Auggie (and Payton) are on Glyco-Flex. I compared ingredient numbers and doses and cost and found Glyco-Flex to basically be the best bang for my buck.
Auggie is on the 2, Payton is on the 1. Neither really "need" to be on it, though Auggie is at pretty high risk of developing arthritis in his wrists basically any day now (hence why the 2 instead of the 1) and I know there is some debate about joint supplements as a preventative, but I would personally rather give it than not.
I also like to give salmon oil along with a joint supplements - supposedly it helps to lubricate joints, plus it has a bunch of other health benefits too, heart health, skin and coat...