I have had two Olde English Sheepdogs. First girl Sophie was wise beyond her years; so super intelligent and eager to please. Her successor, Maggie was nothing but an idiot too. Used to refer to her as my ditzy blonde. She wasn't worth a hoot until she was three, finally calming down and listening. Remained very flaky the rest of her life but she was unwaveringly loyal and a happy, friendly girl. Hang in there, your teen will come around.