My toy Fox Terrier will be 15 next month. I've been giving him Ultimate Pet Nutrition daily in his food for over 3 years now, and he is not only completely healthy, he still acts like a puppy--doing zoomies, playing fetch, taking long walks outdoors, jumping up and down from high furniture, etc. Ultimate Pet Nutrition is a keeper! By the way, since my dog weighs only 7.5 pounds, I give him a third of a scoop, since one scoop will cover up to a 25-lb. Dog.