I have a bernese mountain dog, 17 months old. His hips and elbows started looking questionable around 4 months of age, so I started him on stage 1 of these. Within 2 days I saw a difference in his behavior much more bounce and spring and he started jumping for the first time (on us, which we had to teach him otherwise but.....).
4 months later, the store quit carrying this so I switched him to the "newly recommended one" (Activphy). After a week of being off Overby, he started limping, so I called around and found some in another city and went and got it.
5 months ago, I ran out of those and since NO ONE had it on the shelf, I chose ANOTHER supplement from a health food store. This time within 2 days of being off Overby he started limping on his hind leg......and of course, we were out of the country this time. My sister was worried sick she had done something to him (she was watching him), but when I talked to her the limping occured within 2 days of switching him to the health food suplement once the last of the Overby had been given.
I took that expensive and useless stuff back, and then ordered Overby online.
PLEASE keep carrying this stuff!!! It works amazingly well. As long as I can get it, my dog will be on a daily maintenance dose. (In case anyone is wondering,I chose not to neuter my dog so his joints had time to grow. My vet is happier with them now than he was, but we are taking no chances.)

My senior Sheltie has been on a daily regime of the Moderate Care Hip Flex. I praise this product, because not only has this supplement eased the aches and pains of an aging dog, but my dog also really loves the taste. I don't worry about having to dress her meals up, which is a delight. She will eat her supplement with no fuss! Her brewer's yeast always needs fish oil on top, but not her Hip Flex. I have also noticed she is less stiff (this is a year and a half of use). Her limp, which is slight, is unnoticeable most days. I really enjoy this product for my dog and I have seen improvement in her joints and her ability to walk without hitching. I would certainly recommend!