Glucosamine chondroitin and MSM supplement to enhance the joints health of your dogs and cats A specially formulated supplement to help our pet friends to run and play as they wish, with healthy and strong joints. Glucosamine is one of the main constituents of connective tissue which has very important roles in the skeletal systems of pets. It is found in tendons, ligaments, intervertebral discs, cell walls, intra-articular pads, and cartilage tissue.