I'm a lurker but really need some help with my dog's barking. We have a rescue that we have been loving on for almost 3 years now. She is very smart, well trained in terms of listening to us (sits, heels, stays, comes on command, etc). However, she barks violently when someone enters the door. I know it's more of a protective thing, but we just can't do it with 2 little kids who she will wake from naps and sleep. She also barks at squirrels or dogs that she may see at the windows. How do we go about training her for this. A friend recommended a bark color, but I just don't like the thoughts of that, it doesn't seem fair, but maybe I'm being a whip. Any advice for teaching this old dog some new behavior! TIA!