Xena loves playing this game with herself, I call it Boxer soccer, where she sees one of her toys, runs over to it, jumps on it, kicks it one way, runs back, jumps on it again, picks it up and flings it across the room with her mouth and continues these shenanigans until she's panting. Do any of your boxers do this? When she was still a puppy she also use to do something my mother called the "zoomies." Shed randomly start zooming around the house in a giant circle, jumping on the couch, leaping over furniture. It was as if someone had possessed her body and was forcing her to run in a circle! Calling her name, yelling, screaming....not even standing in her way could stop her. Seem familiar??