My dog Beeker has been on the Annamaet Endure since he turned about 13, that¹s pretty old for a Australian Shepard border collie mix. And now Beeker just celebrated his 16th Birthday! He is quite the old, cranky and hard of hearing pup but he runs plays and can even manage the steep stairs! Thank you so much to everyone at Annamaet for making such an incredible supplement to help my old dog! We¹re going for 17! Gabe K.