Find a variety of nutritional supplements for your senior dogs, including Pet Tabs®, Glyco-Flex® and more. Supplements can become very important in your dogs old age when they need many nutrients that they might not regularly be getting. Doc Roy's® Aches Away supplements can help strengthen your senior dog's joints & muscles with a key combination of high-level glucosamine, hydrochloride, creatine monohydrate, and methylsulfonylmethane.