I tried the kennel approach with 2 pups I bought in June. I felt it was a dismal failure when I compared their development with my adult house dog. They didn't listen nearly as well , they seemed to not care whether or not they were pleasing me during training sessions. Thus , I abandoned that idea and now all 3 stay in the house, and the pups are coming along beautifully.
A dog views his master as a God, it is our job to not prove otherwise.