I had the TV on and Murphy, who never barks unless Molly barks first,  was sleeping soundly upstairs and all of a sudden he jumped up and went bananas barking and barking.  Molly (who never goes upstairs) immediately ran upstairs and started licking me.  It was definitely a different behavior than “someone’s at the door.”  Then, I realized that on TV, a fire alarm was sounding!   I gave them both lots of big praise.  Just another instance of “my dog is smarter that I am.”   Thanks to Liz for doing fire drills with the dogs almost two years ago!!  I had only practiced at home a couple of times, but never realized they picked up on the sound signal too – I was focused on alerting to smoke smell & flames.