Fortunately, a Welsh corgi counts as 2 dogs on a Two-Dog Night because it fits inside your sleeping bag. Ordinarily, I like to sleep with the dogs for companionship and the peaceful vibes that emanate from a snoozing animal. This time, it was for something more primal: body heat.
Dummy here brought a goose down sleeping bag on a 9-day backpacking trip in normal (icky) Cascade weather. What was I THINKING!? I wasn't thinking. Down is useless when wet, and by Night 3, I had a wet bag of wet feathers, often above 6000'. It was not exactly a survival situation, but it was too cold and wet to sleep, and the rain wasn't stopping. In order to continue the trip, we perfected the Two-Dog Night Technique:
Wear every stitch of clothing you have except boots and rain gear (all of it wet or damp, none of it cotton, neck scarf important).
Take the dog's little square foam sleeping pad and shove it up the back of your windbreaker, so your back will have some insulation when you roll to either side.
Lie on your back, with the dog sprawled across your chest. Put the dog's blanket on top of the dog. Zip up the sleeping bag (don't get the dog's whiskers caught in the zipper; don't throw your back out).
Cinch the mummy bag opening down around your respective snouts so you're both breathing outside the bag. This means your respective snouts must be side-by-side. Cozy.
Get your hands under the dog's blanket and bury your cold fingers in its warm pelt.
Then disassemble the entire apparatus and go out and pee. The dog too. Start over.
Relax and succumb to the hypnotic mantra of a sleeping corgi snurzling in your ear. It's better than an electric blanket. Roll to either side as necessary.
Open your eyes; it's dawn already.
WARNING! Do not try this at home, kids! It only works with a totally laid-back dog, like Al. Imagine being trapped inside a mummy bag with a panicked carnivore! [I'm serious.] Works best with a dog who can hold its bladder all night.
Humans have been sleeping with their dogs to keep warm for as long as there have been dogs. You feel a unique bond when you do this for real, for a week.