Sasha's Blend joint supplement since I took Max to Say Yes puppy camp when he was about 15 months old. I will confess that my reason for using it was very unscientific. Susan Garrett uses it for her dogs from the time they are puppies. Even though my vet felt there was no evidence that using a supplement preventatively will do any good he also didn't think it would do any harm. I ask my dogs to do a lot of jumping and I want to keep them them healthy. I use this instead of the glucosamine chondroitin that I had been giving them. Of course it seemed only fair to give it to Mindy as well (she was 11 1/2 and although she didn't show any symptoms of stiffness or pain I figured it wouldn't hurt). When I ran out of the first batch I didn't reorder right away. What I noticed was that Mindy was a bit slower to get up out of bed and didn't move with quite as much pep. That sold me on using the Sasha's blend and I've used it ever since.