Back-to-Back or The Cuddle Bug
If your dog is cuddling up with you, or you notice him sleeping back-to-back with the other dogs in your house, there is a simple reason for that.
Source: Jaw-Dropping Facts/Youtube
The tendency that many dogs need to cuddle when they sleep is a holdover from when they were puppies.
This also has to do with the body heat, since puppies have difficulty regulating their body temperature.
As the dogs mature, sleeping back to back becomes a sort of habit from puppyhood.
If your dog is cuddling up with you, it is an instinctual way for a dog to show that you are like one of the other dogs and they trust you.
