Also known as ghost walking, a dog will move repeatedly in cartoon-like slow motion under a fringe of leaves or something else that gently tickles their face and back. People speculate why they do this; obviously it feels nice but I think it’s also a form of meditation.
When dogs go into this trance-like state they often don’t immediately come out of it. If your dog trances don’t interrupt them, let them have their special time.
see on imgur: https://imgur.com/gallery/mnk0MJj