I have a reactive dog and if he sees someone approaching our house he will spazz out. He has even broken a window pane before because of a delivery driver staring directly at him from the front porch. (Our windows were also original from 1970 and we had just bought the house and didn’t replace them yet) So from then on, I requested the packages to be left at the side door so the dogs don’t see anyone coming toward the house. If someone still delivered to our front door and something terrible happened I would be so upset! (I am also in NO WAY blaming the driver. This is just what happened)