Great health starts with great nutrition. Vitapet Double Strength R A Joint Formula for Dogs help maintain pain-free, supple and mobile joints for that healthy, active dog. Nutritionists have laboured extensively to produce hypoallergenic formulae that cater to a dog's overall health and wellbeing. Includes added calcium, which helps to maintain and build cartilage and maintain elasticity and promote healthy movements in joints. Higher glucosamine will benefit older/larger dogs.