While I was trying to get lunch on the table, the doorbell rang, it was the mail-lady bringing us stuff (yay!). (Mail laidy rawks, and she was petting Dawg and says she always feels bad that Dawg sits sadly and watches her drive away--even though she knows we're home if Dawg is outside--Dawg is very good at the sad eyes).
Apparently, I failed to latch the front door tight (we almost never use it), then left. (we had absurd wind today). Sometime in the next 3 hours, while only the pets were home, it blew open (it doesn't have a screen).
The Mr. got home and 2 cats were freaked out in the living room and Dawg (who loves going out the front door, because it means guests!) was sleeping under the kitchen table.
I've no idea why they didn't all run out and play in traffic, but, yay for everyone being OK. And I've properly dead bolted the door.