[QUOTE=Skip;721761]Many here advise against using any of the so-called puppy formulas for rotts. Do some searching here on puppy formulas for more info.[/QUOTE]
I agree with Skip. You could be doing much better food wise than Nutro. The amount of gluc./chond in the Nutro is minimal....it's not a theraputic dosage. The company puts it in because "it sounds good".
As far as the OP's question, I think you should add some gluc./chond. supplement if your dog is doing some excessive sport such as agility or something where the joints are exposed to alot of repetitve wear and tear.
If the dog is a pet, going out for a couple of walks per day and playing in the backyard with the ball...I would not bother adding a supplement to a young dogs diet.
Gina