Austin is just 10 months and really hasn't gone through a bratty stage but he is still very much puppy....however he listens well so not much of a problem there...On the other hand, Lincoln is just 8 months...he still is not permitted to run through the house as he is like a bull in a china shop and while he sleeps in our bedroom with the other dogs, he is on his pillow in an excercise pen. He can also be quite destructive in the yard....he rearranged my plants and trees many times this past summer. However, they're just things and we love him to death, so we just chalk it up to puppyhood!!