Java is very easy-going at the dog park, will go up to a total stranger and Doberlean on them asking for lovin'. But get her home and the FedEx guy drives up, and then she is on High Alert. She is also at the back door in a shot if she hears deer in the backyard - anytime the perimeter is breached (sorry couldn't resist) she growls/barks. At least she has stopped barking every time a leaf moves...That natural protectiveness is part of the reason why we got her. (Strangers don't need to know that she spends as much time as she can in my lap.)