Well as someone who trains in agility and "trained" the tug drive right out of Max I wouldn't try to extinguish his tug drive. It is a good age to start to teach him that he does need to let go when you ask - but as i said I trained control so well it's taken me a year to build Max's tug drive back up
As far as the barking to play - Rylie does that (he didn't as a pup but does now) and we are very consistent in taking his ball away when he barks at us to throw it. I'm hoping that will eventually extinguish the barking (I call it yelling at me behaviour).
Mindy Tri - Feb/97
Max - Ruby - Sep/08
Rylie - B&T - June/09