We have a 13 1/2 week old pup, she was pretty quite when we first bought her home and as she adjusted to her new home and her routine she did get a little cheekier and louder

. She is still very sweet and comes for a good cuddle and she sleeps in my sons room while he has his nap, and she also swipes toys from the kids rooms and trots past them with it in her mouth so they will jump up and chase her. When husband is home and playing with her she sounds like she is going to rip his leg off (she's not of course - tail wagging the whole time), mad Boxer burns through the house (this was amusing the first few times). Nothing horrible though, no tales of her destroying the house (and I hope the teen stage does not produce any) - just her personality shining through a little more now. Not an expert so not sure if they all change a little as they get used to their new homes, but this is the case for us.