I initially tried a sample that my vet provided me for my 11 year old Aussie mix. She was sometimes limping after too much excercise. And her joints always made snaping and popping noises when she would get up. We've been using it now for over 2 years. No more limping after excercise, no more popping from her joints. She gets up and moves much easier when she is taking the suppliment. Highly recommended.