legs. She had the most amazing surgery in which both legs (sep. ops!) were surgically broken and a piece of bone reversed to form a "brake" at the knee joint.
Her legs are pretty much bionic. As soon as she had made a full recovery from both ops we put her on GWF's Joint Aid and the difference was noticeable.
She has been on it ever since and I know I can increase the dose if need be.
It is marvellous stuff and I see from the leaflet inside the tub there is now a human equivalent