Our lab, English chocolate, came from a breeder in northern Louisiana. We had him flowen to Alaska at 10 weeks old. At that time the wife and I were working rotational jobs, 3 on 3 off. I took 9 weeks off work and stayed home with the mutt. I took him outside every hour on a leash, he never had an accident in the house. After awhile he'd fetch the leash when he wanted to go out.
Before I went back to work I found a boarding kennel that also trained labs. The first 6 years of his life he was trained for hunting (retrieving), field trials and discipline. After that we hired a live-in doggy babysitter so he could stay home (it was also cheaper). He very seldom chewed on anything, especially us. Somehow he did learn to take us by the hand in his mouth and lead us to something he wanted, or away from danger. He had a bad experience with one of our old range cows a couple of years ago, so now if there's any cows around he gets nervous and tries to lead us away.