In our house, we have a Border Collie and a Pomeranian-Chihuahua who barks at the door when someone approaches the front door. We have a security system and weapons, and I keep my cellphone in my bedroom at night. In addition, our HOA has security guards who monitor the area by patrolling it and with security cameras (though I haven't seen one in our area). If the alarm goes off and I'm sure it's a burglar, I'll call 911 on my cellphone.