I swear by Arthogen. My vet recommend it because Chrissy was stiff. I have seen a complete turn around in her! She can jump up on the bed and gets up and down the stairs now. (She turns 16 next month!!!) You can find the Arthogen at www.BestPetSupplements.com. They answered all my questions and sent the pills quickly and were cheaper than at the vets office. I hope this helps!