Simba is 1.5 yr old now (almost) and weighs 78 to 80 lbs. He is very healthy, his parents, grandparents are all very healthy too. I want to add some sort of glucosamine and MSM to his diet as supplements. I have been researching Glyco Flex (confused on the I, II and III) and Dasuquin. Any thoughts on what to start giving him?