A Dog's Paranormal Experience

A few months ago, my husband and i were talking about how our son had this weird affinity for the crying baby. The whole time we've been here, the dogs will randomly get spooked or stare at something that i don't see. A few hours later, i'm listening to a pad cast while working, and i hear a faint mumble that sounded almost like mommy. I turned around to tell him that he needed to go back to his room and not to bother me while i was working. But as i was turning round, i remembered that he wasn't even home. At this point, i tried to brush it off, thinking my mind is playing tricks on me.