Hittman,
I believe in letting the pup bay a good while but always take him out and praise him before he can have a chance to burn out. And don't put him in the pen every day but just enough for the pup to learn how to stop a hog and maybe a tune up every now and then to put hog on his mind.
Boom hit that one on the head. I forgot to include that little jewel of a tip on your young dogs. Superb advice Rueben. Always leave them youngsters wanting more and pulling at the leash. Pay attention to your puppies attention span cause they are all different. If you see the little ones fading rev em up and pull em in the heat of the moment. When I said let em bay until they slober I specifically meant more mature pups not the youngsters. Good you included that.