Our puppy is 7 months old and we have a problem with her barking at strangers. Anyone who knocks on the front door she will not stop barking at. I used my mums groomer today for the first time and the lady came to pick our dog up. From the second the lady stepped in the puppy was barking and would not shut up! It's so embarrassing because even if you tell her to stop she carries on. This is happening a lot lately and I don't know how I handle this. Anyone got any ideas please?