Well it is really called Run Like Hell but some take offense. The Havanese do an amazing job at it with themselves, with others. They know how to expel energy.
It was so windy that you swear Truffie had a flagpole tail but he doesn't. Some Havanese do. It's usual if relaxed, or concerned that their tail doesn't go over the back for those that truly don't have a flagpole tail.
It does help you to understand what is going on. Body language is fun to learn and can teach you so much about what your dawg is saying or how they are feeling.
I know my dawgs so well that I know if something is wrong whether it is being ill, a concern they may have or just plain having mischievous fun.
Today Truffie managed to get his first real mats on his chest and he was giving me the evil eye but without complaint. They are all out now but his first ones since he was born. The snow, the play and the rubbing fun can do that but it's not usually an issue for me as I stay on top of it even if they never have knots as I believe in conditioning them to grooming. It makes your life easier in the long run.