We had a German shepherd who slept right through burglars removing all my dh's Craftsman tools from the garage!
Now we are in a different house and have a home security system. We set the alarm when we leave, disarm when we get home. It actually saved my bacon a couple of weeks ago when I left a pot cooking on the stove; fire alarm went off, and the home security company called me to determine if they needed to send a fire truck, plus talked me through turning off the alarm. Ours is a local company with a good reputation.