We have three dogs, two golden retrievers and one "teenage" standard poodle. When they have to go potty in the evenings, we let them out our kitchen door into a large fenced in area. Normally, they go out with me and we walk through the woods for a wonderful time.
The other evening, the three dogs went outside. A few minutes later, I opened the kitchen door and they returned to the house. Or so I thought. About 15 minutes later my husband heard an unusual sound and when he checked, our female golden was still outside, sitting by the door and crying. She doesn't bark. She could have been out there in the snow, wind, and freezing weather all night ... and we know what that would have led to -- and I never ever would have forgiven myself.
My point? If you have more than one dog, count when they come in. They run inside like a blur and you can just assume all of them came in. If you only have one dog (and this works with more than one), set a timer. Use the one on your microwave or an egg timer. Most cell phones now offer a timer that makes a distinct noise when the time is up.
You may think, as I did, that I could never ever forget any of them or fail to notice one less. But you can get distracted by anything: a telephone call, a television show, cooking dinner, you name it.
I was lucky. We did not have a disaster, but it could have easily been one. I hope my experience helps you to keep your pups safe all year long.