His behaivor is really VERY normal ... My neighbor's rottie is 1 yr 4 months old and he's still just a big puppy.
All of the stuff Ive read says to expect "puppy life" from them for up to 2 years old. (dont shot the messenger) ...
BTW, Chip was in full puppy mode until he was almost four!!! I think Patchs will be about the same!!!