I wasn't sure if these vitamin/minerals will work on our dog, a friend offered a handful, about a week's supply, to give to 11-year-old Pit/Boxer mix. It didn't take long to convince us that each little vitamin is worth its weight in gold. Our old dog, Lady, weighs about 85 pounds. She is lumpy and stiff. After taking these vitamins for a week, she has improved tremendously in her ability to get around as well as her interest in her environment. We believe it is up to us to provide the best life we can for our best four-legged companion, and she shows her appreciation with a good ol' fashion lick on the hand. I highly recommend this product. We are now giving it to our two-year-old mix to help prepare him for his golden years as well as making sure he gets the best out of life right now.