There are 4 that I like...glucosamine, chondroitin, MSM, & CBD oil.
To decide when to put mine on such items, I go by several things...age, size, injuries, symptoms, and athleticism.
It doesn't work as well with the oldest dogs, or the worst joint problems, but I've still seen a marked improvement in quality of life, depending on the dog. And, there can he an improvement in the joint when given earlier.
He may well have been playing. Silly boy! :-)
Love All Life, Thank You For Posting! :)