Little mischiefs! Soon to be medium mischiefs, then quite large mischiefs by the looks of things.
With your labradors, assuming firm but fair training and some experience of the breed, at what age would you expect them to settle down and become reliable?
We love labs, have had some great times with several really solid dogs over the years, but have also known some complete nutters that drove their owners (and everyone else) mad with frustration...