So, here's my story. My wife and kids ramrodded a 5 lb. furbag on me last May. Since he's been here he has become more and more territorial. The last time I let someone in the house (my brother) the dog bit him. Now my wife has invited my 17 year old niece to spend the summer with us. I need a way to keep her safe, and would like to find an option that does not include my kids crying their eyes out.
<--Not my dog