i have a 1 ½ yr old Boston Terrier and he is the most loving and friendly dog. If you met him out on the street he would have no problem letting you pet him etc but when it comes to being territorial of the home it’s a totally different story. He is VERY aggressive when deliveries arrive and guests who he’s never met come round. He is such a great dog but this one problem stresses me out so much. I’ve had advice from many people saying “that’s just how he is” or “that’s how Boston’s are” but I would really like to know if anyone has advice on how to stop this behaviour.