They Look at You in The Eye.
When your pups look at you they’re “hugging you with their eyes.” Hare explains that oxytocin – a chemical released that helps bonding between new mothers and their babies – is also released when dogs play, touch or stare at their owners. That was Brian Hare, director of the Duke Canine Cognition Center said.
They sleep with you.
We’ve all dog owners wake up with a puppy paw in our back or doggie-breath in our face. Dogs in the wild sleep as a pack which is a sign of being loyal. Moreover, when a dog lives with or is good friends with another dog, they want to sleep together too – but only if they are allowed by the other pup. That means that if your dog sleeps with you is because he consideres you as a good friend.