Tried all 3 - Human, Horse & Canine. The canine product has been unbelievable for my older girls. Both are active but 2 had a slight limp. Noticed the running and jumping had slowed down a bit. Put all 3 girls on the Canine and the transformation has been amazing. The two older girls are unstoppable!! Limp is gone and the visits back on the bed are now a daily activity. Can not say enough good things about the Canine formula!!!! Didnt have quite the same results for this old girl on the human formula and not sure on the horse product. Both boys have few issues so results were much less noticeable. 100% sold on the Canine formula!!! Thanks!